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https://issues.apache.org/jira/browse/FLINK-2655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabian Hueske closed FLINK-2655.
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Resolution: Fixed
Fix Version/s: 0.10
Fixed with a75dd6270fd47720ae1c2ce9464ff6b8f7b43d39
> Minimize intermediate merging of spilled buffers
> ------------------------------------------------
>
> Key: FLINK-2655
> URL: https://issues.apache.org/jira/browse/FLINK-2655
> Project: Flink
> Issue Type: Improvement
> Components: Distributed Runtime
> Affects Versions: master
> Reporter: Greg Hogan
> Fix For: 0.10
>
>
> If the number of spilled buffers exceeds taskmanager.runtime.max-fan then the
> number of files must reduced with an intermediate merge by reading, merging,
> and spilling into a single, larger file.
> The current implementation performs an intermediate merge on all files. An
> optimal implementation minimizes the amount of merged data by performing
> partial merges first.
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