enhance: record memory size (uncompressed) item for index (#38770)

issue: #38715

- Current milvus use a serialized index size(compressed) for estimate
resource for loading.
- Add a new field `MemSize` (before compressing) for index to estimate
resource.

---------

Signed-off-by: chyezh <chyezh@outlook.com>

cmd/tools/migration/meta/210_to_220.go

@@ -264,7 +264,7 @@ func combineToSegmentIndexesMeta220(segmentIndexes SegmentIndexesMeta210, indexB
 				IsDeleted:           buildMeta.GetMarkDeleted(),
 				CreatedUTCTime:      record.GetCreateTime(),
 				IndexFileKeys:       fileKeys,
-				IndexSize:      buildMeta.GetSerializeSize(),
+				IndexSerializedSize: buildMeta.GetSerializeSize(),
 				WriteHandoff:        buildMeta.GetState() == commonpb.IndexState_Finished,
 			}
 			segmentIndexModels.AddRecord(segID, indexID, segmentIndexModel)

internal/core/src/common/protobuf_utils.cpp

@@ -0,0 +1,45 @@
+// Copyright (C) 2019-2020 Zilliz. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the License
+// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+// or implied. See the License for the specific language governing permissions and limitations under the License
+
+#include "common/protobuf_utils.h"
+#include "common/protobuf_utils_c.h"
+
+// Make a static_assert to ensure that the size and alignment of the C++ and C
+static_assert(
+    sizeof(milvus::ProtoLayout) == sizeof(ProtoLayout),
+    "Size of milvus::ProtoLayout is not equal to size of ProtoLayoutInterface");
+
+// Make a static_assert to ensure that the size and alignment of the C++ and C
+static_assert(alignof(milvus::ProtoLayout) == alignof(ProtoLayout),
+              "Alignment of milvus::ProtoLayout is not equal to alignment of "
+              "ProtoLayoutInterface");
+
+ProtoLayoutInterface
+CreateProtoLayout() {
+    auto ptr = new milvus::ProtoLayout();
+    return reinterpret_cast<ProtoLayoutInterface>(ptr);
+}
+
+void
+ReleaseProtoLayout(ProtoLayoutInterface proto) {
+    delete reinterpret_cast<milvus::ProtoLayout*>(proto);
+}
+
+namespace milvus {
+ProtoLayout::ProtoLayout() : blob_(nullptr), size_(0) {
+}
+
+ProtoLayout::~ProtoLayout() {
+    if (blob_ != nullptr) {
+        delete[] static_cast<uint8_t*>(blob_);
+    }
+}
+}  // namespace milvus

internal/core/src/common/protobuf_utils.h

@@ -38,4 +38,46 @@ RepeatedKeyValToMap(
     }
     return mapping;
 }
+
+class ProtoLayout;
+using ProtoLayoutPtr = std::unique_ptr<ProtoLayout>;
+
+// ProtoLayout is a c++ type for esaier resource management at C-side.
+// It's always keep same memory layout with ProtoLayout at C side for cgo call.
+class ProtoLayout {
+ public:
+    ProtoLayout();
+
+    ProtoLayout(const ProtoLayout&) = delete;
+
+    ProtoLayout(ProtoLayout&&) = delete;
+
+    ProtoLayout&
+    operator=(const ProtoLayout&) = delete;
+
+    ProtoLayout&
+    operator=(ProtoLayout&&) = delete;
+
+    ~ProtoLayout();
+
+    // Serialize the proto into bytes and hold it in the layout.
+    // Return false if failure.
+    template <typename T>
+    bool
+    SerializeAndHoldProto(T& proto) {
+        if (blob_ != nullptr || size_ != 0) {
+            throw std::runtime_error(
+                "ProtoLayout should always be empty "
+                "before calling SerializeAndHoldProto");
+        }
+        size_ = proto.ByteSizeLong();
+        blob_ = new uint8_t[size_];
+        return proto.SerializeToArray(blob_, size_);
+    }
+
+ private:
+    void* blob_;
+    size_t size_;
+};
+
 }  //namespace milvus

internal/core/src/common/protobuf_utils_c.h

@@ -0,0 +1,40 @@
+// Copyright (C) 2019-2020 Zilliz. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the License
+// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+// or implied. See the License for the specific language governing permissions and limitations under the License
+
+#pragma once
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ProtoLayout is a common ffi type for cgo call with serialized protobuf message.
+// It's always keep same memory layout with milvus::ProtoLayout at C++ side.
+typedef struct ProtoLayout {
+    void* blob;
+    size_t size;
+} ProtoLayout;
+
+// ProtoLayoutInterface is the pointer alias for ProtoLayout.
+// It should always created by CreateProtoLayout and released by ReleaseProtoLayout.
+typedef struct ProtoLayout* ProtoLayoutInterface;
+
+// CreateProtoLayout is used to create an empty ProtoLayout.
+// When you want to create a ProtoLayout at go-side, and return some data from C-side.
+// You should use this API.
+ProtoLayoutInterface
+CreateProtoLayout();
+
+void
+ReleaseProtoLayout(ProtoLayoutInterface proto);
+
+#ifdef __cplusplus
+}
+
+#endif

internal/core/src/index/BitmapIndex.cpp

@@ -286,18 +286,15 @@ BitmapIndex<T>::Serialize(const Config& config) {
 }
 
 template <typename T>
-BinarySet
+IndexStatsPtr
 BitmapIndex<T>::Upload(const Config& config) {
     auto binary_set = Serialize(config);
 
     file_manager_->AddFile(binary_set);
 
     auto remote_path_to_size = file_manager_->GetRemotePathsToFileSize();
-    BinarySet ret;
+    return IndexStats::NewFromSizeMap(file_manager_->GetAddedTotalMemSize(),
-    for (auto& file : remote_path_to_size) {
+                                      remote_path_to_size);
-        ret.Append(file.first, nullptr, file.second);
-    }
-    return ret;
 }
 
 template <typename T>

internal/core/src/index/BitmapIndex.h

@@ -114,7 +114,7 @@ class BitmapIndex : public ScalarIndex<T> {
         return Count();
     }
 
-    BinarySet
+    IndexStatsPtr
     Upload(const Config& config = {}) override;
 
     const bool

internal/core/src/index/HybridScalarIndex.cpp

@@ -298,7 +298,7 @@ HybridScalarIndex<T>::SerializeIndexType() {
 }
 
 template <typename T>
-BinarySet
+IndexStatsPtr
 HybridScalarIndex<T>::Upload(const Config& config) {
     auto internal_index = GetInternalIndex();
     auto index_ret = internal_index->Upload(config);
@@ -306,9 +306,9 @@ HybridScalarIndex<T>::Upload(const Config& config) {
     auto index_type_ret = SerializeIndexType();
 
     for (auto& [key, value] : index_type_ret.binary_map_) {
-        index_ret.Append(key, value);
+        index_ret->AppendSerializedIndexFileInfo(
+            SerializedIndexFileInfo(key, value->size));
     }
-
     return index_ret;
 }
 

internal/core/src/index/HybridScalarIndex.h

@@ -153,7 +153,7 @@ class HybridScalarIndex : public ScalarIndex<T> {
         return internal_index_->HasRawData();
     }
 
-    BinarySet
+    IndexStatsPtr
     Upload(const Config& config = {}) override;
 
  private:

internal/core/src/index/Index.h

@@ -26,6 +26,7 @@
 #include "common/Tracer.h"
 #include "common/Types.h"
 #include "index/Meta.h"
+#include "index/IndexStats.h"
 
 namespace milvus::index {
 
@@ -57,7 +58,7 @@ class IndexBase {
     virtual int64_t
     Count() = 0;
 
-    virtual BinarySet
+    virtual IndexStatsPtr
     Upload(const Config& config = {}) = 0;
 
     virtual const bool

internal/core/src/index/IndexStats.cpp

@@ -0,0 +1,81 @@
+// Copyright (C) 2019-2020 Zilliz. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the License
+// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+// or implied. See the License for the specific language governing permissions and limitations under the License
+
+#include "index/IndexStats.h"
+
+namespace milvus::index {
+
+IndexStatsPtr
+IndexStats::NewFromSizeMap(int64_t mem_size,
+                           std::map<std::string, int64_t>& index_size_map) {
+    std::vector<SerializedIndexFileInfo> serialized_index_infos;
+    serialized_index_infos.reserve(index_size_map.size());
+    for (auto& file : index_size_map) {
+        serialized_index_infos.emplace_back(file.first, file.second);
+    }
+    return IndexStats::New(mem_size, std::move(serialized_index_infos));
+}
+
+IndexStatsPtr
+IndexStats::New(int64_t mem_size,
+                std::vector<SerializedIndexFileInfo>&& serialized_index_infos) {
+    return std::unique_ptr<IndexStats>(
+        new IndexStats(mem_size, std::move(serialized_index_infos)));
+}
+
+IndexStats::IndexStats(
+    int64_t mem_size,
+    std::vector<SerializedIndexFileInfo>&& serialized_index_infos)
+    : mem_size_(mem_size), serialized_index_infos_(serialized_index_infos) {
+}
+
+void
+IndexStats::AppendSerializedIndexFileInfo(SerializedIndexFileInfo&& info) {
+    serialized_index_infos_.push_back(std::move(info));
+}
+
+void
+IndexStats::SerializeAt(milvus::ProtoLayout* layout) {
+    milvus::proto::cgo::IndexStats result;
+    result.set_mem_size(mem_size_);
+    for (auto& info : serialized_index_infos_) {
+        auto serialized_info = result.add_serialized_index_infos();
+        serialized_info->set_file_name(info.file_name);
+        serialized_info->set_file_size(info.file_size);
+    }
+    AssertInfo(layout->SerializeAndHoldProto(result),
+               "marshal IndexStats failed");
+}
+
+std::vector<std::string>
+IndexStats::GetIndexFiles() const {
+    std::vector<std::string> files;
+    for (auto& info : serialized_index_infos_) {
+        files.push_back(info.file_name);
+    }
+    return files;
+}
+
+int64_t
+IndexStats::GetMemSize() const {
+    return mem_size_;
+}
+
+int64_t
+IndexStats::GetSerializedSize() const {
+    int64_t size = 0;
+    for (auto& info : serialized_index_infos_) {
+        size += info.file_size;
+    }
+    return size;
+}
+
+}  // namespace milvus::index

internal/core/src/index/IndexStats.h

@@ -0,0 +1,80 @@
+// Copyright (C) 2019-2020 Zilliz. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the License
+// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+// or implied. See the License for the specific language governing permissions and limitations under the License
+
+#pragma once
+
+#include <string>
+#include <vector>
+#include "common/protobuf_utils.h"
+#include "pb/cgo_msg.pb.h"
+
+namespace milvus::index {
+
+class SerializedIndexFileInfo {
+ public:
+    SerializedIndexFileInfo(const std::string& file_name, int64_t file_size)
+        : file_name(file_name), file_size(file_size) {
+    }
+
+    std::string file_name;
+    int64_t file_size;
+};
+
+class IndexStats;
+
+using IndexStatsPtr = std::unique_ptr<IndexStats>;
+
+class IndexStats {
+ public:
+    static IndexStatsPtr
+    NewFromSizeMap(int64_t mem_size,
+                   std::map<std::string, int64_t>& index_size_map);
+
+    // Create a new IndexStats instance.
+    static IndexStatsPtr
+    New(int64_t mem_size,
+        std::vector<SerializedIndexFileInfo>&& serialized_index_infos);
+
+    IndexStats(const IndexStats&) = delete;
+
+    IndexStats(IndexStats&&) = delete;
+
+    IndexStats&
+    operator=(const IndexStats&) = delete;
+
+    IndexStats&
+    operator=(IndexStats&&) = delete;
+
+    // Append a new serialized index file info into the result.
+    void
+    AppendSerializedIndexFileInfo(SerializedIndexFileInfo&& info);
+
+    // Serialize the result into the target proto layout.
+    void
+    SerializeAt(milvus::ProtoLayout* layout);
+
+    std::vector<std::string>
+    GetIndexFiles() const;
+
+    int64_t
+    GetMemSize() const;
+
+    int64_t
+    GetSerializedSize() const;
+
+ private:
+    IndexStats(int64_t mem_size,
+               std::vector<SerializedIndexFileInfo>&& serialized_index_infos);
+
+    int64_t mem_size_;
+    std::vector<SerializedIndexFileInfo> serialized_index_infos_;
+};
+}  // namespace milvus::index

internal/core/src/index/InvertedIndexTantivy.cpp

@@ -136,7 +136,7 @@ InvertedIndexTantivy<T>::Serialize(const Config& config) {
 }
 
 template <typename T>
-BinarySet
+IndexStatsPtr
 InvertedIndexTantivy<T>::Upload(const Config& config) {
     finish();
 
