mirror of
https://gitee.com/milvus-io/milvus.git
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305 lines
9.1 KiB
Go
305 lines
9.1 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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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 datanode
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import (
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"fmt"
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"sync"
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"sync/atomic"
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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/internalpb"
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"github.com/milvus-io/milvus/internal/proto/schemapb"
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)
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type Replica interface {
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// collection
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getCollectionNum() int
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addCollection(collectionID UniqueID, schema *schemapb.CollectionSchema) error
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removeCollection(collectionID UniqueID) error
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getCollectionByID(collectionID UniqueID) (*Collection, error)
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hasCollection(collectionID UniqueID) bool
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// segment
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addSegment(segmentID UniqueID, collID UniqueID, partitionID UniqueID, channelName string) error
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removeSegment(segmentID UniqueID) error
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hasSegment(segmentID UniqueID) bool
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updateStatistics(segmentID UniqueID, numRows int64) error
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getSegmentStatisticsUpdates(segmentID UniqueID) (*internalpb.SegmentStatisticsUpdates, error)
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getSegmentByID(segmentID UniqueID) (*Segment, error)
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bufferAutoFlushBinlogPaths(segmentID UniqueID, field2Path map[UniqueID]string) error
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getBufferPaths(segID UniqueID) (map[UniqueID][]string, error)
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getChannelName(segID UniqueID) (string, error)
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setStartPositions(segmentID UniqueID, startPos []*internalpb.MsgPosition) error
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setEndPositions(segmentID UniqueID, endPos []*internalpb.MsgPosition) error
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getSegmentPositions(segID UniqueID) ([]*internalpb.MsgPosition, []*internalpb.MsgPosition)
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}
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// Segment is the data structure of segments in data node replica.
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type Segment struct {
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segmentID UniqueID
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collectionID UniqueID
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partitionID UniqueID
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numRows int64
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memorySize int64
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isNew atomic.Value // bool
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channelName string
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field2Paths map[UniqueID][]string // fieldID to binlog paths, only auto-flushed paths will be buffered.
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}
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// CollectionSegmentReplica is the data replication of persistent data in datanode.
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// It implements `Replica` interface.
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type CollectionSegmentReplica struct {
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mu sync.RWMutex
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segments map[UniqueID]*Segment
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collections map[UniqueID]*Collection
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posMu sync.Mutex
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startPositions map[UniqueID][]*internalpb.MsgPosition
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endPositions map[UniqueID][]*internalpb.MsgPosition
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}
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var _ Replica = &CollectionSegmentReplica{}
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func newReplica() Replica {
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segments := make(map[UniqueID]*Segment)
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collections := make(map[UniqueID]*Collection)
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var replica Replica = &CollectionSegmentReplica{
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segments: segments,
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collections: collections,
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startPositions: make(map[UniqueID][]*internalpb.MsgPosition),
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endPositions: make(map[UniqueID][]*internalpb.MsgPosition),
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}
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return replica
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}
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func (replica *CollectionSegmentReplica) getChannelName(segID UniqueID) (string, error) {
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replica.mu.RLock()
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defer replica.mu.RUnlock()
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seg, ok := replica.segments[segID]
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if !ok {
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return "", fmt.Errorf("Cannot find segment, id = %v", segID)
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}
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return seg.channelName, nil
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}
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// bufferAutoFlushBinlogPaths buffers binlog paths generated by auto-flush
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func (replica *CollectionSegmentReplica) bufferAutoFlushBinlogPaths(segID UniqueID, field2Path map[UniqueID]string) error {
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replica.mu.RLock()
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defer replica.mu.RUnlock()
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seg, ok := replica.segments[segID]
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if !ok {
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return fmt.Errorf("Cannot find segment, id = %v", segID)
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}
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for fieldID, path := range field2Path {
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buffpaths, ok := seg.field2Paths[fieldID]
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if !ok {
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buffpaths = make([]string, 0)
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}
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buffpaths = append(buffpaths, path)
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seg.field2Paths[fieldID] = buffpaths
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}
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log.Info("Buffer auto flush binlog paths", zap.Int64("segment ID", segID))
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return nil
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}
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func (replica *CollectionSegmentReplica) getBufferPaths(segID UniqueID) (map[UniqueID][]string, error) {
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replica.mu.RLock()
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defer replica.mu.RUnlock()
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if seg, ok := replica.segments[segID]; ok {
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return seg.field2Paths, nil
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}
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return nil, fmt.Errorf("Cannot find segment, id = %v", segID)
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}
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func (replica *CollectionSegmentReplica) getSegmentByID(segmentID UniqueID) (*Segment, error) {
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replica.mu.RLock()
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defer replica.mu.RUnlock()
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if seg, ok := replica.segments[segmentID]; ok {
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return seg, nil
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}
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return nil, fmt.Errorf("Cannot find segment, id = %v", segmentID)
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}
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// `addSegment` add a new segment into replica when data node see the segment
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func (replica *CollectionSegmentReplica) addSegment(
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segmentID UniqueID,
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collID UniqueID,
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partitionID UniqueID,
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channelName string) error {
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replica.mu.Lock()
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defer replica.mu.Unlock()
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log.Debug("Add Segment", zap.Int64("Segment ID", segmentID))
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seg := &Segment{
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segmentID: segmentID,
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collectionID: collID,
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partitionID: partitionID,
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channelName: channelName,
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field2Paths: make(map[UniqueID][]string),
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}
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seg.isNew.Store(true)
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replica.segments[segmentID] = seg
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return nil
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}
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func (replica *CollectionSegmentReplica) removeSegment(segmentID UniqueID) error {
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replica.mu.Lock()
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defer replica.mu.Unlock()
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delete(replica.segments, segmentID)
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return nil
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}
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func (replica *CollectionSegmentReplica) hasSegment(segmentID UniqueID) bool {
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replica.mu.RLock()
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defer replica.mu.RUnlock()
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_, ok := replica.segments[segmentID]
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return ok
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}
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// `updateStatistics` updates the number of rows of a segment in replica.
