15 Commits (04b370da00d7a9e34afa4d8931753b3b1849843d)

Author	SHA1	Message	Date
Björn Rabenstein	dccfb9db4e	histogram: Remove code replication via generics (#11361) ... * histogram: Simplify iterators We don't really need currLower and currUpper and can calculate it when needed (as already done for the floatBucketIterator). The calculation is cheap, while keeping those extra variables around costs RAM (potentially a lot with many iterators). * histogram: Convert Bucket/FloatBucket to one generic type * histogram: Move some bucket iterator code into generic base iterator * histogram: Remove cumulative iterator for FloatHistogram We added it in the past for completeness (Histogram has one), but it has never been used. Plus, even the cumulative iterator for Histogram is only there for test reasons. We can always add it back, and then maybe even using generics. Signed-off-by: beorn7 <beorn@grafana.com>	2 years ago
beorn7	a7c519930e	histograms: Add Compact method to the normal integer Histogram ... And use the new method to call to compact Histograms during parsing. This happens for both `Histogram` and `FloatHistogram`. In this way, if targets decide to optimize the exposition size by merging spans with empty buckets in between, we still get a normalized results. It will also normalize away any valid but weird representations like empty spans, spans with offset zero, and empty buckets at the start or end of a span. The implementation seemed easy at first as it just turns the `compactBuckets` helper into a generic function (which now got its own file). However, the integer Histograms have delta buckets instead of absolute buckets, which had to be treated specially in the generic `compactBuckets` function. To make sure it works, I have added plenty of explicit tests for `Histogram` in addition to the `FloatHistogram` tests. I have also updated the doc comment for the `Compact` method. Based on the insights now expressed in the doc comment, compacting with a maxEmptyBuckets > 0 is rarely useful. Therefore, this commit also sets the value to 0 in the two cases we were using 3 so far. We might still want to reconsider, so I don't want to remove the maxEmptyBuckets parameter right now. Signed-off-by: beorn7 <beorn@grafana.com>	2 years ago
beorn7	2d233cf95e	Histogram: Fix allFloatBucketIterator ... If the zero threshold overlaps with the highest negative bucket and/or the lowest positive bucket, its upper or lower boundary, respectively, has to be adjusted. In valid histograms, only ever the highest negative bucket and/or the lowest positive bucket may overlap with the zero bucket. This is assumed in this code to simplify the checks. Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago
beorn7	56db51c826	Histgram: Fix Compact for spans of only empty buckets ... Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago
beorn7	15583af9bb	Histogram: Fix crash when compacting only empty buckets ... Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago
beorn7	9fbcf14e5c	histogram: Handle changes of the ZeroThreshold and the Schema ... Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago
Björn Rabenstein	ec80745884	Merge pull request #10075 from prometheus/beorn7/histogram ... model: Implement FloatHistogram.Compact	3 years ago
beorn7	3b4d6c3fdb	model: Implement FloatHistogram.Compact ... Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago
beorn7	e7592fe353	sparsehistogram: Address two TODOs ... Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago
beorn7	27f865ec49	histograms: avoid initialization tracking in reverseFloatBucketIterator ... Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago
beorn7	a6acdfe346	histograms: Doc comment and naming improvements ... Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago
Ganesh Vernekar	4a43349aca	`histogram_quantile` for sparse histograms (#9935) ... * MergeFloatBucketIterator for []FloatBucketIterator Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com> * histogram_quantile for histograms Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com> * Fix histogram_quantile Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com> * Unit test and enhancements Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com> * Iterators to iterate buckets in reverse and all buckets together including zero bucket Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com> * Consider all buckets for histogram_quantile and fix the implementation Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com> * Remove unneeded code Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com> * Fix lint Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>	3 years ago
Björn Rabenstein	0e1b9dd308	Promql: Initial rate implementation for sparse histograms (#9926) ... Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago
Björn Rabenstein	7e42acd3b1	tsdb: Rework iterators (#9877) ... - Pick At... method via return value of Next/Seek. - Do not clobber returned buckets. - Add partial FloatHistogram suppert. Note that the promql package is now _only_ dealing with FloatHistograms, following the idea that PromQL only knows float values. As a byproduct, I have removed the histogramSeries metric. In my understanding, series can have both float and histogram samples, so that metric doesn't make sense anymore. As another byproduct, I have converged the sampleBuf and the histogramSampleBuf in memSeries into one. The sample type stored in the sampleBuf has been extended to also contain histograms even before this commit. Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago
beorn7	6a820a646c	histogram: Add FloatHistogram ... Including a few adjustments for normal Histogram, too, e.g. use pointer receiver to avoid the large copy on method calls. Signed-off-by: beorn7 <beorn@grafana.com>	3 years ago