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Allow aggs to disable offloading sequential collection #98276
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javanna
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javanna:enhancement/aggs_offload_sequential
Aug 8, 2023
Merged
Allow aggs to disable offloading sequential collection #98276
javanna
merged 6 commits into
elastic:main
from
javanna:enhancement/aggs_offload_sequential
Aug 8, 2023
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In elastic#98204 we are introducing unconditional offloading of collection to a separate thread pool, even for requests of phases that don't enable search concurrency. It turns out that some aggs don't support offloading their collection to a separate thread, as their postCollect method is executed on the search thread which trips a lucene assertion around reusing data structures pulled from the search worker thread. With this commit we allow aggs to specify when they don't support offloading their sequential collection. Such aggs are a subset of the ones that already declare that they don't support concurrency entirely. Relates to elastic#96023
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martijnvg
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This looks good for now to me in order to progress #98204.
But I do think that we should look into executing postCollection on the search worker thread rather sooner than later.
test/framework/src/main/java/org/elasticsearch/search/aggregations/BaseAggregationTestCase.java
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Labels
:Analytics/Aggregations
Aggregations
>refactoring
:Search/Search
Search-related issues that do not fall into other categories
Team:Analytics
Meta label for analytical engine team (ESQL/Aggs/Geo)
Team:Search
Meta label for search team
v8.10.0
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In #98204 we are introducing unconditional offloading of collection to a separate thread pool, even for requests of phases that don't enable search concurrency. It turns out that some aggs don't support offloading their collection to a separate thread, as their postCollect method is executed on the search thread which trips a lucene assertion around reusing data structures pulled from the search worker thread.
With this commit we allow aggs to specify when they don't support offloading their sequential collection. Such aggs are a subset of the ones that already declare that they don't support concurrency entirely.
Relates to #96023