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Posted to issues@beam.apache.org by "Robert Bradshaw (JIRA)" <ji...@apache.org> on 2019/01/31 12:14:00 UTC

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

     [ https://issues.apache.org/jira/browse/BEAM-4030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Bradshaw resolved BEAM-4030.
-----------------------------------
       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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