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612 lines
20 KiB
Go
612 lines
20 KiB
Go
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// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "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
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package delegator
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import (
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"context"
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"fmt"
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"math/rand"
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"github.com/cockroachdb/errors"
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"github.com/milvus-io/milvus-proto/go-api/commonpb"
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"github.com/milvus-io/milvus-proto/go-api/msgpb"
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"github.com/milvus-io/milvus/internal/common"
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"github.com/milvus-io/milvus/internal/mq/msgstream"
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"github.com/milvus-io/milvus/internal/mq/msgstream/mqwrapper"
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"github.com/milvus-io/milvus/internal/proto/querypb"
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"github.com/milvus-io/milvus/internal/proto/segcorepb"
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"github.com/milvus-io/milvus/internal/querynodev2/cluster"
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"github.com/milvus-io/milvus/internal/querynodev2/delegator/deletebuffer"
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"github.com/milvus-io/milvus/internal/querynodev2/pkoracle"
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"github.com/milvus-io/milvus/internal/querynodev2/segments"
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"github.com/milvus-io/milvus/internal/storage"
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"github.com/milvus-io/milvus/internal/util/commonpbutil"
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"github.com/milvus-io/milvus/internal/util/funcutil"
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"github.com/milvus-io/milvus/internal/util/merr"
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"github.com/milvus-io/milvus/internal/util/paramtable"
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"github.com/milvus-io/milvus/internal/util/retry"
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"github.com/milvus-io/milvus/internal/util/tsoutil"
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"github.com/milvus-io/milvus/internal/util/typeutil"
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"github.com/samber/lo"
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"go.uber.org/zap"
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"golang.org/x/sync/errgroup"
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)
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// delegator data related part
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// InsertData
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type InsertData struct {
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RowIDs []int64
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PrimaryKeys []storage.PrimaryKey
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Timestamps []uint64
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InsertRecord *segcorepb.InsertRecord
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StartPosition *msgpb.MsgPosition
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PartitionID int64
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}
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type DeleteData struct {
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PartitionID int64
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PrimaryKeys []storage.PrimaryKey
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Timestamps []uint64
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RowCount int64
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}
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// Append appends another delete data into this one.
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func (d *DeleteData) Append(ad DeleteData) {
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d.PrimaryKeys = append(d.PrimaryKeys, ad.PrimaryKeys...)
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d.Timestamps = append(d.Timestamps, ad.Timestamps...)
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d.RowCount += ad.RowCount
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}
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func (sd *shardDelegator) newGrowing(segmentID int64, insertData *InsertData) segments.Segment {
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log := sd.getLogger(context.Background()).With(zap.Int64("segmentID", segmentID))
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// try add partition
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if sd.collection.GetLoadType() == loadTypeCollection {
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sd.collection.AddPartition(insertData.PartitionID)
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}
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segment, err := segments.NewSegment(sd.collection, segmentID, insertData.PartitionID, sd.collectionID, sd.vchannelName, segments.SegmentTypeGrowing, 0, insertData.StartPosition, insertData.StartPosition)
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if err != nil {
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log.Error("failed to create new segment", zap.Error(err))
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panic(err)
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}
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sd.pkOracle.Register(segment, paramtable.GetNodeID())
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sd.segmentManager.Put(segments.SegmentTypeGrowing, segment)
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sd.addGrowing(SegmentEntry{
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NodeID: paramtable.GetNodeID(),
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SegmentID: segmentID,
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PartitionID: insertData.PartitionID,
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Version: 0,
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})
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return segment
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}
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// ProcessInsert handles insert data in delegator.
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func (sd *shardDelegator) ProcessInsert(insertRecords map[int64]*InsertData) {
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log := sd.getLogger(context.Background())
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for segmentID, insertData := range insertRecords {
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growing := sd.segmentManager.GetGrowing(segmentID)
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if growing == nil {
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growing = sd.newGrowing(segmentID, insertData)
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}
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err := growing.Insert(insertData.RowIDs, insertData.Timestamps, insertData.InsertRecord)
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if err != nil {
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log.Error("failed to insert data into growing segment",
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zap.Int64("segmentID", segmentID),
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zap.Error(err),
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)
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// panic here, insert failure
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panic(err)
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}
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growing.UpdateBloomFilter(insertData.PrimaryKeys)
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log.Debug("insert into growing segment",
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zap.Int64("collectionID", growing.Collection()),
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zap.Int64("segmentID", segmentID),
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zap.Int("rowCount", len(insertData.RowIDs)),
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zap.Uint64("maxTimestamp", insertData.Timestamps[len(insertData.Timestamps)-1]),
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)
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}
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}
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// ProcessDelete handles delete data in delegator.
