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https://issues.apache.org/jira/browse/FLINK-18695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17184054#comment-17184054
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Yun Gao commented on FLINK-18695:
---------------------------------
Hi [~chesnay] I did set the number of heap arenas the same value as the direct
heap arenas, and the total is computed by summing the direct and heap ones.
For the PERFER_DIRECT flag I'm thinking that it might be related since
[SSLHandler#allocate()|https://github.com/netty/netty/blob/8c5b72aaf02e7f349a9972dd9179b449b5a6067b/handler/src/main/java/io/netty/handler/ssl/SslHandler.java#L2190]
uses _alloc.buffer()_ instead of _alloc.heapBuffer()_ when
_engineType.wantsDirectBuffer = false,_ so PERFER_DIRECT would decide the true
type of buffers.
> 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
> Assignee: Yun Gao
> 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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