mirror of
https://gitee.com/milvus-io/milvus.git
synced 2024-12-04 12:59:23 +08:00
502 lines
13 KiB
Go
502 lines
13 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
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// with the License. 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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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package dataservice
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import (
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"context"
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"fmt"
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"sync"
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"time"
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"go.uber.org/zap"
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"github.com/milvus-io/milvus/internal/log"
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"github.com/milvus-io/milvus/internal/msgstream"
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"github.com/milvus-io/milvus/internal/proto/commonpb"
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"github.com/milvus-io/milvus/internal/proto/internalpb"
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"github.com/milvus-io/milvus/internal/util/trace"
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"github.com/milvus-io/milvus/internal/util/tsoutil"
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"github.com/milvus-io/milvus/internal/proto/datapb"
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)
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type errRemainInSufficient struct {
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requestRows int64
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}
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func newErrRemainInSufficient(requestRows int64) errRemainInSufficient {
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return errRemainInSufficient{requestRows: requestRows}
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}
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func (err errRemainInSufficient) Error() string {
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return fmt.Sprintf("segment remaining is insufficient for %d", err.requestRows)
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}
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// Manager manage segment related operations.
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type Manager interface {
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// AllocSegment allocate rows and record the allocation.
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AllocSegment(ctx context.Context, collectionID, partitionID UniqueID, channelName string, requestRows int64) (UniqueID, int64, Timestamp, error)
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// DropSegment drop the segment from allocator.
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DropSegment(ctx context.Context, segmentID UniqueID)
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// SealAllSegments get all opened segment ids of collection. return success and failed segment ids
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SealAllSegments(ctx context.Context, collectionID UniqueID) error
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// GetFlushableSegments return flushable segment ids
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GetFlushableSegments(ctx context.Context, channel string, ts Timestamp) ([]UniqueID, error)
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// UpdateSegmentStats update segment status
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UpdateSegmentStats(stat *internalpb.SegmentStatisticsUpdates)
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}
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type segmentStatus struct {
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id UniqueID
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collectionID UniqueID
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partitionID UniqueID
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sealed bool
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total int64
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insertChannel string
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allocations []*allocation
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lastExpireTime Timestamp
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currentRows int64
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}
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type allocation struct {
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rowNums int64
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expireTime Timestamp
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}
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type SegmentManager struct {
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meta *meta
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mu sync.RWMutex
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allocator allocator
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helper allocHelper
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stats map[UniqueID]*segmentStatus //segment id -> status
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estimatePolicy calUpperLimitPolicy
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allocPolicy allocatePolicy
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// sealPolicy sealPolicy
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segmentSealPolicies []segmentSealPolicy
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channelSealPolicies []channelSealPolicy
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flushPolicy flushPolicy
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}
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type allocHelper struct {
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afterCreateSegment func(segment *datapb.SegmentInfo) error
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}
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type allocOption struct {
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apply func(manager *SegmentManager)
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}
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func withAllocHelper(helper allocHelper) allocOption {
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return allocOption{
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apply: func(manager *SegmentManager) { manager.helper = helper },
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}
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}
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func defaultAllocHelper() allocHelper {
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return allocHelper{
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afterCreateSegment: func(segment *datapb.SegmentInfo) error { return nil },
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}
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}
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func withCalUpperLimitPolicy(policy calUpperLimitPolicy) allocOption {
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return allocOption{
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apply: func(manager *SegmentManager) { manager.estimatePolicy = policy },
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}
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}
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func withAllocPolicy(policy allocatePolicy) allocOption {
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return allocOption{
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apply: func(manager *SegmentManager) { manager.allocPolicy = policy },
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}
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}
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// func withSealPolicy(policy sealPolicy) allocOption {
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// return allocOption{
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// apply: func(manager *SegmentManager) { manager.sealPolicy = policy },
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// }
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// }
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func withSegmentSealPolices(policies ...segmentSealPolicy) allocOption {
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return allocOption{
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apply: func(manager *SegmentManager) {
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// do override instead of append, to override default options