@@ -156,20 +156,25 @@ InvertedIndexTantivy<T>::Upload(const Config& config) {
         }
     }
 
-    BinarySet ret;
-
     auto remote_paths_to_size = disk_file_manager_->GetRemotePathsToFileSize();
-    for (auto& file : remote_paths_to_size) {
+
-        ret.Append(file.first, nullptr, file.second);
-    }
     auto binary_set = Serialize(config);
     mem_file_manager_->AddFile(binary_set);
     auto remote_mem_path_to_size =
         mem_file_manager_->GetRemotePathsToFileSize();
-    for (auto& file : remote_mem_path_to_size) {
+
-        ret.Append(file.first, nullptr, file.second);
+    std::vector<SerializedIndexFileInfo> index_files;
+    index_files.reserve(remote_paths_to_size.size() +
+                        remote_mem_path_to_size.size());
+    for (auto& file : remote_paths_to_size) {
+        index_files.emplace_back(file.first, file.second);
     }
-    return ret;
+    for (auto& file : remote_mem_path_to_size) {
+        index_files.emplace_back(file.first, file.second);
+    }
+    return IndexStats::New(mem_file_manager_->GetAddedTotalMemSize() +
+                               disk_file_manager_->GetAddedTotalFileSize(),
+                           std::move(index_files));
 }
 
 template <typename T>

internal/core/src/index/InvertedIndexTantivy.h

@@ -89,7 +89,7 @@ class InvertedIndexTantivy : public ScalarIndex<T> {
     BinarySet
     Serialize(const Config& config) override;
 
-    BinarySet
+    IndexStatsPtr
     Upload(const Config& config = {}) override;
 
     /*

internal/core/src/index/ScalarIndexSort.cpp

@@ -151,18 +151,14 @@ ScalarIndexSort<T>::Serialize(const Config& config) {
 }
 
 template <typename T>
-BinarySet
+IndexStatsPtr
 ScalarIndexSort<T>::Upload(const Config& config) {
     auto binary_set = Serialize(config);
     file_manager_->AddFile(binary_set);
 
     auto remote_paths_to_size = file_manager_->GetRemotePathsToFileSize();
-    BinarySet ret;
+    return IndexStats::NewFromSizeMap(file_manager_->GetAddedTotalMemSize(),
-    for (auto& file : remote_paths_to_size) {
+                                      remote_paths_to_size);
-        ret.Append(file.first, nullptr, file.second);
-    }
-
-    return ret;
 }
 
 template <typename T>

internal/core/src/index/ScalarIndexSort.h

@@ -90,7 +90,7 @@ class ScalarIndexSort : public ScalarIndex<T> {
         return (int64_t)data_.size();
     }
 
-    BinarySet
+    IndexStatsPtr
     Upload(const Config& config = {}) override;
 
     const bool

internal/core/src/index/StringIndexMarisa.cpp

@@ -174,18 +174,14 @@ StringIndexMarisa::Serialize(const Config& config) {
     return res_set;
 }
 
-BinarySet
+IndexStatsPtr
 StringIndexMarisa::Upload(const Config& config) {
     auto binary_set = Serialize(config);
     file_manager_->AddFile(binary_set);
 
     auto remote_paths_to_size = file_manager_->GetRemotePathsToFileSize();
-    BinarySet ret;
+    return IndexStats::NewFromSizeMap(file_manager_->GetAddedTotalMemSize(),
-    for (auto& file : remote_paths_to_size) {
+                                      remote_paths_to_size);
-        ret.Append(file.first, nullptr, file.second);
-    }
-
-    return ret;
 }
 
 void

internal/core/src/index/StringIndexMarisa.h

@@ -92,7 +92,7 @@ class StringIndexMarisa : public StringIndex {
     std::optional<std::string>
     Reverse_Lookup(size_t offset) const override;
 
-    BinarySet
+    IndexStatsPtr
     Upload(const Config& config = {}) override;
 
     const bool

internal/core/src/index/TextMatchIndex.cpp

@@ -78,7 +78,7 @@ TextMatchIndex::TextMatchIndex(const storage::FileManagerContext& ctx)
     d_type_ = TantivyDataType::Text;
 }
 
-BinarySet
+IndexStatsPtr
 TextMatchIndex::Upload(const Config& config) {
     finish();
 
@@ -98,21 +98,25 @@ TextMatchIndex::Upload(const Config& config) {
         }
     }
 
-    BinarySet ret;
-
     auto remote_paths_to_size = disk_file_manager_->GetRemotePathsToFileSize();
-    for (auto& file : remote_paths_to_size) {
+
-        ret.Append(file.first, nullptr, file.second);
-    }
     auto binary_set = Serialize(config);
     mem_file_manager_->AddFile(binary_set);
     auto remote_mem_path_to_size =
         mem_file_manager_->GetRemotePathsToFileSize();
-    for (auto& file : remote_mem_path_to_size) {
-        ret.Append(file.first, nullptr, file.second);
-    }
 
-    return ret;
+    std::vector<SerializedIndexFileInfo> index_files;
+    index_files.reserve(remote_paths_to_size.size() +
+                        remote_mem_path_to_size.size());
+    for (auto& file : remote_paths_to_size) {
+        index_files.emplace_back(file.first, file.second);
+    }
+    for (auto& file : remote_mem_path_to_size) {
+        index_files.emplace_back(file.first, file.second);
+    }
+    return IndexStats::New(mem_file_manager_->GetAddedTotalMemSize() +
+                               disk_file_manager_->GetAddedTotalFileSize(),
+                           std::move(index_files));
 }
 
 void

internal/core/src/index/TextMatchIndex.h

@@ -15,6 +15,7 @@
 #include <boost/filesystem.hpp>
 
 #include "index/InvertedIndexTantivy.h"
+#include "index/IndexStats.h"
 
 namespace milvus::index {
 
@@ -39,7 +40,7 @@ class TextMatchIndex : public InvertedIndexTantivy<std::string> {
     explicit TextMatchIndex(const storage::FileManagerContext& ctx);
 
  public:
-    BinarySet
+    IndexStatsPtr
     Upload(const Config& config) override;
 
     void

internal/core/src/index/VectorDiskIndex.cpp

@@ -115,7 +115,7 @@ VectorDiskAnnIndex<T>::Load(milvus::tracer::TraceContext ctx,
 }
 
 template <typename T>
-BinarySet
+IndexStatsPtr
 VectorDiskAnnIndex<T>::Upload(const Config& config) {
     BinarySet ret;
     auto stat = index_.Serialize(ret);
@@ -124,11 +124,8 @@ VectorDiskAnnIndex<T>::Upload(const Config& config) {
                   "failed to serialize index, " + KnowhereStatusString(stat));
     }
     auto remote_paths_to_size = file_manager_->GetRemotePathsToFileSize();
-    for (auto& file : remote_paths_to_size) {
+    return IndexStats::NewFromSizeMap(file_manager_->GetAddedTotalFileSize(),
-        ret.Append(file.first, nullptr, file.second);
+                                      remote_paths_to_size);
-    }
-
-    return ret;
 }
 
 template <typename T>

internal/core/src/index/VectorDiskIndex.h

@@ -46,7 +46,7 @@ class VectorDiskAnnIndex : public VectorIndex {
         return binary_set;
     }
 
-    BinarySet
+    IndexStatsPtr
     Upload(const Config& config = {}) override;
 
     int64_t

internal/core/src/index/VectorMemIndex.cpp

@@ -92,18 +92,14 @@ VectorMemIndex<T>::VectorIterators(const milvus::DatasetPtr dataset,
 }
 
 template <typename T>
-BinarySet
+IndexStatsPtr
 VectorMemIndex<T>::Upload(const Config& config) {
     auto binary_set = Serialize(config);
     file_manager_->AddFile(binary_set);
 
     auto remote_paths_to_size = file_manager_->GetRemotePathsToFileSize();
-    BinarySet ret;
+    return IndexStats::NewFromSizeMap(file_manager_->GetAddedTotalMemSize(),
-    for (auto& file : remote_paths_to_size) {
+                                      remote_paths_to_size);
-        ret.Append(file.first, nullptr, file.second);
-    }
-
-    return ret;
 }
 
 template <typename T>

internal/core/src/index/VectorMemIndex.h

@@ -78,7 +78,7 @@ class VectorMemIndex : public VectorIndex {
     std::unique_ptr<const knowhere::sparse::SparseRow<float>[]>
     GetSparseVector(const DatasetPtr dataset) const override;
 
-    BinarySet
+    IndexStatsPtr
     Upload(const Config& config = {}) override;
 
     knowhere::expected<std::vector<knowhere::IndexNode::IteratorPtr>>

internal/core/src/indexbuilder/IndexCreatorBase.h

@@ -13,6 +13,7 @@
 
 #include <memory>
 #include "common/Types.h"
+#include "index/Index.h"
 #include "storage/FileManager.h"
 
 namespace milvus::indexbuilder {
@@ -33,7 +34,7 @@ class IndexCreatorBase {
     virtual void
     Load(const milvus::BinarySet&) = 0;
 
-    virtual BinarySet
+    virtual index::IndexStatsPtr
     Upload() = 0;
 };
 

internal/core/src/indexbuilder/ScalarIndexCreator.cpp

@@ -63,7 +63,7 @@ ScalarIndexCreator::index_type() {
     return index_type_;
 }
 
-BinarySet
+index::IndexStatsPtr
 ScalarIndexCreator::Upload() {
     return index_->Upload();
 }

internal/core/src/indexbuilder/ScalarIndexCreator.h

@@ -38,7 +38,7 @@ class ScalarIndexCreator : public IndexCreatorBase {
     void
     Load(const milvus::BinarySet&) override;
 
-    BinarySet
+    index::IndexStatsPtr
     Upload() override;
 
  private:

internal/core/src/indexbuilder/VecIndexCreator.cpp

@@ -84,7 +84,7 @@ VecIndexCreator::Query(const milvus::DatasetPtr& dataset,
     return search_result;
 }
 
-BinarySet
+index::IndexStatsPtr
 VecIndexCreator::Upload() {
     return index_->Upload();
 }

internal/core/src/indexbuilder/VecIndexCreator.h

@@ -58,7 +58,7 @@ class VecIndexCreator : public IndexCreatorBase {
           const SearchInfo& search_info,
           const BitsetView& bitset);
 
-    BinarySet
+    index::IndexStatsPtr
     Upload() override;
 
  public:

internal/core/src/indexbuilder/index_c.cpp

@@ -238,7 +238,7 @@ CreateIndex(CIndex* res_index,
 }
 
 CStatus
-BuildTextIndex(CBinarySet* c_binary_set,
+BuildTextIndex(ProtoLayoutInterface result,
                const uint8_t* serialized_build_index_info,
                const uint64_t len) {
     try {
@@ -286,9 +286,9 @@ BuildTextIndex(CBinarySet* c_binary_set,
             "milvus_tokenizer",
             field_schema.get_analyzer_params().c_str());
         index->Build(config);
-        auto binary =
+        auto create_index_result = index->Upload(config);
-            std::make_unique<knowhere::BinarySet>(index->Upload(config));
+        create_index_result->SerializeAt(
-        *c_binary_set = binary.release();
+            reinterpret_cast<milvus::ProtoLayout*>(result));
         auto status = CStatus();
         status.error_code = Success;
         status.error_msg = "";
@@ -776,7 +776,7 @@ AppendIndexStorageInfo(CBuildIndexInfo c_build_index_info,
 }
 
