mirror of
https://gitee.com/milvus-io/milvus.git
synced 2024-12-01 11:29:48 +08:00
457 lines
14 KiB
Go
457 lines
14 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 datacoord
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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/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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const segmentMaxLifetime = 24 * time.Hour
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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) ([]*Allocation, 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 sealed all segmetns of collection with collectionID and return sealed segments
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SealAllSegments(ctx context.Context, collectionID UniqueID) ([]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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// ExpireAllocations notify segment status to expire old allocations
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ExpireAllocations(channel string, ts Timestamp) error
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}
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// allcation entry for segment Allocation record
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type Allocation struct {
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SegmentID UniqueID
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NumOfRows int64
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ExpireTime Timestamp
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}
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// SegmentManager handles segment related logic
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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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segments []UniqueID
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estimatePolicy calUpperLimitPolicy
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allocPolicy AllocatePolicy
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segmentSealPolicies []segmentSealPolicy
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channelSealPolicies []channelSealPolicy
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flushPolicy flushPolicy
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allocPool sync.Pool
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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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// allocOption allction option applies to `SegmentManager`
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type allocOption interface {
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apply(manager *SegmentManager)
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}
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// allocFunc function shortcut for allocOption
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type allocFunc func(manager *SegmentManager)
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// implement allocOption
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func (f allocFunc) apply(manager *SegmentManager) {
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f(manager)
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}
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// get allocOption with allocHelper setting
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func withAllocHelper(helper allocHelper) allocOption {
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return allocFunc(func(manager *SegmentManager) { manager.helper = helper })
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}
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// get default allocHelper, which does nothing
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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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// get allocOption with estimatePolicy
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func withCalUpperLimitPolicy(policy calUpperLimitPolicy) allocOption {
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return allocFunc(func(manager *SegmentManager) { manager.estimatePolicy = policy })
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}
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// get allocOption with allocPolicy
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func withAllocPolicy(policy AllocatePolicy) allocOption {
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return allocFunc(func(manager *SegmentManager) { manager.allocPolicy = policy })
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}
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// get allocOption with segmentSealPolicies
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func withSegmentSealPolices(policies ...segmentSealPolicy) allocOption {
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return allocFunc(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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// get allocOption with channelSealPolicies
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func withChannelSealPolices(policies ...channelSealPolicy) allocOption {
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return allocFunc(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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// get allocOption with flushPolicy
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func withFlushPolicy(policy flushPolicy) allocOption {
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return allocFunc(func(manager *SegmentManager) { manager.flushPolicy = policy })
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}
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func defaultCalUpperLimitPolicy() calUpperLimitPolicy {
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return calBySchemaPolicy
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}
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func defaultAlocatePolicy() AllocatePolicy {
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return AllocatePolicyV1
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}
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func defaultSegmentSealPolicy() []segmentSealPolicy {
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return []segmentSealPolicy{
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sealByLifetimePolicy(segmentMaxLifetime),
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getSegmentCapacityPolicy(Params.SegmentSealProportion),
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}
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}
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func defaultFlushPolicy() flushPolicy {
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return flushPolicyV1
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}
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// newSegmentManager should be the only way to retrieve SegmentManager
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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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segments: make([]UniqueID, 0),
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estimatePolicy: defaultCalUpperLimitPolicy(),
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allocPolicy: defaultAlocatePolicy(),
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segmentSealPolicies: 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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allocPool: sync.Pool{
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New: func() interface{} {
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return &Allocation{}
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},
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},
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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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// loadSegmentsFromMeta generate corresponding segment status for each segment from meta
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func (s *SegmentManager) loadSegmentsFromMeta() {
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segments := s.meta.GetUnFlushedSegments()
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segmentsID := make([]UniqueID, 0, len(segments))
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for _, segment := range segments {
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segmentsID = append(segmentsID, segment.GetID())
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}
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s.segments = segmentsID
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}
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// getAllocation unified way to retrieve allocation struct
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func (s *SegmentManager) getAllocation(numOfRows int64) *Allocation {
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v := s.allocPool.Get()
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if v == nil {
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return &Allocation{
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NumOfRows: numOfRows,
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}
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}
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a, ok := v.(*Allocation)
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if !ok {
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a = &Allocation{}
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}
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a.NumOfRows = numOfRows
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return a
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}
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// putAllocation put allocation for recycling
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func (s *SegmentManager) putAllocation(a *Allocation) {
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s.allocPool.Put(a)
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}
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// AllocSegment allocate segment per request collcation, partication, channel and rows
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func (s *SegmentManager) AllocSegment(ctx context.Context, collectionID UniqueID,
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partitionID UniqueID, channelName string, requestRows int64) ([]*Allocation, 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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// filter segments
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segments := make([]*SegmentInfo, 0)
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for _, segmentID := range s.segments {
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segment := s.meta.GetSegment(segmentID)
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if segment == nil {
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log.Warn("Failed to get seginfo from meta", zap.Int64("id", segmentID))
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continue
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}
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if segment.State == commonpb.SegmentState_Sealed || segment.CollectionID != collectionID ||
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segment.PartitionID != partitionID || segment.InsertChannel != channelName {
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continue
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}
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segments = append(segments, segment)
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}
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// apply allocate policy
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maxCountPerSegment, err := s.estimateMaxNumOfRows(collectionID)
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if err != nil {
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return nil, err
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}
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newSegmentAllocations, existedSegmentAllocations := s.allocPolicy(segments,
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requestRows, int64(maxCountPerSegment))
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// create new segments and add allocations
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expireTs, err := s.genExpireTs(ctx)
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if err != nil {
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return nil, err
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}
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for _, allocation := range newSegmentAllocations {
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segment, err := s.openNewSegment(ctx, collectionID, partitionID, channelName)
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if err != nil {
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return nil, err
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}
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allocation.ExpireTime = expireTs
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allocation.SegmentID = segment.GetID()
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if err := s.meta.AddAllocation(segment.GetID(), allocation); err != nil {
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return nil, err
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}
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}
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for _, allocation := range existedSegmentAllocations {
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allocation.ExpireTime = expireTs
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if err := s.meta.AddAllocation(allocation.SegmentID, allocation); err != nil {
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return nil, err
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}
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}
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allocations := append(newSegmentAllocations, existedSegmentAllocations...)
