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https://issues.apache.org/jira/browse/FLINK-4113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15351395#comment-15351395
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ASF GitHub Bot commented on FLINK-4113:
---------------------------------------
Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/2156
@tillrohrmann just added a test for `ChainedAllReduceDriver`. I didn't see
a way to build a lightweight test for chained drivers as we do with the
unchained drivers.
> Always copy first value in ChainedAllReduceDriver
> -------------------------------------------------
>
> Key: FLINK-4113
> URL: https://issues.apache.org/jira/browse/FLINK-4113
> Project: Flink
> Issue Type: Bug
> Components: Local Runtime
> Affects Versions: 1.1.0, 1.0.4
> Reporter: Greg Hogan
> Assignee: Greg Hogan
> Priority: Critical
> Fix For: 1.1.0, 1.0.4
>
>
> {{ChainedAllReduceDriver.collect}} must copy the first record even when
> object reuse is enabled or {{base}} may later point to the same object as
> {{record}}.
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