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836f1db04c
WIP: This needs more tests. It now gets a from and through value, which it may opportunistically use to optimize the retrieval. With possible future range indices, this could be used in a very efficient way. This change merely applies some easy checks, which should nevertheless solve the use case of heavy rule evaluations on servers with a lot of series churn. Idea is the following: - Only archive series that are at least as old as the headChunkTimeout (which was already extremely unlikely to happen). - Then maintain a high watermark for the last archival, i.e. no archived series has a sample more recent than that watermark. - Any query that doesn't reach to a time before that watermark doesn't have to touch the archive index at all. (A production server at Soundcloud with the aforementioned series churn and heavy rule evaluations spends 50% of its CPU time in archive index lookups. Since rule evaluations usually only touch very recent values, most of those lookup should disappear with this change.) - Federation with a very broad label matcher will profit from this, too. As a byproduct, the un-needed MetricForFingerprint method was removed from the Storage interface. |
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| .. | ||
| codable | ||
| fixtures/b0 | ||
| index | ||
| storagetool | ||
| chunk.go | ||
| crashrecovery.go | ||
| delta.go | ||
| delta_helpers.go | ||
| doubledelta.go | ||
| heads.go | ||
| instrumentation.go | ||
| interface.go | ||
| locker.go | ||
| locker_test.go | ||
| mapper.go | ||
| mapper_test.go | ||
| persistence.go | ||
| persistence_test.go | ||
| preload.go | ||
| series.go | ||
| storage.go | ||
| storage_test.go | ||
| test_helpers.go | ||