Robert Burke created BEAM-4468:
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Summary: Tune in memory pre-combine caching for Lifted Combines.
Key: BEAM-4468
URL: https://issues.apache.org/jira/browse/BEAM-4468
Project: Beam
Issue Type: Improvement
Components: sdk-go
Reporter: Robert Burke
Assignee: Henning Rohde
Requires [BEAM-4276|https://issues.apache.org/jira/browse/BEAM-4276] to be
completed first.
Additional performance tweaks to the in memory per-key accumulator cache during
the pre-combine phase of a lifted combine.
This can include any of
* capping the number of key-accumulator in the cache, and draining them
eagerly after x elements seen, or evicting keys by some heuristic after the
cache has seen X distinct keys.
* providing a counter on cache size (key/element counts) exposable through the
metrics interface or another runner standard counter, to permit observing the
cache's status, especially if it could grow without bound within a bundle.
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