 CStatus
-SerializeIndexAndUpLoad(CIndex index, CBinarySet* c_binary_set) {
+SerializeIndexAndUpLoad(CIndex index, ProtoLayoutInterface result) {
     auto status = CStatus();
     try {
         AssertInfo(
@@ -784,9 +784,9 @@ SerializeIndexAndUpLoad(CIndex index, CBinarySet* c_binary_set) {
             "failed to serialize index to binary set, passed index was null");
         auto real_index =
             reinterpret_cast<milvus::indexbuilder::IndexCreatorBase*>(index);
-        auto binary =
+        auto create_index_result = real_index->Upload();
-            std::make_unique<knowhere::BinarySet>(real_index->Upload());
+        create_index_result->SerializeAt(
-        *c_binary_set = binary.release();
+            reinterpret_cast<milvus::ProtoLayout*>(result));
         status.error_code = Success;
         status.error_msg = "";
     } catch (std::exception& e) {

internal/core/src/indexbuilder/index_c.h

@@ -17,6 +17,7 @@ extern "C" {
 
 #include <stdint.h>
 #include "common/type_c.h"
+#include "common/protobuf_utils_c.h"
 #include "common/binary_set_c.h"
 #include "indexbuilder/type_c.h"
 
@@ -36,7 +37,7 @@ CStatus
 DeleteIndex(CIndex index);
 
 CStatus
-BuildTextIndex(CBinarySet* c_binary_set,
+BuildTextIndex(ProtoLayoutInterface c_binary_set,
                const uint8_t* serialized_build_index_info,
                const uint64_t len);
 
@@ -131,7 +132,7 @@ AppendOptionalFieldDataPath(CBuildIndexInfo c_build_index_info,
                             const char* c_file_path);
 
 CStatus
-SerializeIndexAndUpLoad(CIndex index, CBinarySet* c_binary_set);
+SerializeIndexAndUpLoad(CIndex index, ProtoLayoutInterface result);
 
 CStatus
 AppendIndexStorageInfo(CBuildIndexInfo c_build_index_info,

internal/core/src/segcore/Types.h

@@ -47,7 +47,10 @@ struct LoadIndexInfo {
     int64_t index_store_version;
     IndexVersion index_engine_version;
     proto::schema::FieldSchema schema;
-    int64_t index_size;
+    int64_t index_size;  // It's the size of index file before compressing
+        // (aka. the filesize before loading operation at knowhere),
+        // because the uncompressed-index-file-size may not be stored at previous milvus.
+        // so the size may be not accurate (generated by the compressed-index-file-size multiplied with a compress-ratio)
 };
 
 }  // namespace milvus::segcore

internal/core/src/storage/DiskFileManagerImpl.cpp

@@ -94,6 +94,7 @@ DiskFileManagerImpl::AddFile(const std::string& file) noexcept {
 
     auto fileName = GetFileName(file);
     auto fileSize = local_chunk_manager->Size(file);
+    added_total_file_size_ += fileSize;
 
     std::vector<std::string> batch_remote_files;
     std::vector<int64_t> remote_file_sizes;
@@ -146,6 +147,7 @@ DiskFileManagerImpl::AddTextLog(const std::string& file) noexcept {
 
     auto fileName = GetFileName(file);
     auto fileSize = local_chunk_manager->Size(file);
+    added_total_file_size_ += fileSize;
 
     std::vector<std::string> batch_remote_files;
     std::vector<int64_t> remote_file_sizes;

internal/core/src/storage/DiskFileManagerImpl.h

@@ -110,6 +110,11 @@ class DiskFileManagerImpl : public FileManagerImpl {
         return GetRemoteIndexObjectPrefix();
     }
 
+    size_t
+    GetAddedTotalFileSize() const {
+        return added_total_file_size_;
+    }
+
  private:
     int64_t
     GetIndexBuildId() {
@@ -131,6 +136,8 @@ class DiskFileManagerImpl : public FileManagerImpl {
 
     // remote file path
     std::map<std::string, int64_t> remote_paths_to_size_;
+
+    size_t added_total_file_size_ = 0;
 };
 
 using DiskANNFileManagerImplPtr = std::shared_ptr<DiskFileManagerImpl>;

internal/core/src/storage/MemFileManagerImpl.cpp

@@ -73,6 +73,7 @@ MemFileManagerImpl::AddFile(const BinarySet& binary_set) {
         slice_sizes.emplace_back(iter->second->size);
         slice_names.emplace_back(remotePrefix + "/" + iter->first);
         batch_size += iter->second->size;
+        added_total_mem_size_ += iter->second->size;
     }
 
     if (data_slices.size() > 0) {

internal/core/src/storage/MemFileManagerImpl.h

@@ -64,9 +64,16 @@ class MemFileManagerImpl : public FileManagerImpl {
         return remote_paths_to_size_;
     }
 
+    size_t
+    GetAddedTotalMemSize() const {
+        return added_total_mem_size_;
+    }
+
  private:
     // remote file path
     std::map<std::string, int64_t> remote_paths_to_size_;
+
+    size_t added_total_mem_size_ = 0;
 };
 
 using MemFileManagerImplPtr = std::shared_ptr<MemFileManagerImpl>;

internal/core/unittest/test_array_bitmap_index.cpp

@@ -236,10 +236,12 @@ class ArrayBitmapIndexTest : public testing::Test {
                     DataType::ARRAY, config, ctx);
             build_index->Build();
 
-            auto binary_set = build_index->Upload();
+            auto create_index_result = build_index->Upload();
-            for (const auto& [key, _] : binary_set.binary_map_) {
+            auto memSize = create_index_result->GetMemSize();
-                index_files.push_back(key);
+            auto serializedSize = create_index_result->GetSerializedSize();
-            }
+            ASSERT_GT(memSize, 0);
+            ASSERT_GT(serializedSize, 0);
+            index_files = create_index_result->GetIndexFiles();
         }
 
         index::CreateIndexInfo index_info{};

internal/core/unittest/test_bitmap_index.cpp

@@ -134,7 +134,6 @@ class BitmapIndexTest : public testing::Test {
             log_path, serialized_bytes.data(), serialized_bytes.size());
 
         storage::FileManagerContext ctx(field_meta, index_meta, chunk_manager_);
-        std::vector<std::string> index_files;
 
         Config config;
         config["index_type"] = milvus::index::BITMAP_INDEX_TYPE;
@@ -145,10 +144,12 @@ class BitmapIndexTest : public testing::Test {
                 type_, config, ctx);
         build_index->Build();
 
-        auto binary_set = build_index->Upload();
+        auto create_index_result = build_index->Upload();
-        for (const auto& [key, _] : binary_set.binary_map_) {
+        auto memSize = create_index_result->GetMemSize();
-            index_files.push_back(key);
+        auto serializedSize = create_index_result->GetSerializedSize();
-        }
+        ASSERT_GT(memSize, 0);
+        ASSERT_GT(serializedSize, 0);
+        auto index_files = create_index_result->GetIndexFiles();
 
         index::CreateIndexInfo index_info{};
         index_info.index_type = milvus::index::BITMAP_INDEX_TYPE;

internal/core/unittest/test_hybrid_index.cpp

@@ -149,10 +149,12 @@ class HybridIndexTestV1 : public testing::Test {
                     type_, config, ctx);
             build_index->Build();
 
-            auto binary_set = build_index->Upload();
+            auto create_index_result = build_index->Upload();
-            for (const auto& [key, _] : binary_set.binary_map_) {
+            auto memSize = create_index_result->GetMemSize();
-                index_files.push_back(key);
+            auto serializedSize = create_index_result->GetSerializedSize();
-            }
+            ASSERT_GT(memSize, 0);
+            ASSERT_GT(serializedSize, 0);
+            index_files = create_index_result->GetIndexFiles();
         }
 
         index::CreateIndexInfo index_info{};

internal/core/unittest/test_indexing.cpp

@@ -486,17 +486,18 @@ TEST_P(IndexTest, BuildAndQuery) {
     milvus::index::IndexBasePtr new_index;
     milvus::index::VectorIndex* vec_index = nullptr;
 
-    auto binary_set = index->Upload();
+    auto create_index_result = index->Upload();
     index.reset();
 
     new_index = milvus::index::IndexFactory::GetInstance().CreateIndex(
         create_index_info, file_manager_context);
     vec_index = dynamic_cast<milvus::index::VectorIndex*>(new_index.get());
 
-    std::vector<std::string> index_files;
+    auto index_files = create_index_result->GetIndexFiles();
-    for (auto& binary : binary_set.binary_map_) {
+    auto memSize = create_index_result->GetMemSize();
-        index_files.emplace_back(binary.first);
+    auto serializedSize = create_index_result->GetSerializedSize();
-    }
+    ASSERT_GT(memSize, 0);
+    ASSERT_GT(serializedSize, 0);
     load_conf = generate_load_conf(index_type, metric_type, 0);
     load_conf["index_files"] = index_files;
     ASSERT_NO_THROW(vec_index->Load(milvus::tracer::TraceContext{}, load_conf));
@@ -551,7 +552,7 @@ TEST_P(IndexTest, Mmap) {
     milvus::index::IndexBasePtr new_index;
     milvus::index::VectorIndex* vec_index = nullptr;
 
-    auto binary_set = index->Upload();
+    auto create_index_result = index->Upload();
     index.reset();
 
     new_index = milvus::index::IndexFactory::GetInstance().CreateIndex(
@@ -561,10 +562,11 @@ TEST_P(IndexTest, Mmap) {
     }
     vec_index = dynamic_cast<milvus::index::VectorIndex*>(new_index.get());
 
-    std::vector<std::string> index_files;
+    auto index_files = create_index_result->GetIndexFiles();
-    for (auto& binary : binary_set.binary_map_) {
+    auto memSize = create_index_result->GetMemSize();
-        index_files.emplace_back(binary.first);
+    auto serializedSize = create_index_result->GetSerializedSize();
-    }
+    ASSERT_GT(memSize, 0);
+    ASSERT_GT(serializedSize, 0);
     load_conf = generate_load_conf(index_type, metric_type, 0);
     load_conf["index_files"] = index_files;
     load_conf["mmap_filepath"] = "mmap/test_index_mmap_" + index_type;
@@ -610,24 +612,20 @@ TEST_P(IndexTest, GetVector) {
     milvus::index::IndexBasePtr new_index;
     milvus::index::VectorIndex* vec_index = nullptr;
 
-    auto binary_set = index->Upload();
+    auto create_index_result = index->Upload();
     index.reset();
-    std::vector<std::string> index_files;
+    auto index_files = create_index_result->GetIndexFiles();
-    for (auto& binary : binary_set.binary_map_) {
+    auto memSize = create_index_result->GetMemSize();
-        index_files.emplace_back(binary.first);
+    auto serializedSize = create_index_result->GetSerializedSize();
-    }
+    ASSERT_GT(memSize, 0);
+    ASSERT_GT(serializedSize, 0);
     new_index = milvus::index::IndexFactory::GetInstance().CreateIndex(
         create_index_info, file_manager_context);
     load_conf = generate_load_conf(index_type, metric_type, 0);
     load_conf["index_files"] = index_files;
 
     vec_index = dynamic_cast<milvus::index::VectorIndex*>(new_index.get());
-    if (index_type == knowhere::IndexEnum::INDEX_DISKANN) {
-        vec_index->Load(binary_set, load_conf);
-        EXPECT_EQ(vec_index->Count(), NB);
-    } else {
     vec_index->Load(milvus::tracer::TraceContext{}, load_conf);
-    }
     if (!is_sparse) {
         EXPECT_EQ(vec_index->GetDim(), DIM);
     }
@@ -716,12 +714,13 @@ TEST_P(IndexTest, GetVector_EmptySparseVector) {
     milvus::index::IndexBasePtr new_index;
     milvus::index::VectorIndex* vec_index = nullptr;
 
-    auto binary_set = index->Upload();
+    auto create_index_result = index->Upload();
     index.reset();
-    std::vector<std::string> index_files;
+    auto index_files = create_index_result->GetIndexFiles();
-    for (auto& binary : binary_set.binary_map_) {
+    auto memSize = create_index_result->GetMemSize();
-        index_files.emplace_back(binary.first);
+    auto serializedSize = create_index_result->GetSerializedSize();
-    }
+    ASSERT_GT(memSize, 0);
+    ASSERT_GT(serializedSize, 0);
     new_index = milvus::index::IndexFactory::GetInstance().CreateIndex(
         create_index_info, file_manager_context);
     load_conf = generate_load_conf(index_type, metric_type, 0);
@@ -797,16 +796,17 @@ TEST(Indexing, SearchDiskAnnWithInvalidParam) {
     ASSERT_NO_THROW(index->BuildWithDataset(xb_dataset, build_conf));
 