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// delegator puts deleteData into buffer first,
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// then dispatch data to segments acoording to the result of pkOracle.
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func (sd *shardDelegator) ProcessDelete(deleteData []*DeleteData, ts uint64) {
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// block load segment handle delete buffer
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sd.deleteMut.Lock()
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defer sd.deleteMut.Unlock()
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log := sd.getLogger(context.Background())
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log.Debug("start to process delete", zap.Uint64("ts", ts))
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// add deleteData into buffer.
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cacheItems := make([]deletebuffer.BufferItem, 0, len(deleteData))
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for _, entry := range deleteData {
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cacheItems = append(cacheItems, deletebuffer.BufferItem{
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PartitionID: entry.PartitionID,
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DeleteData: storage.DeleteData{
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Pks: entry.PrimaryKeys,
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Tss: entry.Timestamps,
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RowCount: entry.RowCount,
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},
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})
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}
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sd.deleteBuffer.Put(&deletebuffer.Item{
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Ts: ts,
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Data: cacheItems,
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})
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// segment => delete data
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delRecords := make(map[int64]DeleteData)
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for _, data := range deleteData {
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for i, pk := range data.PrimaryKeys {
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segmentIDs, err := sd.pkOracle.Get(pk, pkoracle.WithPartitionID(data.PartitionID))
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if err != nil {
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log.Warn("failed to get delete candidates for pk", zap.Any("pk", pk.GetValue()))
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continue
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}
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for _, segmentID := range segmentIDs {
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delRecord := delRecords[segmentID]
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delRecord.PrimaryKeys = append(delRecord.PrimaryKeys, pk)
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delRecord.Timestamps = append(delRecord.Timestamps, data.Timestamps[i])
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delRecord.RowCount++
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delRecords[segmentID] = delRecord
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}
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}
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}
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offlineSegments := typeutil.NewConcurrentSet[int64]()
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sealed, growing, version := sd.distribution.GetCurrent()
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eg, ctx := errgroup.WithContext(context.Background())
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for _, entry := range sealed {
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entry := entry
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eg.Go(func() error {
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worker, err := sd.workerManager.GetWorker(entry.NodeID)
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if err != nil {
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log.Warn("failed to get worker",
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zap.Int64("nodeID", paramtable.GetNodeID()),
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zap.Error(err),
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)
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// skip if node down
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// delete will be processed after loaded again
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return nil
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}
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offlineSegments.Upsert(sd.applyDelete(ctx, entry.NodeID, worker, delRecords, entry.Segments)...)
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return nil
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})
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}
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if len(growing) > 0 {
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eg.Go(func() error {
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worker, err := sd.workerManager.GetWorker(paramtable.GetNodeID())
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if err != nil {
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log.Error("failed to get worker(local)",
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zap.Int64("nodeID", paramtable.GetNodeID()),
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zap.Error(err),
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)
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// panic here, local worker shall not have error
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panic(err)
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}
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offlineSegments.Upsert(sd.applyDelete(ctx, paramtable.GetNodeID(), worker, delRecords, growing)...)
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return nil
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})
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}
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// not error return in apply delete
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_ = eg.Wait()
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sd.distribution.FinishUsage(version)
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offlineSegIDs := offlineSegments.Collect()
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if len(offlineSegIDs) > 0 {
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log.Warn("failed to apply delete, mark segment offline", zap.Int64s("offlineSegments", offlineSegIDs))
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sd.markSegmentOffline(offlineSegIDs...)
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}
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}
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// applyDelete handles delete record and apply them to corresponding workers.
