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https://issues.apache.org/jira/browse/BEAM-4030?focusedWorklogId=181296&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-181296
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ASF GitHub Bot logged work on BEAM-4030:
----------------------------------------
Author: ASF GitHub Bot
Created on: 04/Jan/19 20:44
Start Date: 04/Jan/19 20:44
Worklog Time Spent: 10m
Work Description: aaltay commented on pull request #7405: [BEAM-4030] Add
compact attribute to combiners
URL: https://github.com/apache/beam/pull/7405
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Issue Time Tracking
-------------------
Worklog Id: (was: 181296)
Time Spent: 50m (was: 40m)
> 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
> Priority: Major
> Time Spent: 50m
> 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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