fix: Fix empty import task result (#38316)

Ensure the idempotency of import tasks to prevent duplicate tasks in
DataNode.

issue: https://github.com/milvus-io/milvus/issues/38313

Signed-off-by: bigsheeper <yihao.dai@zilliz.com>

internal/datacoord/import_util.go

@@ -156,7 +156,7 @@ func AssignSegments(job ImportJob, task ImportTask, alloc allocator.Allocator, m
 		defer cancel()
 		for size > 0 {
 			segmentInfo, err := AllocImportSegment(ctx, alloc, meta,
-				task.GetTaskID(), task.GetCollectionID(), partitionID, vchannel, segmentLevel)
+				task.GetJobID(), task.GetTaskID(), task.GetCollectionID(), partitionID, vchannel, segmentLevel)
 			if err != nil {
 				return err
 			}
@@ -180,8 +180,8 @@ func AssignSegments(job ImportJob, task ImportTask, alloc allocator.Allocator, m
 func AllocImportSegment(ctx context.Context,
 	alloc allocator.Allocator,
 	meta *meta,
-	taskID int64, collectionID UniqueID,
+	jobID int64, taskID int64,
-	partitionID UniqueID,
+	collectionID UniqueID, partitionID UniqueID,
 	channelName string,
 	level datapb.SegmentLevel,
 ) (*SegmentInfo, error) {
@@ -221,6 +221,7 @@ func AllocImportSegment(ctx context.Context,
 		return nil, err
 	}
 	log.Info("add import segment done",
+		zap.Int64("jobID", jobID),
 		zap.Int64("taskID", taskID),
 		zap.Int64("collectionID", segmentInfo.CollectionID),
 		zap.Int64("segmentID", segmentInfo.ID),

internal/datanode/importv2/task_manager.go

@@ -18,6 +18,8 @@ package importv2
 
 import (
 	"sync"
+
+	"github.com/milvus-io/milvus/pkg/log"
 )
 
 type TaskManager interface {
@@ -42,6 +44,10 @@ func NewTaskManager() TaskManager {
 func (m *taskManager) Add(task Task) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
+	if _, ok := m.tasks[task.GetTaskID()]; ok {
+		log.Warn("duplicated task", WrapLogFields(task)...)
+		return
+	}
 	m.tasks[task.GetTaskID()] = task
 }
 

internal/datanode/importv2/task_manager_test.go

@@ -65,6 +65,13 @@ func TestImportManager(t *testing.T) {
 	assert.Equal(t, 1, len(tasks))
 	assert.Equal(t, task2.GetTaskID(), tasks[0].GetTaskID())
 
+	// check idempotency
+	manager.Add(task2)
+	tasks = manager.GetBy(WithStates(datapb.ImportTaskStateV2_Completed))
+	assert.Equal(t, 1, len(tasks))
+	assert.Equal(t, task2.GetTaskID(), tasks[0].GetTaskID())
+	assert.True(t, task2 == tasks[0])
+
 	manager.Update(task1.GetTaskID(), UpdateState(datapb.ImportTaskStateV2_Failed))
 	task := manager.Get(task1.GetTaskID())
 	assert.Equal(t, datapb.ImportTaskStateV2_Failed, task.GetState())