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https://issues.apache.org/jira/browse/HBASE-16635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15502380#comment-15502380
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Duo Zhang commented on HBASE-16635:
-----------------------------------

{quote}
so you mean all the ByteBuf in the queue has to removed in the disconnect and 
not this particular wrapped byteBuf?
{quote}

Two things

1. The ByteBuf created by calling queue.remove should be release manually in 
the method as we do not pass it to the subsequent handlers.
2. When channel disconnect, there maybe some ByteBufs left in the queue, so we 
need to release them all by calling queue.releaseAndFailAll.

Thanks.

> RpcClient under heavy load leaks some netty bytebuf
> ---------------------------------------------------
>
>                 Key: HBASE-16635
>                 URL: https://issues.apache.org/jira/browse/HBASE-16635
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16635.patch
>
>
> Yet to analyse the actual root cause. 
> But the case is that when we run a PE tool with 50 threads under heavy load 
> when the writes are clogged I think we have some netty Bytebuf leak. Not sure 
> if it is a serious issue but we get this log
> {code}
> 2016-09-14 19:37:09,767 ERROR [Default-IPC-NioEventLoopGroup-1-16] 
> util.ResourceLeakDetector: LEAK: ByteBuf.release() was not called before it's 
> garbage-collected. Enable advanced leak reporting to find out where the leak 
> occurred. To enable advanced leak reporting, specify the JVM option 
> '-Dio.netty.leakDetection.level=advanced' or call 
> ResourceLeakDetector.setLevel() See 
> http://netty.io/wiki/reference-counted-objects.html for more information.
> {code}
> So reading the given link it is because of some ByteBuf that was not released 
> properly by the client and hence it gets GCed automatically. Netty provides 
> tips and tricks to find the root cause. Will get back here.



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