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https://issues.apache.org/jira/browse/FLINK-12135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16813065#comment-16813065
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BoWang commented on FLINK-12135:
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Due to the high cost of splitting, in the first step we only merge partitions,
i.e., only decrease parallelism
> Decrease parallelism of tasks with too small input data size
> ------------------------------------------------------------
>
> Key: FLINK-12135
> URL: https://issues.apache.org/jira/browse/FLINK-12135
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Coordination
> Reporter: BoWang
> Assignee: BoWang
> Priority: Major
>
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