     // serialize and load disk index, disk index can only be search after loading for now
-    auto binary_set = index->Upload();
+    auto create_index_result = index->Upload();
+    auto memSize = create_index_result->GetMemSize();
+    auto serializedSize = create_index_result->GetSerializedSize();
+    ASSERT_GT(memSize, 0);
+    ASSERT_GT(serializedSize, 0);
+    auto index_files = create_index_result->GetIndexFiles();
     index.reset();
 
     auto new_index = milvus::index::IndexFactory::GetInstance().CreateIndex(
         create_index_info, file_manager_context);
     auto vec_index = dynamic_cast<milvus::index::VectorIndex*>(new_index.get());
-    std::vector<std::string> index_files;
-    for (auto& binary : binary_set.binary_map_) {
-        index_files.emplace_back(binary.first);
-    }
     auto load_conf = generate_load_conf(index_type, metric_type, NB);
     load_conf["index_files"] = index_files;
     vec_index->Load(milvus::tracer::TraceContext{}, load_conf);
@@ -880,16 +880,17 @@ TEST(Indexing, SearchDiskAnnWithFloat16) {
     ASSERT_NO_THROW(index->BuildWithDataset(xb_dataset, build_conf));
 
     // serialize and load disk index, disk index can only be search after loading for now
-    auto binary_set = index->Upload();
+    auto create_index_result = index->Upload();
+    auto memSize = create_index_result->GetMemSize();
+    auto serializedSize = create_index_result->GetSerializedSize();
+    ASSERT_GT(memSize, 0);
+    ASSERT_GT(serializedSize, 0);
+    auto index_files = create_index_result->GetIndexFiles();
     index.reset();
 
     auto new_index = milvus::index::IndexFactory::GetInstance().CreateIndex(
         create_index_info, file_manager_context);
     auto vec_index = dynamic_cast<milvus::index::VectorIndex*>(new_index.get());
-    std::vector<std::string> index_files;
-    for (auto& binary : binary_set.binary_map_) {
-        index_files.emplace_back(binary.first);
-    }
     auto load_conf = generate_load_conf<float16>(index_type, metric_type, NB);
     load_conf["index_files"] = index_files;
     vec_index->Load(milvus::tracer::TraceContext{}, load_conf);
@@ -962,16 +963,17 @@ TEST(Indexing, SearchDiskAnnWithBFloat16) {
     ASSERT_NO_THROW(index->BuildWithDataset(xb_dataset, build_conf));
 
     // serialize and load disk index, disk index can only be search after loading for now
-    auto binary_set = index->Upload();
+    auto create_index_result = index->Upload();
+    auto memSize = create_index_result->GetMemSize();
+    auto serializedSize = create_index_result->GetSerializedSize();
+    ASSERT_GT(memSize, 0);
+    ASSERT_GT(serializedSize, 0);
+    auto index_files = create_index_result->GetIndexFiles();
     index.reset();
 
     auto new_index = milvus::index::IndexFactory::GetInstance().CreateIndex(
         create_index_info, file_manager_context);
     auto vec_index = dynamic_cast<milvus::index::VectorIndex*>(new_index.get());
-    std::vector<std::string> index_files;
-    for (auto& binary : binary_set.binary_map_) {
-        index_files.emplace_back(binary.first);
-    }
     auto load_conf = generate_load_conf<bfloat16>(index_type, metric_type, NB);
     load_conf["index_files"] = index_files;
     vec_index->Load(milvus::tracer::TraceContext{}, load_conf);
@@ -993,3 +995,20 @@ TEST(Indexing, SearchDiskAnnWithBFloat16) {
     EXPECT_NO_THROW(vec_index->Query(xq_dataset, search_info, nullptr, result));
 }
 #endif
+
+TEST(Indexing, IndexStats) {
+    using milvus::index::IndexStats;
+    using milvus::index::SerializedIndexFileInfo;
+    auto sized_map =
+        std::map<std::string, int64_t>{{"file1", 100}, {"file2", 200}};
+    auto result = IndexStats::NewFromSizeMap(16, sized_map);
+    result->AppendSerializedIndexFileInfo(
+        SerializedIndexFileInfo{"file3", 300});
+    auto files = result->GetIndexFiles();
+    ASSERT_EQ(files.size(), 3);
+    ASSERT_EQ(files[0], "file1");
+    ASSERT_EQ(files[1], "file2");
+    ASSERT_EQ(files[2], "file3");
+    ASSERT_EQ(result->GetMemSize(), 16);
+    ASSERT_EQ(result->GetSerializedSize(), 600);
+}

internal/core/unittest/test_inverted_index.cpp

@@ -193,10 +193,12 @@ test_run() {
             dtype, config, ctx);
         index->Build();
 
-        auto bs = index->Upload();
+        auto create_index_result = index->Upload();
-        for (const auto& [key, _] : bs.binary_map_) {
+        auto memSize = create_index_result->GetMemSize();
-            index_files.push_back(key);
+        auto serializedSize = create_index_result->GetSerializedSize();
-        }
+        ASSERT_GT(memSize, 0);
+        ASSERT_GT(serializedSize, 0);
+        index_files = create_index_result->GetIndexFiles();
     }
 
     {
@@ -466,10 +468,12 @@ test_string() {
             dtype, config, ctx);
         index->Build();
 
-        auto bs = index->Upload();
+        auto create_index_result = index->Upload();
-        for (const auto& [key, _] : bs.binary_map_) {
+        auto memSize = create_index_result->GetMemSize();
-            index_files.push_back(key);
+        auto serializedSize = create_index_result->GetSerializedSize();
-        }
+        ASSERT_GT(memSize, 0);
+        ASSERT_GT(serializedSize, 0);
+        index_files = create_index_result->GetIndexFiles();
     }
 
     {

internal/core/unittest/test_utils.cpp

@@ -199,3 +199,9 @@ TEST(Util, dis_closer) {
     EXPECT_FALSE(milvus::query::dis_closer(0.1, 0.2, "IP"));
     EXPECT_FALSE(milvus::query::dis_closer(0.1, 0.1, "IP"));
 }
+
+TEST(Util, ProtoLayout) {
+    milvus::ProtoLayout layout;
+    milvus::proto::cgo::IndexStats result;
+    EXPECT_TRUE(layout.SerializeAndHoldProto(result));
+}

internal/core/unittest/test_utils/DataGen.h

@@ -1165,12 +1165,8 @@ GenVecIndexing(int64_t N,
         knowhere::Version::GetCurrentVersion().VersionNumber(),
         file_manager_context);
     indexing->BuildWithDataset(database, conf);
-    auto binary_set = indexing->Upload();
+    auto create_index_result = indexing->Upload();
-
+    auto index_files = create_index_result->GetIndexFiles();
-    std::vector<std::string> index_files;
-    for (auto& binary : binary_set.binary_map_) {
-        index_files.emplace_back(binary.first);
-    }
     conf["index_files"] = index_files;
     // we need a load stage to use index as the producation does
     // knowhere would do some data preparation in this stage

internal/datacoord/compaction_trigger_test.go

@@ -316,7 +316,7 @@ func Test_compactionTrigger_force(t *testing.T) {
 									IsDeleted:           false,
 									CreatedUTCTime:      0,
 									IndexFileKeys:       nil,
-									IndexSize:      0,
+									IndexSerializedSize: 0,
 									WriteHandoff:        false,
 								},
 							},
@@ -335,7 +335,7 @@ func Test_compactionTrigger_force(t *testing.T) {
 									IsDeleted:           false,
 									CreatedUTCTime:      0,
 									IndexFileKeys:       nil,
-									IndexSize:      0,
+									IndexSerializedSize: 0,
 									WriteHandoff:        false,
 								},
 							},
@@ -354,7 +354,7 @@ func Test_compactionTrigger_force(t *testing.T) {
 									IsDeleted:           false,
 									CreatedUTCTime:      0,
 									IndexFileKeys:       nil,
-									IndexSize:      0,
+									IndexSerializedSize: 0,
 									WriteHandoff:        false,
 								},
 							},

internal/datacoord/garbage_collector_test.go

@@ -500,7 +500,7 @@ func createMetaForRecycleUnusedSegIndexes(catalog metastore.DataCoordCatalog) *m
 						IsDeleted:           false,
 						CreatedUTCTime:      10,
 						IndexFileKeys:       []string{"file1", "file2"},
-						IndexSize:      0,
+						IndexSerializedSize: 0,
 						WriteHandoff:        false,
 					},
 				},
@@ -519,7 +519,7 @@ func createMetaForRecycleUnusedSegIndexes(catalog metastore.DataCoordCatalog) *m
 						IsDeleted:           false,
 						CreatedUTCTime:      10,
 						IndexFileKeys:       []string{"file1", "file2"},
-						IndexSize:      0,
+						IndexSerializedSize: 0,
 						WriteHandoff:        false,
 					},
 				},
@@ -545,7 +545,7 @@ func createMetaForRecycleUnusedSegIndexes(catalog metastore.DataCoordCatalog) *m
 		IsDeleted:           false,
 		CreatedUTCTime:      10,
 		IndexFileKeys:       []string{"file1", "file2"},
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 	})
 
 	meta.indexMeta.segmentBuildInfo.Add(&model.SegmentIndex{
@@ -562,7 +562,7 @@ func createMetaForRecycleUnusedSegIndexes(catalog metastore.DataCoordCatalog) *m
 		IsDeleted:           false,
 		CreatedUTCTime:      10,
 		IndexFileKeys:       []string{"file1", "file2"},
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 	})
 
 	for id, segment := range segments {
@@ -665,7 +665,7 @@ func createMetaTableForRecycleUnusedIndexFiles(catalog *datacoord.Catalog) *meta
 						IsDeleted:           false,
 						CreatedUTCTime:      10,
 						IndexFileKeys:       []string{"file1", "file2"},
-						IndexSize:      0,
+						IndexSerializedSize: 0,
 						WriteHandoff:        false,
 					},
 				},
@@ -684,7 +684,7 @@ func createMetaTableForRecycleUnusedIndexFiles(catalog *datacoord.Catalog) *meta
 						IsDeleted:           false,
 						CreatedUTCTime:      10,
 						IndexFileKeys:       nil,
-						IndexSize:      0,
+						IndexSerializedSize: 0,
 						WriteHandoff:        false,
 					},
 				},
@@ -723,7 +723,7 @@ func createMetaTableForRecycleUnusedIndexFiles(catalog *datacoord.Catalog) *meta
 		IsDeleted:           false,
 		CreatedUTCTime:      10,
 		IndexFileKeys:       []string{"file1", "file2"},
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 		WriteHandoff:        false,
 	})
 	meta.indexMeta.segmentBuildInfo.Add(&model.SegmentIndex{
@@ -740,7 +740,7 @@ func createMetaTableForRecycleUnusedIndexFiles(catalog *datacoord.Catalog) *meta
 		IsDeleted:           false,
 		CreatedUTCTime:      10,
 		IndexFileKeys:       nil,
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 		WriteHandoff:        false,
 	})
 	for id, segment := range segments {
@@ -1065,7 +1065,7 @@ func TestGarbageCollector_clearETCD(t *testing.T) {
 						IsDeleted:           false,
 						CreatedUTCTime:      0,
 						IndexFileKeys:       []string{"file1", "file2"},
-						IndexSize:      1024,
+						IndexSerializedSize: 1024,
 						WriteHandoff:        false,
 					},
 				},
@@ -1084,7 +1084,7 @@ func TestGarbageCollector_clearETCD(t *testing.T) {
 						IsDeleted:           false,
 						CreatedUTCTime:      0,
 						IndexFileKeys:       []string{"file3", "file4"},
-						IndexSize:      1024,
+						IndexSerializedSize: 1024,
 						WriteHandoff:        false,
 					},
 				},
@@ -1151,7 +1151,7 @@ func TestGarbageCollector_clearETCD(t *testing.T) {
 		IsDeleted:           false,
 		CreatedUTCTime:      0,
 		IndexFileKeys:       []string{"file1", "file2"},
-		IndexSize:      1024,
+		IndexSerializedSize: 1024,
 		WriteHandoff:        false,
 	})
 