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manager.segmentSealPolicies = policies
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},
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}
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}
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func withChannelSealPolices(policies ...channelSealPolicy) allocOption {
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return allocOption{
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apply: func(manager *SegmentManager) {
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// do override instead of append, to override default options
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manager.channelSealPolicies = policies
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},
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}
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}
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func withFlushPolicy(policy flushPolicy) allocOption {
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return allocOption{
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apply: func(manager *SegmentManager) { manager.flushPolicy = policy },
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}
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}
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func defaultCalUpperLimitPolicy() calUpperLimitPolicy {
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return newCalBySchemaPolicy()
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}
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func defaultAlocatePolicy() allocatePolicy {
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return newAllocatePolicyV1()
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}
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func defaultSealPolicy() sealPolicy {
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return newSealPolicyV1()
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}
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func defaultSegmentSealPolicy() segmentSealPolicy {
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return getSegmentCapacityPolicy(Params.SegmentSizeFactor)
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}
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func defaultFlushPolicy() flushPolicy {
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return newFlushPolicyV1()
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}
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func newSegmentManager(meta *meta, allocator allocator, opts ...allocOption) *SegmentManager {
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manager := &SegmentManager{
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meta: meta,
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allocator: allocator,
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helper: defaultAllocHelper(),
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stats: make(map[UniqueID]*segmentStatus),
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estimatePolicy: defaultCalUpperLimitPolicy(),
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allocPolicy: defaultAlocatePolicy(),
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segmentSealPolicies: []segmentSealPolicy{defaultSegmentSealPolicy()}, // default only segment size policy
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channelSealPolicies: []channelSealPolicy{}, // no default channel seal policy
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flushPolicy: defaultFlushPolicy(),
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}
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for _, opt := range opts {
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opt.apply(manager)
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}
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manager.loadSegmentsFromMeta()
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return manager
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}
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func (s *SegmentManager) loadSegmentsFromMeta() {
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segments := s.meta.GetUnFlushedSegments()
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ids := make([]UniqueID, 0, len(segments))
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for _, seg := range segments {
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ids = append(ids, seg.ID)
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stat := &segmentStatus{
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id: seg.ID,
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collectionID: seg.CollectionID,
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partitionID: seg.PartitionID,
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total: seg.MaxRowNum,
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allocations: []*allocation{},
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insertChannel: seg.InsertChannel,
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lastExpireTime: seg.LastExpireTime,
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sealed: seg.State == commonpb.SegmentState_Sealed,
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}
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s.stats[seg.ID] = stat
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}
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log.Debug("Restore segment allocation", zap.Int64s("segments", ids))
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}
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func (s *SegmentManager) AllocSegment(ctx context.Context, collectionID UniqueID,
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partitionID UniqueID, channelName string, requestRows int64) (segID UniqueID, retCount int64, expireTime Timestamp, err error) {
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sp, _ := trace.StartSpanFromContext(ctx)
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defer sp.Finish()
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s.mu.Lock()
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defer s.mu.Unlock()
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var success bool
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var status *segmentStatus
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for _, segStatus := range s.stats {
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if segStatus.sealed || segStatus.collectionID != collectionID ||
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segStatus.partitionID != partitionID || segStatus.insertChannel != channelName {
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continue
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}
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success, err = s.alloc(segStatus, requestRows)
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if err != nil {
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return
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}
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if success {
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status = segStatus
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break
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}
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}
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if !success {
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status, err = s.openNewSegment(ctx, collectionID, partitionID, channelName)
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if err != nil {
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return
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}
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success, err = s.alloc(status, requestRows)
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if err != nil {
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return
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}
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if !success {
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err = newErrRemainInSufficient(requestRows)
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return
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}
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}
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segID = status.id
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retCount = requestRows
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expireTime = status.lastExpireTime
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return