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return allocations, nil
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}
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func (s *SegmentManager) genExpireTs(ctx context.Context) (Timestamp, error) {
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ts, err := s.allocator.allocTimestamp(ctx)
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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.SegAssignmentExpiration) * 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) (*SegmentInfo, 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(ctx)
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if err != nil {
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return nil, err
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}
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maxNumOfRows, err := s.estimateMaxNumOfRows(collectionID)
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if err != nil {
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return nil, err
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}
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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(maxNumOfRows),
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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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segment := NewSegmentInfo(segmentInfo)
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if err := s.meta.AddSegment(segment); err != nil {
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return nil, err
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}
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s.segments = append(s.segments, id)
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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", maxNumOfRows),
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zap.String("Channel", segmentInfo.InsertChannel))
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s.helper.afterCreateSegment(segmentInfo)
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return segment, nil
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}
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func (s *SegmentManager) estimateMaxNumOfRows(collectionID UniqueID) (int, error) {
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collMeta := s.meta.GetCollection(collectionID)
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if collMeta == nil {
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return -1, fmt.Errorf("Failed to get collection %d", collectionID)
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}
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return s.estimatePolicy(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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for i, id := range s.segments {
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if id == segmentID {
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s.segments = append(s.segments[:i], s.segments[i+1:]...)
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break
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}
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}
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segment := s.meta.GetSegment(segmentID)
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if segment == nil {
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log.Warn("failed to get segment", zap.Int64("id", segmentID))
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}
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s.meta.SetAllocations(segmentID, []*Allocation{})
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for _, allocation := range segment.allocations {
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s.putAllocation(allocation)
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}
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}
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func (s *SegmentManager) SealAllSegments(ctx context.Context, collectionID UniqueID) ([]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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ret := make([]UniqueID, 0)
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for _, id := range s.segments {
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info := s.meta.GetSegment(id)
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if info == nil {
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log.Warn("Failed to get seg info from meta", zap.Int64("id", id))
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continue
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}
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if info.CollectionID != collectionID {
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continue
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}
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if info.State == commonpb.SegmentState_Sealed {
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ret = append(ret, id)
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continue
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}
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if err := s.meta.SetState(id, commonpb.SegmentState_Sealed); err != nil {
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return nil, err
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}
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ret = append(ret, id)
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}
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return ret, 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, channel); err != nil {
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return nil, err
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}
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ret := make([]UniqueID, 0, len(s.segments))
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for _, id := range s.segments {
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info := s.meta.GetSegment(id)
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if info == nil || info.InsertChannel != channel {
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continue
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}
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if s.flushPolicy(info, t) {
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ret = append(ret, id)
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}
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}
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return ret, nil
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}
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// ExpireAllocations notify segment status to expire old allocations
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func (s *SegmentManager) ExpireAllocations(channel string, ts Timestamp) error {
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s.mu.Lock()
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defer s.mu.Unlock()
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for _, id := range s.segments {
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segment := s.meta.GetSegment(id)
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if segment == nil || segment.InsertChannel != channel {
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continue
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}
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allocations := make([]*Allocation, 0, len(segment.allocations))
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for i := 0; i < len(segment.allocations); i++ {
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if segment.allocations[i].ExpireTime <= ts {
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a := segment.allocations[i]
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s.putAllocation(a)
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} else {
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allocations = append(allocations, segment.allocations[i])
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}
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}
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s.meta.SetAllocations(segment.GetID(), allocations)
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}
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return nil
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}
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// tryToSealSegment applies segment & channel seal policies
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func (s *SegmentManager) tryToSealSegment(ts Timestamp, channel string) error {
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channelInfo := make(map[string][]*SegmentInfo)
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for _, id := range s.segments {
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info := s.meta.GetSegment(id)
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if info == nil || info.InsertChannel != channel {
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continue
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}
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channelInfo[info.InsertChannel] = append(channelInfo[info.InsertChannel], info)
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if info.State == commonpb.SegmentState_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(info, ts) {
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if err := s.meta.SetState(id, commonpb.SegmentState_Sealed); err != nil {
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return err
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}
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break
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}
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}
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}
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for channel, segmentInfos := range channelInfo {
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for _, policy := range s.channelSealPolicies {
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vs := policy(channel, segmentInfos, ts)
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for _, info := range vs {
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if info.State == commonpb.SegmentState_Sealed {
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continue
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}
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if err := s.meta.SetState(info.GetID(), commonpb.SegmentState_Sealed); err != nil {
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return err
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}
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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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