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func (sd *shardDelegator) applyDelete(ctx context.Context, nodeID int64, worker cluster.Worker, delRecords map[int64]DeleteData, entries []SegmentEntry) []int64 {
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var offlineSegments []int64
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log := sd.getLogger(ctx)
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for _, segmentEntry := range entries {
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log := log.With(
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zap.Int64("segmentID", segmentEntry.SegmentID),
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zap.Int64("workerID", nodeID),
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)
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delRecord, ok := delRecords[segmentEntry.SegmentID]
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if ok {
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log.Debug("delegator plan to applyDelete via worker")
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err := retry.Do(ctx, func() error {
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err := worker.Delete(ctx, &querypb.DeleteRequest{
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Base: commonpbutil.NewMsgBase(commonpbutil.WithTargetID(nodeID)),
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CollectionId: sd.collectionID,
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PartitionId: segmentEntry.PartitionID,
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VchannelName: sd.vchannelName,
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SegmentId: segmentEntry.SegmentID,
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PrimaryKeys: storage.ParsePrimaryKeys2IDs(delRecord.PrimaryKeys),
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Timestamps: delRecord.Timestamps,
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})
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if errors.Is(err, merr.ErrSegmentNotFound) {
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log.Warn("try to delete data of released segment")
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return nil
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} else if err != nil {
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log.Warn("worker failed to delete on segment",
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zap.Error(err),
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)
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return err
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}
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return nil
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}, retry.Attempts(10))
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if err != nil {
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log.Warn("apply delete for segment failed, marking it offline")
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offlineSegments = append(offlineSegments, segmentEntry.SegmentID)
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}
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}
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}
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return offlineSegments
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}
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// markSegmentOffline makes segment go offline and waits for QueryCoord to fix.
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func (sd *shardDelegator) markSegmentOffline(segmentIDs ...int64) {
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sd.distribution.AddOfflines(segmentIDs...)
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}
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// addGrowing add growing segment record for delegator.
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func (sd *shardDelegator) addGrowing(entries ...SegmentEntry) {
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log := sd.getLogger(context.Background())
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log.Info("add growing segments to delegator", zap.Int64s("segmentIDs", lo.Map(entries, func(entry SegmentEntry, _ int) int64 {
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return entry.SegmentID
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})))
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sd.distribution.AddGrowing(entries...)
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}
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// LoadGrowing load growing segments locally.
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func (sd *shardDelegator) LoadGrowing(ctx context.Context, infos []*querypb.SegmentLoadInfo, version int64) error {
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log := sd.getLogger(ctx)
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loaded, err := sd.loader.Load(ctx, sd.collectionID, segments.SegmentTypeGrowing, version, infos...)
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if err != nil {
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log.Warn("failed to load growing segment", zap.Error(err))
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for _, segment := range loaded {
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segments.DeleteSegment(segment.(*segments.LocalSegment))
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}
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return err
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}
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for _, candidate := range loaded {
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sd.pkOracle.Register(candidate, paramtable.GetNodeID())
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}
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sd.segmentManager.Put(segments.SegmentTypeGrowing, loaded...)
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sd.addGrowing(lo.Map(loaded, func(segment segments.Segment, _ int) SegmentEntry {
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return SegmentEntry{
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NodeID: paramtable.GetNodeID(),
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SegmentID: segment.ID(),
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PartitionID: segment.Partition(),
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Version: version,
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}
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})...)
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return nil
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}
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// LoadSegments load segments local or remotely depends on the target node.
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func (sd *shardDelegator) LoadSegments(ctx context.Context, req *querypb.LoadSegmentsRequest) error {
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log := sd.getLogger(ctx)
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targetNodeID := req.GetDstNodeID()
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// add common log fields
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log = log.With(
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zap.Int64("workID", req.GetDstNodeID()),
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zap.Int64s("segments", lo.Map(req.GetInfos(), func(info *querypb.SegmentLoadInfo, _ int) int64 { return info.GetSegmentID() })),
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)
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worker, err := sd.workerManager.GetWorker(targetNodeID)
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if err != nil {
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log.Warn("delegator failed to find worker", zap.Error(err))
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return err
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}
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// load bloom filter only when candidate not exists
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infos := lo.Filter(req.GetInfos(), func(info *querypb.SegmentLoadInfo, _ int) bool {
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return !sd.pkOracle.Exists(pkoracle.NewCandidateKey(info.GetSegmentID(), info.GetPartitionID(), commonpb.SegmentState_Sealed), targetNodeID)
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})
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candidates, err := sd.loader.LoadBloomFilterSet(ctx, req.GetCollectionID(), req.GetVersion(), infos...)
