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Posted to issues@beam.apache.org by "Robert Bradshaw (Jira)" <ji...@apache.org> on 2022/05/12 17:21:00 UTC

[jira] [Created] (BEAM-14464) Optimize precombining table.

Robert Bradshaw created BEAM-14464:
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             Summary: Optimize precombining table.
                 Key: BEAM-14464
                 URL: https://issues.apache.org/jira/browse/BEAM-14464
             Project: Beam
          Issue Type: Bug
          Components: sdk-java-core
            Reporter: Robert Bradshaw


The current code constructs, hashes, and compares full WindowedValues for the grouping key, which ends up dominating the time spent in the combining table when using trivial combiners (like Sum.integers()). We only need compare the (structural value of the) key and windows, and can emit the windows in the global case.



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