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https://issues.apache.org/jira/browse/FLINK-7316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16119981#comment-16119981
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Nico Kruber commented on FLINK-7316:
------------------------------------

After changing to off-heap network buffers, we are hit by FLINK-7400 and thus 
failing yarn cluster environments.

> always use off-heap network buffers
> -----------------------------------
>
>                 Key: FLINK-7316
>                 URL: https://issues.apache.org/jira/browse/FLINK-7316
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Core, Network
>    Affects Versions: 1.4.0
>            Reporter: Nico Kruber
>            Assignee: Nico Kruber
>
> In order to send flink buffers through netty into the network, we need to 
> make the buffers use off-heap memory. Otherwise, there will be a hidden copy 
> happening in the NIO stack.



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