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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