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if err != nil {
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log.Warn("failed to load bloom filter set for segment", zap.Error(err))
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return err
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}
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req.Base.TargetID = req.GetDstNodeID()
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log.Info("worker loads segments...")
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err = worker.LoadSegments(ctx, req)
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if err != nil {
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log.Warn("worker failed to load segments", zap.Error(err))
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return err
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}
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log.Info("work loads segments done")
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log.Info("load delete...")
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err = sd.loadStreamDelete(ctx, candidates, infos, targetNodeID, worker)
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if err != nil {
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log.Warn("load stream delete failed", zap.Error(err))
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return err
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}
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log.Info("load delete done")
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// alter distribution
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entries := lo.Map(req.GetInfos(), func(info *querypb.SegmentLoadInfo, _ int) SegmentEntry {
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return SegmentEntry{
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SegmentID: info.GetSegmentID(),
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PartitionID: info.GetPartitionID(),
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NodeID: req.GetDstNodeID(),
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Version: req.GetVersion(),
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}
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})
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removed := sd.distribution.AddDistributions(entries...)
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// call worker release async
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if len(removed) > 0 {
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go func() {
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worker, err := sd.workerManager.GetWorker(paramtable.GetNodeID())
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if err != nil {
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log.Warn("failed to get local worker when try to release related growing", zap.Error(err))
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return
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}
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err = worker.ReleaseSegments(context.Background(), &querypb.ReleaseSegmentsRequest{
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Base: commonpbutil.NewMsgBase(commonpbutil.WithTargetID(paramtable.GetNodeID())),
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CollectionID: sd.collectionID,
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NodeID: paramtable.GetNodeID(),
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Scope: querypb.DataScope_Streaming,
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SegmentIDs: removed,
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Shard: sd.vchannelName,
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NeedTransfer: false,
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})
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if err != nil {
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log.Warn("failed to call release segments(local)", zap.Error(err))
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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 (sd *shardDelegator) loadStreamDelete(ctx context.Context, candidates []*pkoracle.BloomFilterSet, infos []*querypb.SegmentLoadInfo,
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targetNodeID int64, worker cluster.Worker) error {
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log := sd.getLogger(ctx)
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sd.deleteMut.Lock()
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defer sd.deleteMut.Unlock()
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idCandidates := lo.SliceToMap(candidates, func(candidate *pkoracle.BloomFilterSet) (int64, *pkoracle.BloomFilterSet) {
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return candidate.ID(), candidate
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})
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// apply buffered delete for new segments
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// no goroutines here since qnv2 has no load merging logic
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for _, info := range infos {
|
||
|
candidate := idCandidates[info.GetSegmentID()]
|
||
|
|
||
|
deleteData := &storage.DeleteData{}
|
||
|
// start position is dml position for segment
|
||
|
// if this position is before deleteBuffer's safe ts, it means some delete shall be read from msgstream
|
||
|
if info.GetEndPosition().GetTimestamp() < sd.deleteBuffer.SafeTs() {
|
||
|
log.Info("load delete from stream...")
