feat(core): OTel Exponential Histograms #1879
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vishramachandran
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sandeep6189 and
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memory/src/main/scala/filodb.memory/format/vectors/Histogram.scala
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memory/src/main/scala/filodb.memory/format/vectors/Histogram.scala
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memory/src/main/scala/filodb.memory/format/vectors/Histogram.scala
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memory/src/main/scala/filodb.memory/format/vectors/Histogram.scala
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memory/src/main/scala/filodb.memory/format/vectors/HistogramVector.scala
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memory/src/main/scala/filodb.memory/format/vectors/HistogramVector.scala
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sandeep6189
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Nov 13, 2024
| val b = it.next() | ||
| val zeroBucket = (b == 0) | ||
| val bucketUpper = bucketTop(b) | ||
| val bucketLower = if (b == 0) 0.0 else bucketTop(b - 1) |
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nitpick - if (zeroBucket) 0.0 else bucketTop(b - 1)
same for prevBucketVal
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I'll fix in my next PR :)
| @@ -160,6 +262,9 @@ final case class LongHistogram(buckets: HistogramBuckets, values: Array[Long]) e | |||
| s"Expected: ${buckets}, Found: ${other.buckets}" | |||
| ) | |||
| } | |||
| // TODO if otel histogram, the need to add values in a different way | |||
| // see if we can refactor since MutableHistogram also has this logic | |||
| assert(other.buckets == buckets) | |||
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nitpick: wondering if this check is redundant, since the previous if check does the same thing ?
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ah yes - this is from a merge conflict that I needed to resolve. I'll remove in my next PR
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Pull Request checklist
Open Telemetry Exponential Histograms Part 1 includes:
rate,sumandhistogram_quantilefunctions testedhistogram_fractionBenchmarks show that increasing the number of buckets does not significantly impact performance. Increasing buckets by 700% (8x) reduced throughput by just 11.6% (0.116x).
Coming in later PRs
ratecalculation with counter correction for cumulative exponential histograms