[PERF] TSDB: Optimize inverse matching (#14144) #756
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aknuds1
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Simple follow-up to #13620. Modify `tsdb.PostingsForMatchers` to use the optimized tsdb.IndexReader.PostingsForLabelMatching method also for inverse matching. Introduce method `PostingsForAllLabelValues`, to avoid changing the existing method. The performance is much improved for a subset of the cases; there are up to ~60% CPU gains and ~12.5% reduction in memory usage. Remove `TestReader_InversePostingsForMatcherHonorsContextCancel` since `inversePostingsForMatcher` only passes `ctx` to `IndexReader` implementations now. Signed-off-by: Arve Knudsen <[email protected]>
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Cherry-pick prometheus/prometheus#14144, a querying performance improvement (see upstream PR for benchmark stats).