@@ -1169,7 +1169,7 @@ func TestGarbageCollector_clearETCD(t *testing.T) {
 		IsDeleted:           false,
 		CreatedUTCTime:      0,
 		IndexFileKeys:       []string{"file3", "file4"},
-		IndexSize:      1024,
+		IndexSerializedSize: 1024,
 		WriteHandoff:        false,
 	})
 

internal/datacoord/index_meta.go

@@ -45,6 +45,7 @@ import (
 	"github.com/milvus-io/milvus/pkg/util/funcutil"
 	"github.com/milvus-io/milvus/pkg/util/indexparams"
 	"github.com/milvus-io/milvus/pkg/util/metricsinfo"
+	"github.com/milvus-io/milvus/pkg/util/paramtable"
 	"github.com/milvus-io/milvus/pkg/util/timerecord"
 	"github.com/milvus-io/milvus/pkg/util/tsoutil"
 	"github.com/milvus-io/milvus/pkg/util/typeutil"
@@ -74,7 +75,7 @@ func newIndexTaskStats(s *model.SegmentIndex) *metricsinfo.IndexTaskStats {
 		BuildID:         s.BuildID,
 		IndexState:      s.IndexState.String(),
 		FailReason:      s.FailReason,
-		IndexSize:       s.IndexSize,
+		IndexSize:       s.IndexMemSize,
 		IndexVersion:    s.IndexVersion,
 		CreatedUTCTime:  typeutil.TimestampToString(s.CreatedUTCTime * 1000),
 		FinishedUTCTime: typeutil.TimestampToString(s.FinishedUTCTime * 1000),
@@ -154,6 +155,9 @@ func (m *indexMeta) reloadFromKV() error {
 		return err
 	}
 	for _, segIdx := range segmentIndexes {
+		if segIdx.IndexMemSize == 0 {
+			segIdx.IndexMemSize = segIdx.IndexSerializedSize * paramtable.Get().DataCoordCfg.IndexMemSizeEstimateMultiplier.GetAsUint64()
+		}
 		m.updateSegmentIndex(segIdx)
 		metrics.FlushedSegmentFileNum.WithLabelValues(metrics.IndexFileLabel).Observe(float64(len(segIdx.IndexFileKeys)))
 	}
@@ -788,7 +792,8 @@ func (m *indexMeta) FinishTask(taskInfo *workerpb.IndexTaskInfo) error {
 		segIdx.IndexState = taskInfo.GetState()
 		segIdx.IndexFileKeys = common.CloneStringList(taskInfo.GetIndexFileKeys())
 		segIdx.FailReason = taskInfo.GetFailReason()
-		segIdx.IndexSize = taskInfo.GetSerializedSize()
+		segIdx.IndexSerializedSize = taskInfo.GetSerializedSize()
+		segIdx.IndexMemSize = taskInfo.GetMemSize()
 		segIdx.CurrentIndexVersion = taskInfo.GetCurrentIndexVersion()
 		segIdx.FinishedUTCTime = uint64(time.Now().Unix())
 		return m.alterSegmentIndexes([]*model.SegmentIndex{segIdx})
@@ -885,8 +890,8 @@ func (m *indexMeta) SetStoredIndexFileSizeMetric(collections map[UniqueID]*colle
 		coll, ok := collections[segmentIdx.CollectionID]
 		if ok {
 			metrics.DataCoordStoredIndexFilesSize.WithLabelValues(coll.DatabaseName, coll.Schema.GetName(),
-				fmt.Sprint(segmentIdx.CollectionID)).Add(float64(segmentIdx.IndexSize))
+				fmt.Sprint(segmentIdx.CollectionID)).Add(float64(segmentIdx.IndexSerializedSize))
-			total += segmentIdx.IndexSize
+			total += segmentIdx.IndexSerializedSize
 		}
 	}
 	return total
@@ -1135,7 +1140,7 @@ func (m *indexMeta) GetSegmentIndexedFields(collectionID UniqueID, segmentID Uni
 				IndexFieldID: index.IndexID,
 				IndexID:      index.IndexID,
 				BuildID:      buildID,
-				IndexSize:    int64(si.IndexSize),
+				IndexSize:    int64(si.IndexSerializedSize),
 			})
 		}
 	}

internal/datacoord/index_meta_test.go

@@ -530,7 +530,7 @@ func TestMeta_AddSegmentIndex(t *testing.T) {
 		IsDeleted:           false,
 		CreatedUTCTime:      12,
 		IndexFileKeys:       nil,
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 	}
 
 	t.Run("save meta fail", func(t *testing.T) {
@@ -677,7 +677,7 @@ func TestMeta_GetSegmentIndexState(t *testing.T) {
 			IsDeleted:           false,
 			CreatedUTCTime:      12,
 			IndexFileKeys:       nil,
-			IndexSize:      0,
+			IndexSerializedSize: 0,
 		})
 
 		state := m.GetSegmentIndexState(collID, segID, indexID)
@@ -699,7 +699,7 @@ func TestMeta_GetSegmentIndexState(t *testing.T) {
 			IsDeleted:           false,
 			CreatedUTCTime:      12,
 			IndexFileKeys:       nil,
-			IndexSize:      0,
+			IndexSerializedSize: 0,
 		})
 
 		state := m.GetSegmentIndexState(collID, segID, indexID)
@@ -747,7 +747,7 @@ func TestMeta_GetIndexedSegment(t *testing.T) {
 				IsDeleted:           false,
 				CreatedUTCTime:      10,
 				IndexFileKeys:       nil,
-				IndexSize:      0,
+				IndexSerializedSize: 0,
 			},
 		},
 	}
@@ -783,7 +783,7 @@ func TestMeta_GetIndexedSegment(t *testing.T) {
 		IsDeleted:           false,
 		CreatedUTCTime:      10,
 		IndexFileKeys:       nil,
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 	})
 
 	t.Run("success", func(t *testing.T) {
@@ -1105,7 +1105,7 @@ func TestMeta_GetIndexJob(t *testing.T) {
 		IsDeleted:           false,
 		CreatedUTCTime:      0,
 		IndexFileKeys:       nil,
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 	})
 
 	t.Run("exist", func(t *testing.T) {
@@ -1193,7 +1193,7 @@ func updateSegmentIndexMeta(t *testing.T) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      0,
 		IndexFileKeys:       nil,
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 	})
 
 	return &indexMeta{
@@ -1214,7 +1214,7 @@ func updateSegmentIndexMeta(t *testing.T) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      0,
 					IndexFileKeys:       nil,
-					IndexSize:      0,
+					IndexSerializedSize: 0,
 				},
 			},
 		},
@@ -1527,7 +1527,7 @@ func TestBuildIndexTaskStatsJSON(t *testing.T) {
 		IndexID:             10,
 		IndexState:          commonpb.IndexState_Finished,
 		FailReason:          "",
-		IndexSize:      1024,
+		IndexSerializedSize: 1024,
 		IndexVersion:        1,
 		CreatedUTCTime:      uint64(time.Now().Unix()),
 	}
@@ -1538,7 +1538,7 @@ func TestBuildIndexTaskStatsJSON(t *testing.T) {
 		IndexID:             11,
 		IndexState:          commonpb.IndexState_Finished,
 		FailReason:          "",
-		IndexSize:      2048,
+		IndexSerializedSize: 2048,
 		IndexVersion:        1,
 		CreatedUTCTime:      uint64(time.Now().Unix()),
 	}
@@ -1651,7 +1651,7 @@ func TestMeta_GetSegmentIndexStatus(t *testing.T) {
 				IsDeleted:           false,
 				CreatedUTCTime:      12,
 				IndexFileKeys:       nil,
-				IndexSize:      0,
+				IndexSerializedSize: 0,
 			},
 		},
 		segID + 1: {},

internal/datacoord/index_service.go

@@ -932,7 +932,8 @@ func (s *Server) GetIndexInfos(ctx context.Context, req *indexpb.GetIndexInfoReq
 							IndexName:           s.meta.indexMeta.GetIndexNameByID(segIdx.CollectionID, segIdx.IndexID),
 							IndexParams:         indexParams,
 							IndexFilePaths:      indexFilePaths,
-							SerializedSize:      segIdx.IndexSize,
+							SerializedSize:      segIdx.IndexSerializedSize,
+							MemSize:             segIdx.IndexMemSize,
 							IndexVersion:        segIdx.IndexVersion,
 							NumRows:             segIdx.NumRows,
 							CurrentIndexVersion: segIdx.CurrentIndexVersion,

internal/datacoord/index_service_test.go

@@ -413,7 +413,7 @@ func TestServer_AlterIndex(t *testing.T) {
 					IsDeleted:           false,
 					CreatedUTCTime:      createTS,
 					IndexFileKeys:       nil,
-					IndexSize:      0,
+					IndexSerializedSize: 0,
 					WriteHandoff:        false,
 				},
 				indexID + 1: {
@@ -430,7 +430,7 @@ func TestServer_AlterIndex(t *testing.T) {
 					IsDeleted:           false,
 					CreatedUTCTime:      createTS,
 					IndexFileKeys:       nil,
-					IndexSize:      0,
+					IndexSerializedSize: 0,
 					WriteHandoff:        false,
 				},
 				indexID + 3: {
@@ -447,7 +447,7 @@ func TestServer_AlterIndex(t *testing.T) {
 					IsDeleted:           false,
 					CreatedUTCTime:      createTS,
 					IndexFileKeys:       nil,
-					IndexSize:      0,
+					IndexSerializedSize: 0,
 					WriteHandoff:        false,
 				},
 				indexID + 4: {
@@ -464,7 +464,7 @@ func TestServer_AlterIndex(t *testing.T) {
 					IsDeleted:           false,
 					CreatedUTCTime:      createTS,
 					IndexFileKeys:       nil,
-					IndexSize:      0,
+					IndexSerializedSize: 0,
 					WriteHandoff:        false,
 				},
 				indexID + 5: {
@@ -481,7 +481,7 @@ func TestServer_AlterIndex(t *testing.T) {
 					IsDeleted:           false,
 					CreatedUTCTime:      createTS,
 					IndexFileKeys:       nil,
-					IndexSize:      0,
+					IndexSerializedSize: 0,
 					WriteHandoff:        false,
 				},
 			},
@@ -856,7 +856,7 @@ func TestServer_GetIndexState(t *testing.T) {
 						IsDeleted:           false,
 						CreatedUTCTime:      0,
 						IndexFileKeys:       nil,
-						IndexSize:      0,
+						IndexSerializedSize: 0,
 						WriteHandoff:        false,
 					},
 				},
@@ -981,7 +981,7 @@ func TestServer_GetSegmentIndexState(t *testing.T) {
 			IsDeleted:           false,
 			CreatedUTCTime:      createTS,
 			IndexFileKeys:       []string{"file1", "file2"},
-			IndexSize:      1025,
+			IndexSerializedSize: 1025,
 			WriteHandoff:        false,
 		})
 		s.meta.segments.SetSegment(segID, &SegmentInfo{
@@ -1018,7 +1018,7 @@ func TestServer_GetSegmentIndexState(t *testing.T) {
 			IsDeleted:           false,
 			CreatedUTCTime:      createTS,
 			IndexFileKeys:       []string{"file1", "file2"},
-			IndexSize:      1025,
+			IndexSerializedSize: 1025,
 			WriteHandoff:        false,
 		})
 		resp, err := s.GetSegmentIndexState(ctx, req)
@@ -1140,7 +1140,7 @@ func TestServer_GetIndexBuildProgress(t *testing.T) {
 			IsDeleted:           false,
 			CreatedUTCTime:      createTS,
 			IndexFileKeys:       []string{"file1", "file2"},
-			IndexSize:      0,
+			IndexSerializedSize: 0,
 			WriteHandoff:        false,
 		})
 		s.meta.segments = NewSegmentsInfo()
@@ -1402,7 +1402,7 @@ func TestServer_DescribeIndex(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 						indexID + 1: {
@@ -1419,7 +1419,7 @@ func TestServer_DescribeIndex(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 						indexID + 3: {
@@ -1436,7 +1436,7 @@ func TestServer_DescribeIndex(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 						indexID + 4: {
@@ -1453,7 +1453,7 @@ func TestServer_DescribeIndex(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 						indexID + 5: {
@@ -1470,7 +1470,7 @@ func TestServer_DescribeIndex(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 					},
@@ -1907,7 +1907,7 @@ func TestServer_GetIndexStatistics(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 						indexID + 1: {
@@ -1924,7 +1924,7 @@ func TestServer_GetIndexStatistics(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 						indexID + 3: {
@@ -1941,7 +1941,7 @@ func TestServer_GetIndexStatistics(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 						indexID + 4: {
@@ -1958,7 +1958,7 @@ func TestServer_GetIndexStatistics(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 						indexID + 5: {
@@ -1975,7 +1975,7 @@ func TestServer_GetIndexStatistics(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 					},
@@ -2299,7 +2299,7 @@ func TestServer_GetIndexInfos(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      createTS,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 							WriteHandoff:        false,
 						},
 					},