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func (replica *CollectionSegmentReplica) updateStatistics(segmentID UniqueID, numRows int64) error {
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replica.mu.Lock()
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defer replica.mu.Unlock()
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if seg, ok := replica.segments[segmentID]; ok {
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log.Debug("updating segment", zap.Int64("Segment ID", segmentID), zap.Int64("numRows", numRows))
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seg.memorySize = 0
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seg.numRows += numRows
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return nil
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}
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return fmt.Errorf("There's no segment %v", segmentID)
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}
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// `getSegmentStatisticsUpdates` gives current segment's statistics updates.
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func (replica *CollectionSegmentReplica) getSegmentStatisticsUpdates(segmentID UniqueID) (*internalpb.SegmentStatisticsUpdates, error) {
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replica.mu.Lock()
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defer replica.mu.Unlock()
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if seg, ok := replica.segments[segmentID]; ok {
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updates := &internalpb.SegmentStatisticsUpdates{
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SegmentID: segmentID,
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MemorySize: seg.memorySize,
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NumRows: seg.numRows,
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}
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return updates, nil
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}
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return nil, fmt.Errorf("Error, there's no segment %v", segmentID)
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}
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// --- collection ---
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func (replica *CollectionSegmentReplica) getCollectionNum() int {
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replica.mu.RLock()
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defer replica.mu.RUnlock()
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return len(replica.collections)
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}
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func (replica *CollectionSegmentReplica) addCollection(collectionID UniqueID, schema *schemapb.CollectionSchema) error {
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replica.mu.Lock()
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defer replica.mu.Unlock()
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if _, ok := replica.collections[collectionID]; ok {
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return fmt.Errorf("Create an existing collection=%s", schema.GetName())
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}
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newCollection, err := newCollection(collectionID, schema)
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if err != nil {
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return err
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}
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replica.collections[collectionID] = newCollection
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log.Debug("Create collection", zap.String("collection name", newCollection.GetName()))
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return nil
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}
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func (replica *CollectionSegmentReplica) removeCollection(collectionID UniqueID) error {
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replica.mu.Lock()
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defer replica.mu.Unlock()
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delete(replica.collections, collectionID)
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return nil
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}
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func (replica *CollectionSegmentReplica) getCollectionByID(collectionID UniqueID) (*Collection, error) {
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replica.mu.RLock()
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defer replica.mu.RUnlock()
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coll, ok := replica.collections[collectionID]
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if !ok {
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return nil, fmt.Errorf("Cannot get collection %d by ID: not exist", collectionID)
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}
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return coll, nil
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}
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func (replica *CollectionSegmentReplica) hasCollection(collectionID UniqueID) bool {
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replica.mu.RLock()
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defer replica.mu.RUnlock()
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_, ok := replica.collections[collectionID]
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return ok
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}
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// setStartPositions set segment `Start Position` - means the `startPositions` from the MsgPack when segment is first found
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func (replica *CollectionSegmentReplica) setStartPositions(segID UniqueID, startPositions []*internalpb.MsgPosition) error {
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replica.posMu.Lock()
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defer replica.posMu.Unlock()
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replica.startPositions[segID] = startPositions
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return nil
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}
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// setEndPositions set segment `End Position` - means the `endPositions` from the MsgPack when segment need to be flushed
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func (replica *CollectionSegmentReplica) setEndPositions(segID UniqueID, endPositions []*internalpb.MsgPosition) error {
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replica.posMu.Lock()
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defer replica.posMu.Unlock()
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replica.endPositions[segID] = endPositions
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return nil
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}
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// getSegmentPositions returns stored segment start-end Positions
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// To te Noted: start/end positions are NOT start&end position from one single MsgPack, they are from different MsgPack!
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// see setStartPositions, setEndPositions comment
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func (replica *CollectionSegmentReplica) getSegmentPositions(segID UniqueID) ([]*internalpb.MsgPosition, []*internalpb.MsgPosition) {
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replica.posMu.Lock()
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defer replica.posMu.Unlock()
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startPos := replica.startPositions[segID]
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endPos := replica.endPositions[segID]
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return startPos, endPos
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}
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