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c4ae9f4ece
related: https://github.com/milvus-io/milvus/issues/39173 Signed-off-by: shaoting-huang <shaoting.huang@zilliz.com>
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
// Copyright 2023 Zilliz
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package lock
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import (
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"sync"
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"github.com/cockroachdb/errors"
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"go.uber.org/zap"
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"github.com/milvus-io/milvus/internal/storagev2/common/constant"
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"github.com/milvus-io/milvus/internal/storagev2/common/log"
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)
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type LockManager interface {
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// Acquire the lock, wait until the lock is available, return the version to be modified or use the newest version
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Acquire() (version int64, useLatestVersion bool, err error)
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// Release the lock, accepts the new allocated manifest version and success state of operations between Acquire and Release as parameters
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Release(version int64, success bool) error
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}
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type EmptyLockManager struct{}
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func (h *EmptyLockManager) Acquire() (version int64, useLatestVersion bool, err error) {
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return constant.LatestManifestVersion, true, nil
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}
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func (h *EmptyLockManager) Release(_ int64, _ bool) error {
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return nil
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}
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type MemoryLockManager struct {
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mu sync.Mutex
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locks map[int64]bool
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nextVersion int64
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}
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func NewMemoryLockManager() *MemoryLockManager {
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return &MemoryLockManager{
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mu: sync.Mutex{},
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locks: make(map[int64]bool),
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nextVersion: 0,
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}
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}
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func (m *MemoryLockManager) Acquire() (version int64, useLatestVersion bool, err error) {
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m.mu.Lock()
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defer m.mu.Unlock()
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version = m.nextVersion
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if m.locks[version] {
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log.Warn("lock is already acquired", zap.Int64("version", version))
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return version, false, errors.New("lock is already acquired")
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}
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if version == constant.LatestManifestVersion {
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useLatestVersion = true
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} else {
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useLatestVersion = false
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}
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m.locks[version] = true
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log.Info("acquire lock", zap.Int64("version", version), zap.Bool("useLatestVersion", useLatestVersion))
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return version, useLatestVersion, nil
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}
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func (m *MemoryLockManager) Release(version int64, success bool) error {
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m.mu.Lock()
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defer m.mu.Unlock()
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realVersion := int64(0)
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realVersion = version - 1
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if !m.locks[realVersion] {
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return errors.New("lock is already released or does not exist")
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}
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m.locks[realVersion] = false
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log.Info("release lock", zap.Int64("version", realVersion), zap.Bool("success", success))
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if success {
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m.nextVersion = version
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} else {
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m.nextVersion = constant.LatestManifestVersion
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}
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return nil
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}
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