internal/datacoord/metrics_info_test.go

@@ -719,7 +719,7 @@ func TestServer_getSegmentsJSON(t *testing.T) {
 							IsDeleted:           false,
 							CreatedUTCTime:      12,
 							IndexFileKeys:       nil,
-							IndexSize:      0,
+							IndexSerializedSize: 0,
 						},
 					},
 				},

internal/datacoord/server_test.go

@@ -1646,7 +1646,7 @@ func TestGetRecoveryInfo(t *testing.T) {
 			IsDeleted:           false,
 			CreatedUTCTime:      0,
 			IndexFileKeys:       nil,
-			IndexSize:      0,
+			IndexSerializedSize: 0,
 		})
 
 		req := &datapb.GetRecoveryInfoRequest{

internal/datacoord/services_test.go

@@ -1271,7 +1271,7 @@ func TestGetRecoveryInfoV2(t *testing.T) {
 			IsDeleted:           false,
 			CreatedUTCTime:      0,
 			IndexFileKeys:       nil,
-			IndexSize:      0,
+			IndexSerializedSize: 0,
 		})
 
 		ch := &channelMeta{Name: "vchan1", CollectionID: 0}

internal/datacoord/task_scheduler_test.go

@@ -71,7 +71,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      0,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	indexBuildInfo.Add(&model.SegmentIndex{
@@ -88,7 +88,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      1111,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	indexBuildInfo.Add(&model.SegmentIndex{
@@ -105,7 +105,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           true,
 		CreatedUTCTime:      1111,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	indexBuildInfo.Add(&model.SegmentIndex{
@@ -122,7 +122,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      1111,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	indexBuildInfo.Add(&model.SegmentIndex{
@@ -139,7 +139,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      1111,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	indexBuildInfo.Add(&model.SegmentIndex{
@@ -156,7 +156,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      1111,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	indexBuildInfo.Add(&model.SegmentIndex{
@@ -173,7 +173,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      1111,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	indexBuildInfo.Add(&model.SegmentIndex{
@@ -190,7 +190,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      1111,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	indexBuildInfo.Add(&model.SegmentIndex{
@@ -207,7 +207,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      1111,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	indexBuildInfo.Add(&model.SegmentIndex{
@@ -224,7 +224,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      1111,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	indexBuildInfo.Add(&model.SegmentIndex{
@@ -241,7 +241,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 		IsDeleted:           false,
 		CreatedUTCTime:      1111,
 		IndexFileKeys:       nil,
-		IndexSize:      1,
+		IndexSerializedSize: 1,
 	})
 
 	return &indexMeta{
@@ -291,7 +291,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      0,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 			segID + 1: {
@@ -309,7 +309,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      1111,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 			segID + 2: {
@@ -327,7 +327,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           true,
 					CreatedUTCTime:      1111,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 			segID + 3: {
@@ -345,7 +345,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      1111,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 			segID + 4: {
@@ -363,7 +363,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      1111,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 			segID + 5: {
@@ -381,7 +381,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      1111,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 			segID + 6: {
@@ -399,7 +399,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      1111,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 			segID + 7: {
@@ -417,7 +417,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      1111,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 			segID + 8: {
@@ -435,7 +435,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      1111,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 			segID + 9: {
@@ -453,7 +453,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      1111,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 			segID + 10: {
@@ -471,7 +471,7 @@ func createIndexMeta(catalog metastore.DataCoordCatalog) *indexMeta {
 					IsDeleted:           false,
 					CreatedUTCTime:      1111,
 					IndexFileKeys:       nil,
-					IndexSize:      1,
+					IndexSerializedSize: 1,
 				},
 			},
 		},
@@ -1554,7 +1554,7 @@ func (s *taskSchedulerSuite) Test_indexTaskWithMvOptionalScalarField() {
 						IsDeleted:           false,
 						CreatedUTCTime:      0,
 						IndexFileKeys:       nil,
-						IndexSize:      0,
+						IndexSerializedSize: 0,
 					},
 				},
 			},
@@ -1596,7 +1596,7 @@ func (s *taskSchedulerSuite) Test_indexTaskWithMvOptionalScalarField() {
 		IsDeleted:           false,
 		CreatedUTCTime:      0,
 		IndexFileKeys:       nil,
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 	})
 	cm := mocks.NewChunkManager(s.T())
 	cm.EXPECT().RootPath().Return("ut-index")

internal/indexnode/indexnode_service.go

@@ -132,6 +132,7 @@ func (i *IndexNode) QueryJobs(ctx context.Context, req *workerpb.QueryJobsReques
 				state:               info.state,
 				fileKeys:            common.CloneStringList(info.fileKeys),
 				serializedSize:      info.serializedSize,
+				memSize:             info.memSize,
 				failReason:          info.failReason,
 				currentIndexVersion: info.currentIndexVersion,
 				indexStoreVersion:   info.indexStoreVersion,
@@ -154,6 +155,7 @@ func (i *IndexNode) QueryJobs(ctx context.Context, req *workerpb.QueryJobsReques
 			ret.IndexInfos[i].State = info.state
 			ret.IndexInfos[i].IndexFileKeys = info.fileKeys
 			ret.IndexInfos[i].SerializedSize = info.serializedSize
+			ret.IndexInfos[i].MemSize = info.memSize
 			ret.IndexInfos[i].FailReason = info.failReason
 			ret.IndexInfos[i].CurrentIndexVersion = info.currentIndexVersion
 			ret.IndexInfos[i].IndexStoreVersion = info.indexStoreVersion
@@ -444,6 +446,7 @@ func (i *IndexNode) QueryJobsV2(ctx context.Context, req *workerpb.QueryJobsV2Re
 					state:               info.state,
 					fileKeys:            common.CloneStringList(info.fileKeys),
 					serializedSize:      info.serializedSize,
+					memSize:             info.memSize,
 					failReason:          info.failReason,
 					currentIndexVersion: info.currentIndexVersion,
 					indexStoreVersion:   info.indexStoreVersion,
@@ -462,6 +465,7 @@ func (i *IndexNode) QueryJobsV2(ctx context.Context, req *workerpb.QueryJobsV2Re
 				results[i].State = info.state
 				results[i].IndexFileKeys = info.fileKeys
 				results[i].SerializedSize = info.serializedSize
+				results[i].MemSize = info.memSize
 				results[i].FailReason = info.failReason
 				results[i].CurrentIndexVersion = info.currentIndexVersion
 				results[i].IndexStoreVersion = info.indexStoreVersion

internal/indexnode/task_index.go

@@ -332,7 +332,7 @@ func (it *indexBuildTask) PostExecute(ctx context.Context) error {
 			log.Warn("IndexNode indexBuildTask Execute CIndexDelete failed", zap.Error(err))
 		}
 	}
-	indexFilePath2Size, err := it.index.UpLoad()
+	indexStats, err := it.index.UpLoad()
 	if err != nil {
 		log.Warn("failed to upload index", zap.Error(err))
 		gcIndex()
@@ -347,19 +347,21 @@ func (it *indexBuildTask) PostExecute(ctx context.Context) error {
 	// use serialized size before encoding
 	var serializedSize uint64
 	saveFileKeys := make([]string, 0)
-	for filePath, fileSize := range indexFilePath2Size {
+	for _, indexInfo := range indexStats.GetSerializedIndexInfos() {
-		serializedSize += uint64(fileSize)
+		serializedSize += uint64(indexInfo.FileSize)
-		parts := strings.Split(filePath, "/")
+		parts := strings.Split(indexInfo.FileName, "/")
 		fileKey := parts[len(parts)-1]
 		saveFileKeys = append(saveFileKeys, fileKey)
 	}
 
-	it.node.storeIndexFilesAndStatistic(it.req.GetClusterID(), it.req.GetBuildID(), saveFileKeys, serializedSize, it.req.GetCurrentIndexVersion())
+	it.node.storeIndexFilesAndStatistic(it.req.GetClusterID(), it.req.GetBuildID(), saveFileKeys, serializedSize, uint64(indexStats.MemSize), it.req.GetCurrentIndexVersion())
-	log.Debug("save index files done", zap.Strings("IndexFiles", saveFileKeys))
 	saveIndexFileDur := it.tr.RecordSpan()
 	metrics.IndexNodeSaveIndexFileLatency.WithLabelValues(strconv.FormatInt(paramtable.GetNodeID(), 10)).Observe(saveIndexFileDur.Seconds())
 	it.tr.Elapse("index building all done")
-	log.Info("Successfully save index files")
+	log.Info("Successfully save index files",
+		zap.Uint64("serializedSize", serializedSize),
+		zap.Int64("memSize", indexStats.MemSize),
+		zap.Strings("indexFiles", saveFileKeys))
 	return nil
 }
 

internal/indexnode/taskinfo_ops.go

@@ -34,6 +34,7 @@ type indexTaskInfo struct {
 	state               commonpb.IndexState
 	fileKeys            []string
 	serializedSize      uint64
+	memSize             uint64
 	failReason          string
 	currentIndexVersion int32
 	indexStoreVersion   int64
@@ -90,6 +91,7 @@ func (i *IndexNode) storeIndexFilesAndStatistic(
 	buildID UniqueID,
 	fileKeys []string,
 	serializedSize uint64,
+	memSize uint64,
 	currentIndexVersion int32,
 ) {
 	key := taskKey{ClusterID: ClusterID, TaskID: buildID}
@@ -98,31 +100,12 @@ func (i *IndexNode) storeIndexFilesAndStatistic(
 	if info, ok := i.indexTasks[key]; ok {
 		info.fileKeys = common.CloneStringList(fileKeys)
 		info.serializedSize = serializedSize
+		info.memSize = memSize
 		info.currentIndexVersion = currentIndexVersion
 		return
 	}
 }
 
