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forward_merger.go
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forward_merger.go
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// Licensed to LinDB under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. LinDB licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package tagindex
import (
"github.com/lindb/roaring"
"github.com/lindb/lindb/kv"
)
var SeriesForwardMerger kv.MergerType = "SeriesForwardMerger"
// init registers series forward merger create function
func init() {
kv.RegisterMerger(SeriesForwardMerger, NewForwardMerger)
}
// forwardMerger implements kv.Merger for merging forward index data for each tag key
type forwardMerger struct {
forwardFlusher ForwardFlusher
kvFlusher kv.Flusher
}
func (m *forwardMerger) Init(_ map[string]interface{}) {}
// NewForwardMerger creates a forward merger
func NewForwardMerger(flusher kv.Flusher) (kv.Merger, error) {
forwardFlusher, err := NewForwardFlusher(flusher)
if err != nil {
return nil, err
}
return &forwardMerger{
kvFlusher: flusher,
forwardFlusher: forwardFlusher,
}, nil
}
// Merge merges the multi forward index data into a forward index for same tag key id
func (m *forwardMerger) Merge(key uint32, values [][]byte) error {
var scanners []*tagForwardScanner
seriesIDs := roaring.New() // target merged series ids
// 1. prepare tag forward scanner
for _, value := range values {
reader, err := NewTagForwardReader(value)
if err != nil {
return err
}
seriesIDs.Or(reader.GetSeriesIDs())
scanners = append(scanners, newTagForwardScanner(reader))
}
// 2. merge forward index by roaring container
highKeys := seriesIDs.GetHighKeys()
m.forwardFlusher.PrepareTagKey(key)
for idx, highKey := range highKeys {
container := seriesIDs.GetContainerAtIndex(idx)
it := container.PeekableIterator()
var tagValueIDs []uint32
for it.HasNext() {
lowSeriesID := it.Next()
// scan index data then merge tag value ids, sort by series id
for _, scanner := range scanners {
tagValueIDs = scanner.scan(highKey, lowSeriesID, tagValueIDs)
}
}
// flush tag value ids by one container
if err := m.forwardFlusher.FlushForwardIndex(tagValueIDs); err != nil {
return err
}
}
// flush all series ids under this tag key
return m.forwardFlusher.CommitTagKey(seriesIDs)
}