Speedup DistinctValue collector and exit early for ingesters #4104
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electron0zero
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joe-elliott,
annanay25,
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kvrhdn,
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stoewer
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electron0zero
changed the title
joe-elliott
reviewed
Sep 20, 2024
electron0zero
commented
Sep 20, 2024
| d.values[v] = struct{}{} | ||
| d.currLen += valueLen | ||
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| return false | ||
| } | ||
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| // Values returns the final list of distinct values collected and sorted. | ||
| func (d *DistinctValue[T]) Values() []T { | ||
| ss := make([]T, 0, len(d.values)) |
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@joe-elliott I think we have the same subtle bug here as well, that we had in Diff.
we are checking the len of a member var without locking. I think we got lucky here because we usualy call Values after we are done collecting.
locking this as well.
joe-elliott
approved these changes
Sep 20, 2024
joe-elliott
approved these changes
Sep 20, 2024
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What this PR does:
now with early stop, we will bail out and return results instead of collecting the values after hitting the limit.
how fast? collector is 47% faster when used without any limits and 60% - 80% faster when used with limit and we hit the limits, and around 90-100% faster when we early stop when limit is hit
Benchmarks
main (no early stop) vs fast collector (with early stop)
main (with early stop) vs fast collector (with early stop)
main (no early stop) vs fast collector (no early stop)
main (with early stop) vs fast collector (no early stop)
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]