fec882a457
Historically only two things happened in the final reduction: empty buckets were filled, and pipeline aggs were reduced (since it was the final reduction, this was safe). Usage of the final reduction is growing however. Auto-date-histo might need to perform many reductions on final-reduce to merge down buckets, CCS may need to side-step the final reduction if sending to a different cluster, etc Having pipelines generate their output in the final reduce was convenient, but is becoming increasingly difficult to manage as the rest of the agg framework advances. This commit decouples pipeline aggs from the final reduction by introducing a new "top level" reduce, which should be called at the beginning of the reduce cycle (e.g. from the SearchPhaseController). This will only reduce pipeline aggs on the final reduce after the non-pipeline agg tree has been fully reduced. By separating pipeline reduction into their own set of methods, aggregations are free to use the final reduction for whatever purpose without worrying about generating pipeline results which are non-reducible |
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| dev-tools | ||
| docs | ||
| license-tools | ||
| plugin | ||
| qa | ||
| snapshot-tool | ||
| test | ||
| transport-client | ||
| NOTICE.txt | ||
| README.md | ||
| build.gradle | ||
README.md
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