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}
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func (s *SegmentManager) alloc(segStatus *segmentStatus, numRows int64) (bool, error) {
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var allocSize int64
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for _, allocation := range segStatus.allocations {
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allocSize += allocation.rowNums
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}
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if !s.allocPolicy.apply(segStatus.total, segStatus.currentRows, allocSize, numRows) {
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return false, nil
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}
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expireTs, err := s.genExpireTs()
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if err != nil {
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return false, err
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}
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alloc := &allocation{
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rowNums: numRows,
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expireTime: expireTs,
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}
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segStatus.lastExpireTime = expireTs
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segStatus.allocations = append(segStatus.allocations, alloc)
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if err := s.meta.SetLastExpireTime(segStatus.id, expireTs); err != nil {
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return false, err
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}
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return true, nil
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}
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func (s *SegmentManager) genExpireTs() (Timestamp, error) {
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ts, err := s.allocator.allocTimestamp()
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if err != nil {
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return 0, err
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}
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physicalTs, logicalTs := tsoutil.ParseTS(ts)
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expirePhysicalTs := physicalTs.Add(time.Duration(Params.SegIDAssignExpiration) * time.Millisecond)
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expireTs := tsoutil.ComposeTS(expirePhysicalTs.UnixNano()/int64(time.Millisecond), int64(logicalTs))
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return expireTs, nil
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}
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func (s *SegmentManager) openNewSegment(ctx context.Context, collectionID UniqueID, partitionID UniqueID, channelName string) (*segmentStatus, error) {
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sp, _ := trace.StartSpanFromContext(ctx)
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defer sp.Finish()
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id, err := s.allocator.allocID()
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if err != nil {
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return nil, err
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}
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totalRows, err := s.estimateTotalRows(collectionID)
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if err != nil {
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return nil, err
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}
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segStatus := &segmentStatus{
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id: id,
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collectionID: collectionID,
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partitionID: partitionID,
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sealed: false,
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total: int64(totalRows),
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insertChannel: channelName,
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allocations: []*allocation{},
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lastExpireTime: 0,
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currentRows: 0,
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}
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s.stats[id] = segStatus
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segmentInfo := &datapb.SegmentInfo{
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ID: id,
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CollectionID: collectionID,
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PartitionID: partitionID,
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InsertChannel: channelName,
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NumOfRows: 0,
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State: commonpb.SegmentState_Growing,
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MaxRowNum: int64(totalRows),
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LastExpireTime: 0,
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StartPosition: &internalpb.MsgPosition{
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ChannelName: channelName,
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MsgID: []byte{},
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MsgGroup: "",
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Timestamp: 0,
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},
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}
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if err := s.meta.AddSegment(segmentInfo); err != nil {
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return nil, err
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}
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log.Debug("datacoord: estimateTotalRows: ",
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zap.Int64("CollectionID", segmentInfo.CollectionID),
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zap.Int64("SegmentID", segmentInfo.ID),
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zap.Int("Rows", totalRows),
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zap.String("channel", segmentInfo.InsertChannel))
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s.helper.afterCreateSegment(segmentInfo)
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return segStatus, nil
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}
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func (s *SegmentManager) estimateTotalRows(collectionID UniqueID) (int, error) {
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collMeta, err := s.meta.GetCollection(collectionID)
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if err != nil {
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return -1, err
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}
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return s.estimatePolicy.apply(collMeta.Schema)
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}
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func (s *SegmentManager) DropSegment(ctx context.Context, segmentID UniqueID) {
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sp, _ := trace.StartSpanFromContext(ctx)
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defer sp.Finish()
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s.mu.Lock()
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defer s.mu.Unlock()
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delete(s.stats, segmentID)
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}
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func (s *SegmentManager) SealAllSegments(ctx context.Context, collectionID UniqueID) error {
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sp, _ := trace.StartSpanFromContext(ctx)
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defer sp.Finish()
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s.mu.Lock()
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defer s.mu.Unlock()
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for _, status := range s.stats {
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if status.sealed || status.collectionID != collectionID {
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continue
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}
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if err := s.meta.SealSegment(status.id); err != nil {
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return err
