Filter shards for sliced search at coordinator #16771
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Prior to this commit, a sliced search would fan out to every shard, then apply a MatchNoDocsQuery filter on shards that don't correspond to the current slice. This still creates a (useless) search context on each shard for every slice, though. For a long-running sliced scroll, this can quickly exhaust the number of available scroll contexts. This change avoids fanning out to all the shards by checking at the coordinator if a shard is matched by the current slice. This should reduce the number of open scroll contexts to max(numShards, numSlices) instead of numShards * numSlices. Signed-off-by: Michael Froh <[email protected]>
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❌ Gradle check result for 2d2fd05: FAILURE Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change? |
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Description
Prior to this commit, a sliced search would fan out to every shard, then apply a MatchNoDocsQuery filter on shards that don't correspond to the current slice. This still creates a (useless) search context on each shard for every slice, though. For a long-running sliced scroll, this can quickly exhaust the number of available scroll contexts.
This change avoids fanning out to all the shards by checking at the coordinator if a shard is matched by the current slice. This should reduce the number of open scroll contexts to max(numShards, numSlices) instead of numShards * numSlices.
Related Issues
Related to #16289
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