mirror of https://github.com/prometheus/prometheus
95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
// Copyright 2024 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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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//go:build dedupelabels
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package tsdb
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import (
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"log/slog"
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"github.com/prometheus/prometheus/model/labels"
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)
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// Helper method to access labels under lock.
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func (s *memSeries) labels() labels.Labels {
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s.Lock()
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defer s.Unlock()
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return s.lset
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}
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// RebuildSymbolTable goes through all the series in h, build a SymbolTable with all names and values,
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// replace each series' Labels with one using that SymbolTable.
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func (h *Head) RebuildSymbolTable(logger *slog.Logger) *labels.SymbolTable {
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logger.Info("RebuildSymbolTable starting")
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st := labels.NewSymbolTable()
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builder := labels.NewScratchBuilderWithSymbolTable(st, 0)
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rebuildLabels := func(lbls labels.Labels) labels.Labels {
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builder.Reset()
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lbls.Range(func(l labels.Label) {
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builder.Add(l.Name, l.Value)
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})
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return builder.Labels()
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}
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for i := 0; i < h.series.size; i++ {
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h.series.locks[i].Lock()
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for _, s := range h.series.hashes[i].unique {
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s.Lock()
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s.lset = rebuildLabels(s.lset)
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s.Unlock()
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}
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for _, all := range h.series.hashes[i].conflicts {
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for _, s := range all {
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s.Lock()
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s.lset = rebuildLabels(s.lset)
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s.Unlock()
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}
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}
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h.series.locks[i].Unlock()
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}
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type withReset interface{ ResetSymbolTable(*labels.SymbolTable) }
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if e, ok := h.exemplars.(withReset); ok {
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e.ResetSymbolTable(st)
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}
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logger.Info("RebuildSymbolTable finished", "size", st.Len())
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return st
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}
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func (ce *CircularExemplarStorage) ResetSymbolTable(st *labels.SymbolTable) {
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builder := labels.NewScratchBuilderWithSymbolTable(st, 0)
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rebuildLabels := func(lbls labels.Labels) labels.Labels {
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builder.Reset()
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lbls.Range(func(l labels.Label) {
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builder.Add(l.Name, l.Value)
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})
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return builder.Labels()
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}
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ce.lock.RLock()
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defer ce.lock.RUnlock()
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for _, v := range ce.index {
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v.seriesLabels = rebuildLabels(v.seriesLabels)
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}
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for i := range ce.exemplars {
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if ce.exemplars[i].ref == nil {
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continue
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}
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ce.exemplars[i].exemplar.Labels = rebuildLabels(ce.exemplars[i].exemplar.Labels)
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}
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}
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