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https://issues.apache.org/jira/browse/BEAM-7574?focusedWorklogId=282318&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-282318
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ASF GitHub Bot logged work on BEAM-7574:
----------------------------------------
Author: ASF GitHub Bot
Created on: 24/Jul/19 22:10
Start Date: 24/Jul/19 22:10
Worklog Time Spent: 10m
Work Description: je-ik commented on issue #8946: [BEAM-7574] fix Combine
performance for SparkRunner
URL: https://github.com/apache/beam/pull/8946#issuecomment-514818460
Run Spark ValidatesRunner
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Issue Time Tracking
-------------------
Worklog Id: (was: 282318)
Time Spent: 4h 40m (was: 4.5h)
> Spark runner: Combine.perKey performance issues
> -----------------------------------------------
>
> Key: BEAM-7574
> URL: https://issues.apache.org/jira/browse/BEAM-7574
> Project: Beam
> Issue Type: Improvement
> Components: runner-spark
> Affects Versions: 2.13.0
> Reporter: Jan Lukavský
> Assignee: Jan Lukavský
> Priority: Major
> Time Spent: 4h 40m
> Remaining Estimate: 0h
>
> Combine.perKey on current implementation uses technique of creating an
> accumulator for each input key and then merge all these accumulators
> together. Optimize this by:
> * changing accumulator from Iterable to Map, and using addInput as much as
> possible
> * try to move the window explode to pre-shuffle (add window label to key for
> non-merging windows), measure the impact, and if the impact is substantial,
> implement that for at leasit window functions assigning to single (global)
> window or single window per element (tumbling windows)
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