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https://issues.apache.org/jira/browse/FLINK-18695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17167088#comment-17167088
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Chesnay Schepler commented on FLINK-18695:
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Allowing netty to use heap buffers is quite easy (just remove the overridden
methods in or {{NettyBufferPool}}, but what other changes would be required?
Would we also have to increase the number of heap arenas (from 0)?
How difficult is it adjust the memory model to account for this?
> Allow NettyBufferPool to allocate heap buffers
> ----------------------------------------------
>
> Key: FLINK-18695
> URL: https://issues.apache.org/jira/browse/FLINK-18695
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Network
> Reporter: Chesnay Schepler
> Priority: Major
> Fix For: 1.12.0
>
>
> in 4.1.43 netty made a change to their SslHandler to always use heap buffers
> for JDK SSLEngine implementations, to avoid an additional memory copy.
> However, our {{NettyBufferPool}} forbids heap buffer allocations.
> We will either have to allow heap buffer allocations, or create a custom
> SslHandler implementation that does not use heap buffers (although this seems
> ill-adviced?).
> /cc [~sewen] [~uce] [~NicoK] [~zjwang] [~pnowojski]
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