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https://issues.apache.org/jira/browse/BEAM-4030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Bradshaw resolved BEAM-4030.
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Resolution: Fixed
Fix Version/s: 2.11.0
> 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: Robert Bradshaw
> Priority: Major
> Fix For: 2.11.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> 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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