|
||
|
var err error
|
||
|
deleteData, err = sd.readDeleteFromMsgstream(ctx, info.GetEndPosition(), sd.deleteBuffer.SafeTs(), candidate)
|
||
|
if err != nil {
|
||
|
log.Warn("failed to read delete data from msgstream", zap.Error(err))
|
||
|
return err
|
||
|
}
|
||
|
log.Info("load delete from stream done")
|
||
|
}
|
||
|
|
||
|
// list buffered delete
|
||
|
deleteRecords := sd.deleteBuffer.ListAfter(info.GetEndPosition().GetTimestamp())
|
||
|
for _, entry := range deleteRecords {
|
||
|
for _, record := range entry.Data {
|
||
|
if record.PartitionID != common.InvalidPartitionID && candidate.Partition() != record.PartitionID {
|
||
|
continue
|
||
|
}
|
||
|
for i, pk := range record.DeleteData.Pks {
|
||
|
if candidate.MayPkExist(pk) {
|
||
|
deleteData.Pks = append(deleteData.Pks, pk)
|
||
|
deleteData.Tss = append(deleteData.Tss, record.DeleteData.Tss[i])
|
||
|
deleteData.RowCount++
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
// if delete count not empty, apply
|
||
|
if deleteData.RowCount > 0 {
|
||
|
log.Info("forward delete to worker...", zap.Int64("deleteRowNum", deleteData.RowCount))
|
||
|
err := worker.Delete(ctx, &querypb.DeleteRequest{
|
||
|
Base: commonpbutil.NewMsgBase(commonpbutil.WithTargetID(targetNodeID)),
|
||
|
CollectionId: info.GetCollectionID(),
|
||
|
PartitionId: info.GetPartitionID(),
|
||
|
SegmentId: info.GetSegmentID(),
|
||
|
PrimaryKeys: storage.ParsePrimaryKeys2IDs(deleteData.Pks),
|
||
|
Timestamps: deleteData.Tss,
|
||
|
})
|
||
|
if err != nil {
|
||
|
log.Warn("failed to apply delete when LoadSegment", zap.Error(err))
|
||
|
return err
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// add candidate after load success
|
||
|
for _, candidate := range candidates {
|
||
|
log.Info("register sealed segment bfs into pko candidates",
|
||
|
zap.Int64("segmentID", candidate.ID()),
|
||
|
)
|
||
|
sd.pkOracle.Register(candidate, targetNodeID)
|
||
|
}
|
||
|
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
func (sd *shardDelegator) readDeleteFromMsgstream(ctx context.Context, position *msgpb.MsgPosition, safeTs uint64, candidate *pkoracle.BloomFilterSet) (*storage.DeleteData, error) {
|
||
|
|
||
|
log := sd.getLogger(ctx).With(
|
||
|
zap.String("channel", position.ChannelName),
|
||
|
zap.Int64("segmentID", candidate.ID()),
|
||
|
)
|
||
|
stream, err := sd.factory.NewTtMsgStream(ctx)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
vchannelName := position.ChannelName
|
||
|
pChannelName := funcutil.ToPhysicalChannel(vchannelName)
|
||
|
position.ChannelName = pChannelName
|
||
|
|
||
|
ts, _ := tsoutil.ParseTS(position.Timestamp)
|
||
|
|
||
|
// Random the subname in case we trying to load same delta at the same time
|
||
|
subName := fmt.Sprintf("querynode-delta-loader-%d-%d-%d", paramtable.GetNodeID(), sd.collectionID, rand.Int())
|
||
|
log.Info("from dml check point load delete", zap.Any("position", position), zap.String("subName", subName), zap.Time("positionTs", ts))
|
||
|
stream.AsConsumer([]string{pChannelName}, subName, mqwrapper.SubscriptionPositionUnknown)
|
||
|
|
||
|
err = stream.Seek([]*msgpb.MsgPosition{position})
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
result := &storage.DeleteData{}
|
||
|
hasMore := true
|
||
|
for hasMore {
|
||
|
select {
|
||
|
case <-ctx.Done():
|
||
|
log.Debug("read delta msg from seek position done", zap.Error(ctx.Err()))
|
||
|
return nil, ctx.Err()
|
||
|
case msgPack, ok := <-stream.Chan():
|
||
|
if !ok {
|
||
|
err = fmt.Errorf("stream channel closed, pChannelName=%v, msgID=%v", pChannelName, position.GetMsgID())
|
||
|
log.Warn("fail to read delta msg",
|
||
|
zap.String("pChannelName", pChannelName),
|
||
|
zap.Binary("msgID", position.GetMsgID()),
|
||
|
zap.Error(err),
|
||
|
)
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
if msgPack == nil {
|
||
|
continue
|
||
|
}
|
||
|
|
||
|
for _, tsMsg := range msgPack.Msgs {
|
||
|
if tsMsg.Type() == commonpb.MsgType_Delete {
|
||
|
dmsg := tsMsg.(*msgstream.DeleteMsg)
|
||
|
if dmsg.CollectionID != sd.collectionID || dmsg.GetPartitionID() != candidate.Partition() {
|
||
|
continue
|
||
|
}
|
||
|
|
||
|
for idx, pk := range storage.ParseIDs2PrimaryKeys(dmsg.GetPrimaryKeys()) {
|
||
|
if candidate.MayPkExist(pk) {
|
||
|
result.Pks = append(result.Pks, pk)
|
||
|
result.Tss = append(result.Tss, dmsg.Timestamps[idx])
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// reach safe ts
|
||
|
if safeTs <= msgPack.EndPositions[0].GetTimestamp() {
|
||
|
hasMore = false
|
||
|
break
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return result, nil
|
||
|
}
|
||
|
|
||
|
// ReleaseSegments releases segments local or remotely depends ont the target node.
