[jira] [Commented] (HBASE-16635) RpcClient under heavy load leaks some netty bytebuf

["stack (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-16635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16427244#comment-16427244 ] 

stack commented on HBASE-16635:
-------------------------------

FYI: Got pushed w/ wrong JIRA ID

commit c5b8aababe18f65f5db979128a62d8a0686b9dc5
Author: Ramkrishna <ra...@intel.com>
Date:   Mon Sep 19 16:12:15 2016 +0530

    HBASE-16335 RpcClient under heavy load leaks some netty bytebuf (Ram)

> 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, HBASE-16635_1.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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