-func (i *IndexNode) storeIndexFilesAndStatisticV2(
-	ClusterID string,
-	buildID UniqueID,
-	fileKeys []string,
-	serializedSize uint64,
-	currentIndexVersion int32,
-	indexStoreVersion int64,
-) {
-	key := taskKey{ClusterID: ClusterID, TaskID: buildID}
-	i.stateLock.Lock()
-	defer i.stateLock.Unlock()
-	if info, ok := i.indexTasks[key]; ok {
-		info.fileKeys = common.CloneStringList(fileKeys)
-		info.serializedSize = serializedSize
-		info.currentIndexVersion = currentIndexVersion
-		info.indexStoreVersion = indexStoreVersion
-		return
-	}
-}
-
 func (i *IndexNode) deleteIndexTaskInfos(ctx context.Context, keys []taskKey) []*indexTaskInfo {
 	i.stateLock.Lock()
 	defer i.stateLock.Unlock()

internal/metastore/kv/datacoord/kv_catalog_test.go

@@ -1026,7 +1026,7 @@ func TestCatalog_CreateSegmentIndex(t *testing.T) {
 		IsDeleted:           false,
 		CreatedUTCTime:      0,
 		IndexFileKeys:       nil,
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 	}
 
 	t.Run("success", func(t *testing.T) {
@@ -1126,7 +1126,7 @@ func TestCatalog_AlterSegmentIndexes(t *testing.T) {
 		IsDeleted:           false,
 		CreatedUTCTime:      0,
 		IndexFileKeys:       nil,
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 	}
 
 	t.Run("add", func(t *testing.T) {

internal/metastore/model/segment_index.go

@@ -20,7 +20,12 @@ type SegmentIndex struct {
 	IsDeleted      bool
 	CreatedUTCTime uint64
 	IndexFileKeys  []string
-	IndexSize      uint64
+	// The byte size of serialized index data at oos. (compressed)
+	IndexSerializedSize uint64
+	// The byte size of index data in memory. (uncompressed)
+	// The IndexMemSize may not be stored at old milvus implementation, so it may be not accurate.
+	// (generated by the IndexSerializedSize multiplied with a configured compress-ratio).
+	IndexMemSize uint64
 	// deprecated
 	WriteHandoff        bool
 	CurrentIndexVersion int32
@@ -32,7 +37,6 @@ func UnmarshalSegmentIndexModel(segIndex *indexpb.SegmentIndex) *SegmentIndex {
 	if segIndex == nil {
 		return nil
 	}
-
 	return &SegmentIndex{
 		SegmentID:           segIndex.SegmentID,
 		CollectionID:        segIndex.CollectionID,
@@ -47,7 +51,8 @@ func UnmarshalSegmentIndexModel(segIndex *indexpb.SegmentIndex) *SegmentIndex {
 		IsDeleted:           segIndex.Deleted,
 		CreatedUTCTime:      segIndex.CreateTime,
 		IndexFileKeys:       common.CloneStringList(segIndex.IndexFileKeys),
-		IndexSize:           segIndex.SerializeSize,
+		IndexSerializedSize: segIndex.SerializeSize,
+		IndexMemSize:        segIndex.MemSize,
 		WriteHandoff:        segIndex.WriteHandoff,
 		CurrentIndexVersion: segIndex.GetCurrentIndexVersion(),
 		FinishedUTCTime:     segIndex.FinishedTime,
@@ -73,7 +78,8 @@ func MarshalSegmentIndexModel(segIdx *SegmentIndex) *indexpb.SegmentIndex {
 		IndexFileKeys:       common.CloneStringList(segIdx.IndexFileKeys),
 		Deleted:             segIdx.IsDeleted,
 		CreateTime:          segIdx.CreatedUTCTime,
-		SerializeSize:       segIdx.IndexSize,
+		SerializeSize:       segIdx.IndexSerializedSize,
+		MemSize:             segIdx.IndexMemSize,
 		WriteHandoff:        segIdx.WriteHandoff,
 		CurrentIndexVersion: segIdx.CurrentIndexVersion,
 		FinishedTime:        segIdx.FinishedUTCTime,
@@ -95,7 +101,8 @@ func CloneSegmentIndex(segIndex *SegmentIndex) *SegmentIndex {
 		IsDeleted:           segIndex.IsDeleted,
 		CreatedUTCTime:      segIndex.CreatedUTCTime,
 		IndexFileKeys:       common.CloneStringList(segIndex.IndexFileKeys),
-		IndexSize:           segIndex.IndexSize,
+		IndexSerializedSize: segIndex.IndexSerializedSize,
+		IndexMemSize:        segIndex.IndexMemSize,
 		WriteHandoff:        segIndex.WriteHandoff,
 		CurrentIndexVersion: segIndex.CurrentIndexVersion,
 		FinishedUTCTime:     segIndex.FinishedUTCTime,

internal/metastore/model/segment_index_test.go

@@ -44,7 +44,7 @@ var (
 		IsDeleted:           false,
 		CreatedUTCTime:      1,
 		IndexFileKeys:       nil,
-		IndexSize:      0,
+		IndexSerializedSize: 0,
 	}
 )
 

internal/querycoordv2/meta/coordinator_broker.go

@@ -356,7 +356,7 @@ func (broker *CoordinatorBroker) GetIndexInfo(ctx context.Context, collectionID
 				BuildID:             info.GetBuildID(),
 				IndexParams:         info.GetIndexParams(),
 				IndexFilePaths:      info.GetIndexFilePaths(),
-				IndexSize:           int64(info.GetSerializedSize()),
+				IndexSize:           int64(info.GetMemSize()),
 				IndexVersion:        info.GetIndexVersion(),
 				NumRows:             info.GetNumRows(),
 				CurrentIndexVersion: info.GetCurrentIndexVersion(),

internal/querynodev2/segments/segment.go

@@ -965,8 +965,7 @@ func GetCLoadInfoWithFunc(ctx context.Context,
 		IndexFiles:         indexInfo.GetIndexFilePaths(),
 		IndexEngineVersion: indexInfo.GetCurrentIndexVersion(),
 		IndexStoreVersion:  indexInfo.GetIndexStoreVersion(),
-		// TODO: For quickly fixing, we add the multiplier here, but those logic should be put at the datacoord after we add the mem size for each index.
+		IndexFileSize:      indexInfo.GetIndexSize(),
-		IndexFileSize: int64(paramtable.Get().DataCoordCfg.IndexMemSizeEstimateMultiplier.GetAsFloat() * float64(indexInfo.GetIndexSize())),
 	}
 
 	// 2.

internal/util/indexcgowrapper/index.go

@@ -5,6 +5,7 @@ package indexcgowrapper
 
 #include <stdlib.h>	// free
 #include "indexbuilder/index_c.h"
+#include "common/type_c.h"
 */
 import "C"
 
@@ -22,7 +23,9 @@ import (
 	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
 	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
 	"github.com/milvus-io/milvus/internal/storage"
+	"github.com/milvus-io/milvus/internal/util/segcore"
 	"github.com/milvus-io/milvus/pkg/log"
+	"github.com/milvus-io/milvus/pkg/proto/cgopb"
 	"github.com/milvus-io/milvus/pkg/proto/indexcgopb"
 )
 
@@ -40,7 +43,7 @@ type CodecIndex interface {
 	Load([]*Blob) error
 	Delete() error
 	CleanLocalData() error
-	UpLoad() (map[string]int64, error)
+	UpLoad() (*cgopb.IndexStats, error)
 }
 
 var _ CodecIndex = (*CgoIndex)(nil)
@@ -135,31 +138,21 @@ func CreateTextIndex(ctx context.Context, buildIndexInfo *indexcgopb.BuildIndexI
 			zap.Error(err))
 		return nil, err
 	}
-	var cBinarySet C.CBinarySet
+	result := C.CreateProtoLayout()
-	status := C.BuildTextIndex(&cBinarySet, (*C.uint8_t)(unsafe.Pointer(&buildIndexInfoBlob[0])), (C.uint64_t)(len(buildIndexInfoBlob)))
+	defer C.ReleaseProtoLayout(result)
+	status := C.BuildTextIndex(result, (*C.uint8_t)(unsafe.Pointer(&buildIndexInfoBlob[0])), (C.uint64_t)(len(buildIndexInfoBlob)))
 	if err := HandleCStatus(&status, "failed to build text index"); err != nil {
 		return nil, err
 	}
-
+	var indexStats cgopb.IndexStats
-	defer func() {
+	if err := segcore.UnmarshalProtoLayout(result, &indexStats); err != nil {
-		if cBinarySet != nil {
+		return nil, err
-			C.DeleteBinarySet(cBinarySet)
 	}
-	}()
 
 	res := make(map[string]int64)
-	indexFilePaths, err := GetBinarySetKeys(cBinarySet)
+	for _, indexInfo := range indexStats.GetSerializedIndexInfos() {
-	if err != nil {
+		res[indexInfo.FileName] = indexInfo.FileSize
-		return nil, err
 	}
-	for _, path := range indexFilePaths {
-		size, err := GetBinarySetSize(cBinarySet, path)
-		if err != nil {
-			return nil, err
-		}
-		res[path] = size
-	}
-
 	return res, nil
 }
 
@@ -405,31 +398,17 @@ func (index *CgoIndex) CleanLocalData() error {
 	return HandleCStatus(&status, "failed to clean cached data on disk")
 }
 
-func (index *CgoIndex) UpLoad() (map[string]int64, error) {
+func (index *CgoIndex) UpLoad() (*cgopb.IndexStats, error) {
-	var cBinarySet C.CBinarySet
+	result := C.CreateProtoLayout()
-
+	defer C.ReleaseProtoLayout(result)
-	status := C.SerializeIndexAndUpLoad(index.indexPtr, &cBinarySet)
+	status := C.SerializeIndexAndUpLoad(index.indexPtr, result)
-	defer func() {
-		if cBinarySet != nil {
-			C.DeleteBinarySet(cBinarySet)
-		}
-	}()
 	if err := HandleCStatus(&status, "failed to serialize index and upload index"); err != nil {
 		return nil, err
 	}
 
-	res := make(map[string]int64)
+	var indexStats cgopb.IndexStats
-	indexFilePaths, err := GetBinarySetKeys(cBinarySet)
+	if err := segcore.UnmarshalProtoLayout(result, &indexStats); err != nil {
-	if err != nil {
 		return nil, err
 	}
-	for _, path := range indexFilePaths {
+	return &indexStats, nil
-		size, err := GetBinarySetSize(cBinarySet, path)
-		if err != nil {
-			return nil, err
-		}
-		res[path] = size
-	}
-
-	return res, nil
 }

internal/util/segcore/cgo_util.go

@@ -21,6 +21,7 @@ package segcore
 
 #include "segcore/collection_c.h"
 #include "common/type_c.h"
+#include "common/protobuf_utils_c.h"
 #include "segcore/segment_c.h"
 #include "storage/storage_c.h"
 */
@@ -29,6 +30,7 @@ import "C"
 import (
 	"context"
 	"math"
+	"reflect"
 	"unsafe"
 
 	"google.golang.org/protobuf/proto"
@@ -50,6 +52,13 @@ func ConsumeCStatusIntoError(status *C.CStatus) error {
 	return merr.SegcoreError(int32(errorCode), errorMsg)
 }
 
+func UnmarshalProtoLayout(protoLayout any, msg proto.Message) error {
+	layout := unsafe.Pointer(reflect.ValueOf(protoLayout).Pointer())
+	cProtoLayout := (*C.ProtoLayout)(layout)
+	blob := (*(*[math.MaxInt32]byte)(cProtoLayout.blob))[:int(cProtoLayout.size):int(cProtoLayout.size)]
+	return proto.Unmarshal(blob, msg)
+}
+
 // unmarshalCProto unmarshal the proto from C memory
 func unmarshalCProto(cRes *C.CProto, msg proto.Message) error {
 	blob := (*(*[math.MaxInt32]byte)(cRes.proto_blob))[:int(cRes.proto_size):int(cRes.proto_size)]

internal/util/segcore/cgo_util_test.go

@@ -2,9 +2,13 @@ package segcore
 
 import (
 	"context"
+	"runtime"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"google.golang.org/protobuf/proto"
+
+	"github.com/milvus-io/milvus/pkg/proto/cgopb"
 )
 
 func TestConsumeCStatusIntoError(t *testing.T) {
@@ -17,3 +21,28 @@ func TestGetLocalUsedSize(t *testing.T) {
 	assert.NoError(t, err)
 	assert.NotNil(t, size)
 }
+
+func TestProtoLayout(t *testing.T) {
+	layout := CreateProtoLayout()
+	testProto := cgopb.IndexStats{
+		MemSize: 1024,
+		SerializedIndexInfos: []*cgopb.SerializedIndexFileInfo{
+			{
+				FileName: "test",
+				FileSize: 768,
+			},
+		},
+	}
+	msg, err := proto.Marshal(&testProto)
+	defer runtime.KeepAlive(msg)
+	assert.NoError(t, err)
+	SetProtoLayout(layout, msg)
+
+	resultProto := cgopb.IndexStats{}
+	UnmarshalProtoLayout(layout, &resultProto)
+
+	assert.True(t, proto.Equal(&testProto, &resultProto))
+	layout.blob = nil
+	layout.size = 0
+	ReleaseProtoLayout(layout)
+}

internal/util/segcore/cgo_util_test_only.go

@@ -0,0 +1,31 @@
+//go:build test
+// +build test
+
+package segcore
+
+/*
+#cgo pkg-config: milvus_core
+
+#include "common/protobuf_utils_c.h"
+*/
+import "C"
+
+import (
+	"reflect"
+	"unsafe"
+)
+
+func CreateProtoLayout() *C.ProtoLayout {
+	ptr := C.CreateProtoLayout()
+	layout := unsafe.Pointer(reflect.ValueOf(ptr).Pointer())
+	return (*C.ProtoLayout)(layout)
+}
+
+func SetProtoLayout(protoLayout *C.ProtoLayout, slice []byte) {
+	protoLayout.blob = unsafe.Pointer(&slice[0])
+	protoLayout.size = C.size_t(len(slice))
+}
+
+func ReleaseProtoLayout(protoLayout *C.ProtoLayout) {
+	C.ReleaseProtoLayout((C.ProtoLayoutInterface)(unsafe.Pointer(reflect.ValueOf(protoLayout).Pointer())))
+}

pkg/proto/cgo_msg.proto

@@ -22,3 +22,13 @@ message LoadIndexInfo {
   int32 index_engine_version = 15;
   int64 index_file_size = 16;
 }
+
+message IndexStats {
+  int64 mem_size = 1;
+  repeated SerializedIndexFileInfo serialized_index_infos = 3;
+}
+
+message SerializedIndexFileInfo {
+  string file_name = 1;
+  int64 file_size = 2;
+}

pkg/proto/cgopb/cgo_msg.pb.go

@@ -180,6 +180,116 @@ func (x *LoadIndexInfo) GetIndexFileSize() int64 {
 	return 0
 }
 
