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https://issues.apache.org/jira/browse/FLINK-3340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15144753#comment-15144753
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ASF GitHub Bot commented on FLINK-3340:
---------------------------------------
Github user greghogan commented on the pull request:
https://github.com/apache/flink/pull/1626#issuecomment-183389185
`MergeIterator.next(reuse)` should allow object swapping. The source code
documentation should be improved to make this clearer, but this contract is
necessary to minimize the copying of objects
> Fix object juggling in drivers
> ------------------------------
>
> Key: FLINK-3340
> URL: https://issues.apache.org/jira/browse/FLINK-3340
> Project: Flink
> Issue Type: Bug
> Components: Distributed Runtime
> Affects Versions: 1.0.0
> Reporter: Greg Hogan
> Assignee: Greg Hogan
> Priority: Critical
>
> {{ReduceDriver}}, {{ReduceCombineDriver}}, and {{ChainedAllReduceDriver}} are
> not properly tracking objects for reuse.
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