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https://issues.apache.org/jira/browse/FLINK-10339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16623153#comment-16623153
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zhijiang commented on FLINK-10339:
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Hey [~NicoK] [~pnowojski], do you think we should make {{SpillReadBufferPool}}
use direct memory as current {{NetworkBufferPool}} or are there any concerns to
change this?
> SpillReadBufferPool cannot use off-heap memory
> ----------------------------------------------
>
> Key: FLINK-10339
> URL: https://issues.apache.org/jira/browse/FLINK-10339
> Project: Flink
> Issue Type: Improvement
> Components: Network
> Affects Versions: 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.6.0, 1.7.0
> Reporter: zhijiang
> Assignee: zhijiang
> Priority: Minor
>
> Currently, the {{NetworkBufferPool}} always uses off-heap memory to reduce
> memory copy from flink {{Buffer}} to netty internal {{ByteBuf}} during
> transporting on sender side.
>
> But for {{SpillReadBufferPool}} in {{SpilledSubpartitionView}}, it still uses
> heap memory for caching. We can make it as off-heap by default similar with
> {{NetworkBufferPool}} or decide the type by the current parameter
> {{taskmanager.memory.off-heap.}}
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