+type IndexStats struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	MemSize              int64                      `protobuf:"varint,1,opt,name=mem_size,json=memSize,proto3" json:"mem_size,omitempty"`
+	SerializedIndexInfos []*SerializedIndexFileInfo `protobuf:"bytes,3,rep,name=serialized_index_infos,json=serializedIndexInfos,proto3" json:"serialized_index_infos,omitempty"`
+}
+
+func (x *IndexStats) Reset() {
+	*x = IndexStats{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_cgo_msg_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *IndexStats) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*IndexStats) ProtoMessage() {}
+
+func (x *IndexStats) ProtoReflect() protoreflect.Message {
+	mi := &file_cgo_msg_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use IndexStats.ProtoReflect.Descriptor instead.
+func (*IndexStats) Descriptor() ([]byte, []int) {
+	return file_cgo_msg_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *IndexStats) GetMemSize() int64 {
+	if x != nil {
+		return x.MemSize
+	}
+	return 0
+}
+
+func (x *IndexStats) GetSerializedIndexInfos() []*SerializedIndexFileInfo {
+	if x != nil {
+		return x.SerializedIndexInfos
+	}
+	return nil
+}
+
+type SerializedIndexFileInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	FileName string `protobuf:"bytes,1,opt,name=file_name,json=fileName,proto3" json:"file_name,omitempty"`
+	FileSize int64  `protobuf:"varint,2,opt,name=file_size,json=fileSize,proto3" json:"file_size,omitempty"`
+}
+
+func (x *SerializedIndexFileInfo) Reset() {
+	*x = SerializedIndexFileInfo{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_cgo_msg_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SerializedIndexFileInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SerializedIndexFileInfo) ProtoMessage() {}
+
+func (x *SerializedIndexFileInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_cgo_msg_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SerializedIndexFileInfo.ProtoReflect.Descriptor instead.
+func (*SerializedIndexFileInfo) Descriptor() ([]byte, []int) {
+	return file_cgo_msg_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *SerializedIndexFileInfo) GetFileName() string {
+	if x != nil {
+		return x.FileName
+	}
+	return ""
+}
+
+func (x *SerializedIndexFileInfo) GetFileSize() int64 {
+	if x != nil {
+		return x.FileSize
+	}
+	return 0
+}
+
 var File_cgo_msg_proto protoreflect.FileDescriptor
 
 var file_cgo_msg_proto_rawDesc = []byte{
@@ -228,7 +338,21 @@ var file_cgo_msg_proto_rawDesc = []byte{
 	0x78, 0x50, 0x61, 0x72, 0x61, 0x6d, 0x73, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03,
 	0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6b, 0x65, 0x79, 0x12, 0x14,
 	0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x76,
-	0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38, 0x01, 0x42, 0x2d, 0x5a, 0x2b, 0x67, 0x69, 0x74, 0x68,
+	0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38, 0x01, 0x22, 0x88, 0x01, 0x0a, 0x0a, 0x49, 0x6e, 0x64,
+	0x65, 0x78, 0x53, 0x74, 0x61, 0x74, 0x73, 0x12, 0x19, 0x0a, 0x08, 0x6d, 0x65, 0x6d, 0x5f, 0x73,
+	0x69, 0x7a, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x03, 0x52, 0x07, 0x6d, 0x65, 0x6d, 0x53, 0x69,
+	0x7a, 0x65, 0x12, 0x5f, 0x0a, 0x16, 0x73, 0x65, 0x72, 0x69, 0x61, 0x6c, 0x69, 0x7a, 0x65, 0x64,
+	0x5f, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x5f, 0x69, 0x6e, 0x66, 0x6f, 0x73, 0x18, 0x03, 0x20, 0x03,
+	0x28, 0x0b, 0x32, 0x29, 0x2e, 0x6d, 0x69, 0x6c, 0x76, 0x75, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x2e, 0x63, 0x67, 0x6f, 0x2e, 0x53, 0x65, 0x72, 0x69, 0x61, 0x6c, 0x69, 0x7a, 0x65, 0x64,
+	0x49, 0x6e, 0x64, 0x65, 0x78, 0x46, 0x69, 0x6c, 0x65, 0x49, 0x6e, 0x66, 0x6f, 0x52, 0x14, 0x73,
+	0x65, 0x72, 0x69, 0x61, 0x6c, 0x69, 0x7a, 0x65, 0x64, 0x49, 0x6e, 0x64, 0x65, 0x78, 0x49, 0x6e,
+	0x66, 0x6f, 0x73, 0x22, 0x53, 0x0a, 0x17, 0x53, 0x65, 0x72, 0x69, 0x61, 0x6c, 0x69, 0x7a, 0x65,
+	0x64, 0x49, 0x6e, 0x64, 0x65, 0x78, 0x46, 0x69, 0x6c, 0x65, 0x49, 0x6e, 0x66, 0x6f, 0x12, 0x1b,
+	0x0a, 0x09, 0x66, 0x69, 0x6c, 0x65, 0x5f, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28,
+	0x09, 0x52, 0x08, 0x66, 0x69, 0x6c, 0x65, 0x4e, 0x61, 0x6d, 0x65, 0x12, 0x1b, 0x0a, 0x09, 0x66,
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@@ -246,20 +370,23 @@ func file_cgo_msg_proto_rawDescGZIP() []byte {
 	return file_cgo_msg_proto_rawDescData
 }
 
-var file_cgo_msg_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_cgo_msg_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
 var file_cgo_msg_proto_goTypes = []interface{}{
 	(*LoadIndexInfo)(nil),           // 0: milvus.proto.cgo.LoadIndexInfo
-	nil,                          // 1: milvus.proto.cgo.LoadIndexInfo.IndexParamsEntry
+	(*IndexStats)(nil),              // 1: milvus.proto.cgo.IndexStats
-	(*schemapb.FieldSchema)(nil), // 2: milvus.proto.schema.FieldSchema
+	(*SerializedIndexFileInfo)(nil), // 2: milvus.proto.cgo.SerializedIndexFileInfo
+	nil,                             // 3: milvus.proto.cgo.LoadIndexInfo.IndexParamsEntry
+	(*schemapb.FieldSchema)(nil),    // 4: milvus.proto.schema.FieldSchema
 }
 var file_cgo_msg_proto_depIdxs = []int32{
-	2, // 0: milvus.proto.cgo.LoadIndexInfo.field:type_name -> milvus.proto.schema.FieldSchema
+	4, // 0: milvus.proto.cgo.LoadIndexInfo.field:type_name -> milvus.proto.schema.FieldSchema
-	1, // 1: milvus.proto.cgo.LoadIndexInfo.index_params:type_name -> milvus.proto.cgo.LoadIndexInfo.IndexParamsEntry
+	3, // 1: milvus.proto.cgo.LoadIndexInfo.index_params:type_name -> milvus.proto.cgo.LoadIndexInfo.IndexParamsEntry
-	2, // [2:2] is the sub-list for method output_type
+	2, // 2: milvus.proto.cgo.IndexStats.serialized_index_infos:type_name -> milvus.proto.cgo.SerializedIndexFileInfo
-	2, // [2:2] is the sub-list for method input_type
+	3, // [3:3] is the sub-list for method output_type
-	2, // [2:2] is the sub-list for extension type_name
+	3, // [3:3] is the sub-list for method input_type
-	2, // [2:2] is the sub-list for extension extendee
+	3, // [3:3] is the sub-list for extension type_name
-	0, // [0:2] is the sub-list for field type_name
+	3, // [3:3] is the sub-list for extension extendee
+	0, // [0:3] is the sub-list for field type_name
 }
 
 func init() { file_cgo_msg_proto_init() }
@@ -280,6 +407,30 @@ func file_cgo_msg_proto_init() {
 				return nil
 			}
 		}
+		file_cgo_msg_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*IndexStats); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_cgo_msg_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SerializedIndexFileInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -287,7 +438,7 @@ func file_cgo_msg_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_cgo_msg_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   2,
+			NumMessages:   4,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

pkg/proto/index_coord.proto

@@ -76,11 +76,12 @@ message SegmentIndex {
     repeated string index_file_keys = 11;
     bool deleted = 12;
     uint64 create_time = 13;
-    uint64 serialize_size = 14;
+    uint64 serialize_size = 14; // the total size of index file at oos. (may be compress)
     bool write_handoff = 15;
     int32 current_index_version = 16;
     int64 index_store_version = 17;
     uint64 finished_time = 18;
+    uint64 mem_size = 19; // the total size of index file at local (disk or memory) before loading by knowhere. (not compress)
 }
 
 message RegisterNodeRequest {
@@ -160,6 +161,7 @@ message IndexFilePathInfo {
     int64 index_version = 9;
     int64 num_rows = 10;
     int32 current_index_version = 11;
+    uint64 mem_size = 12;
 }
 
 message SegmentInfo {

pkg/proto/worker.proto

@@ -169,6 +169,7 @@ message IndexTaskInfo {
   string fail_reason = 5;
   int32 current_index_version = 6;
   int64 index_store_version = 7;
+  uint64 mem_size = 8;
 }
 
 message IndexJobResults {

pkg/proto/workerpb/worker.pb.go

@@ -1139,6 +1139,7 @@ type IndexTaskInfo struct {
 	FailReason          string              `protobuf:"bytes,5,opt,name=fail_reason,json=failReason,proto3" json:"fail_reason,omitempty"`
 	CurrentIndexVersion int32               `protobuf:"varint,6,opt,name=current_index_version,json=currentIndexVersion,proto3" json:"current_index_version,omitempty"`
 	IndexStoreVersion   int64               `protobuf:"varint,7,opt,name=index_store_version,json=indexStoreVersion,proto3" json:"index_store_version,omitempty"`
+	MemSize             uint64              `protobuf:"varint,8,opt,name=mem_size,json=memSize,proto3" json:"mem_size,omitempty"`
 }
 
 func (x *IndexTaskInfo) Reset() {
@@ -1222,6 +1223,13 @@ func (x *IndexTaskInfo) GetIndexStoreVersion() int64 {
 	return 0
 }
 
+func (x *IndexTaskInfo) GetMemSize() uint64 {
+	if x != nil {
+		return x.MemSize
+	}
+	return 0
+}
+
 type IndexJobResults struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2002,7 +2010,7 @@ var file_worker_proto_rawDesc = []byte{
 	0x44, 0x73, 0x12, 0x36, 0x0a, 0x08, 0x6a, 0x6f, 0x62, 0x5f, 0x74, 0x79, 0x70, 0x65, 0x18, 0x03,
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 	0x6e, 0x64, 0x65, 0x78, 0x54, 0x61, 0x73, 0x6b, 0x49, 0x6e, 0x66, 0x6f, 0x12, 0x18, 0x0a, 0x07,
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@@ -2022,175 +2030,177 @@ var file_worker_proto_rawDesc = []byte{
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 var (