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Reduce memory usage from ingester Push() errors #1922

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Merged
merged 3 commits into from
Dec 18, 2019

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bboreham
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Fixes #1301

There is quite a lot of refactoring here, pulling out various things into helper functions in a new file errors.go. Also I moved a couple of places that the discarded samples metric is incremented for consistency.

I'm not very clear why we need "httpgrpc" at all here, as Push() is only called over gRPC, but left that for another day.

Benchmark before:

BenchmarkIngesterPushErrors  10  154925847 ns/op  137223744 B/op  516830 allocs/op

after:

BenchmarkIngesterPushErrors  50  33549567 ns/op    4411341 B/op    64796 allocs/op

Signed-off-by: Bryan Boreham <bryan@weave.works>
Signed-off-by: Bryan Boreham <bryan@weave.works>
…tion

It's more efficient to defer constructing the httpgrpc error until the
end, because we only report the last error out of possibly hundreds.

Signed-off-by: Bryan Boreham <bryan@weave.works>
@bboreham bboreham force-pushed the smaller-ingester-push-errors branch from dd8f7c4 to d4cd56c Compare December 18, 2019 13:01
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LGTM!

@bboreham bboreham merged commit d57fe0f into master Dec 18, 2019
@bboreham bboreham deleted the smaller-ingester-push-errors branch December 18, 2019 17:42
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Ingestion latency spikes when discarding metrics due to limits
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