|
||
|
func (sd *shardDelegator) ReleaseSegments(ctx context.Context, req *querypb.ReleaseSegmentsRequest, force bool) error {
|
||
|
log := sd.getLogger(ctx)
|
||
|
|
||
|
targetNodeID := req.GetNodeID()
|
||
|
// add common log fields
|
||
|
log = log.With(
|
||
|
zap.Int64s("segmentIDs", req.GetSegmentIDs()),
|
||
|
zap.Int64("nodeID", req.GetNodeID()),
|
||
|
zap.String("scope", req.GetScope().String()),
|
||
|
zap.Bool("force", force))
|
||
|
|
||
|
log.Info("delegator start to release segments")
|
||
|
// alter distribution first
|
||
|
var sealed, growing []SegmentEntry
|
||
|
convertSealed := func(segmentID int64, _ int) SegmentEntry {
|
||
|
return SegmentEntry{
|
||
|
SegmentID: segmentID,
|
||
|
NodeID: targetNodeID,
|
||
|
}
|
||
|
}
|
||
|
convertGrowing := func(segmentID int64, _ int) SegmentEntry {
|
||
|
return SegmentEntry{
|
||
|
SegmentID: segmentID,
|
||
|
}
|
||
|
}
|
||
|
switch req.GetScope() {
|
||
|
case querypb.DataScope_All:
|
||
|
sealed = lo.Map(req.GetSegmentIDs(), convertSealed)
|
||
|
growing = lo.Map(req.GetSegmentIDs(), convertGrowing)
|
||
|
case querypb.DataScope_Streaming:
|
||
|
growing = lo.Map(req.GetSegmentIDs(), convertGrowing)
|
||
|
case querypb.DataScope_Historical:
|
||
|
sealed = lo.Map(req.GetSegmentIDs(), convertSealed)
|
||
|
}
|
||
|
|
||
|
signal := sd.distribution.RemoveDistributions(sealed, growing)
|
||
|
// wait cleared signal
|
||
|
<-signal
|
||
|
if len(sealed) > 0 {
|
||
|
sd.pkOracle.Remove(
|
||
|
pkoracle.WithSegmentIDs(lo.Map(sealed, func(entry SegmentEntry, _ int) int64 { return entry.SegmentID })...),
|
||
|
pkoracle.WithSegmentType(commonpb.SegmentState_Sealed),
|
||
|
pkoracle.WithWorkerID(targetNodeID),
|
||
|
)
|
||
|
}
|
||
|
if len(growing) > 0 {
|
||
|
sd.pkOracle.Remove(
|
||
|
pkoracle.WithSegmentIDs(lo.Map(growing, func(entry SegmentEntry, _ int) int64 { return entry.SegmentID })...),
|
||
|
pkoracle.WithSegmentType(commonpb.SegmentState_Growing),
|
||
|
)
|
||
|
}
|
||
|
|
||
|
if !force {
|
||
|
worker, err := sd.workerManager.GetWorker(targetNodeID)
|
||
|
if err != nil {
|
||
|
log.Warn("delegator failed to find worker",
|
||
|
zap.Error(err),
|
||
|
)
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
err = worker.ReleaseSegments(ctx, req)
|
||
|
if err != nil {
|
||
|
log.Warn("worker failed to release segments",
|
||
|
zap.Error(err),
|
||
|
)
|
||
|
}
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
return nil
|
||
|
}
|