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}
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status.sealed = true
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}
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return nil
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}
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func (s *SegmentManager) GetFlushableSegments(ctx context.Context, channel string,
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t Timestamp) ([]UniqueID, error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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sp, _ := trace.StartSpanFromContext(ctx)
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defer sp.Finish()
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if err := s.tryToSealSegment(t); err != nil {
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return nil, err
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}
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ret := make([]UniqueID, 0)
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for _, segStatus := range s.stats {
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if segStatus.insertChannel != channel {
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continue
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}
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if s.flushPolicy.apply(segStatus, t) {
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ret = append(ret, segStatus.id)
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}
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}
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return ret, nil
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}
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func (s *SegmentManager) UpdateSegmentStats(stat *internalpb.SegmentStatisticsUpdates) {
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s.mu.Lock()
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defer s.mu.Unlock()
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segment, ok := s.stats[stat.SegmentID]
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if !ok {
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return
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}
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segment.currentRows = stat.NumRows
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}
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// tryToSealSegment applies segment & channel seal policies
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func (s *SegmentManager) tryToSealSegment(ts Timestamp) error {
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channelInfo := make(map[string][]*segmentStatus)
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for _, segStatus := range s.stats {
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channelInfo[segStatus.insertChannel] = append(channelInfo[segStatus.insertChannel], segStatus)
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if segStatus.sealed {
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continue
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}
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// change shouldSeal to segment seal policy logic
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for _, policy := range s.segmentSealPolicies {
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if policy(segStatus, ts) {
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if err := s.meta.SealSegment(segStatus.id); err != nil {
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return err
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}
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segStatus.sealed = true
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break
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}
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}
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}
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for channel, segs := range channelInfo {
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for _, policy := range s.channelSealPolicies {
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vs := policy(channel, segs, ts)
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for _, seg := range vs {
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if seg.sealed {
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continue
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}
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if err := s.meta.SealSegment(seg.id); err != nil {
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return err
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}
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seg.sealed = true
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}
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}
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}
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return nil
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}
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// func (s *SegmentManager) shouldSeal(segStatus *segmentStatus) (bool, error) {
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// var allocSize int64
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// for _, allocation := range segStatus.allocations {
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// allocSize += allocation.rowNums
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// }
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// ret := s.sealPolicy.apply(segStatus.total, segStatus.currentRows, allocSize)
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// return ret, nil
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// }
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// only for test
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func (s *SegmentManager) SealSegment(ctx context.Context, segmentID UniqueID) error {
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sp, _ := trace.StartSpanFromContext(ctx)
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defer sp.Finish()
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s.mu.Lock()
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defer s.mu.Unlock()
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if err := s.meta.SealSegment(segmentID); err != nil {
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return err
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}
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s.stats[segmentID].sealed = true
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return nil
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}
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func createNewSegmentHelper(stream msgstream.MsgStream) allocHelper {
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h := allocHelper{}
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h.afterCreateSegment = func(segment *datapb.SegmentInfo) error {
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infoMsg := &msgstream.SegmentInfoMsg{
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BaseMsg: msgstream.BaseMsg{
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HashValues: []uint32{0},
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},
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SegmentMsg: datapb.SegmentMsg{
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Base: &commonpb.MsgBase{
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MsgType: commonpb.MsgType_SegmentInfo,
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MsgID: 0,
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Timestamp: 0,
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SourceID: Params.NodeID,
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},
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Segment: segment,
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},
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}
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msgPack := &msgstream.MsgPack{
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Msgs: []msgstream.TsMsg{infoMsg},
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}
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if err := stream.Produce(msgPack); err != nil {
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return err
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}
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return nil
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}
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return h
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}
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