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Posted to commits@beam.apache.org by "Thomas Weise (JIRA)" <ji...@apache.org> on 2016/11/07 17:59:59 UTC

[jira] [Created] (BEAM-935) Pre-aggregation for group-by-key

Thomas Weise created BEAM-935:
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             Summary: Pre-aggregation for group-by-key
                 Key: BEAM-935
                 URL: https://issues.apache.org/jira/browse/BEAM-935
             Project: Beam
          Issue Type: Improvement
          Components: runner-apex
            Reporter: Thomas Weise


Apex runner currently does not perform pre-aggregation of results in GBK. Depending on the input data volume the result iterable for a given window can grow very large and lead to performance degradation and out of memory errors. This can be mitigated by applying the combine function during GBK.  



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