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Posted to commits@beam.apache.org by "Robert Bradshaw (JIRA)" <ji...@apache.org> on 2018/04/07 00:28:00 UTC

[jira] [Created] (BEAM-4030) Add CombineFn.compact, similar to Java

Robert Bradshaw created BEAM-4030:
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             Summary: Add CombineFn.compact, similar to Java
                 Key: BEAM-4030
                 URL: https://issues.apache.org/jira/browse/BEAM-4030
             Project: Beam
          Issue Type: Bug
          Components: sdk-py-core
            Reporter: Robert Bradshaw
            Assignee: Ahmet Altay


Some CombineFns buffer elements in their add_inputs because a combining operation cost can be effectively amortized across many elements. However, this introduces the extra (possibly higher) cost of potentially serializing more expensive buffers through shuffle. We should add a CombineFn.compact(self, accumulator) method (defaulting to the identity) similar to what the Java SDK provides which is called when flushing an element from the PGBKCV table. 



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