Only execute one final reduction in InternalAutoDateHistogram #45359
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Because auto-date-histo can perform multiple reductions while merging buckets, we need to ensure that the intermediate reductions are done with a `finalReduce` set to false to prevent Pipeline aggs from generating their output. Once all the buckets have been merged and the output is stable, a mostly-noop reduction can be performed which will allow pipelines to generate their output.
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Pinging @elastic/es-analytics-geo |
pcsanwald
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Aug 8, 2019
...n/java/org/elasticsearch/search/aggregations/bucket/histogram/InternalAutoDateHistogram.java
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@elasticmachine update branch |
polyfractal
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Aug 12, 2019
Because auto-date-histo can perform multiple reductions while merging buckets, we need to ensure that the intermediate reductions are done with a `finalReduce` set to false to prevent Pipeline aggs from generating their output. Once all the buckets have been merged and the output is stable, a mostly-noop reduction can be performed which will allow pipelines to generate their output.
This was referenced Aug 12, 2019
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I reverted this commit because Unsure of the cause, but it was starting to look like it's not just a test bug but an actual problem with the PR. Will revisit and open a new PR. |
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Because auto-date-histo can perform multiple reductions while merging buckets, we need to ensure that the intermediate reductions are done with a
finalReduceset to false to prevent Pipeline aggs from generating their output.This is done by creating a "fake" non-final reduce context for the intermediate merging. Once all the buckets have been merged and the output is stable, a mostly-noop final reduction can be performed which will allow pipelines to generate their output.
Closes #44914