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https://issues.apache.org/jira/browse/HADOOP-15327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17356433#comment-17356433
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Wei-Chiu Chuang commented on HADOOP-15327:
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Thanks for reporting the issue... I usually skip shading (-DskipShade) to build
during development so didn't notice it. We probably need to update our shading
rule to exclude netty (shading and relocating netty is a delicate art)
In addition to MR unit tests, if you can stand up a cluster, run the MR
shuffler with the netty leak detection option (java
-Dio.netty.leakDetection.level=advanced) enabled, we'll have more confidence in
it. https://github.com/apache/hadoop/pull/2832#issuecomment-818602960
> Upgrade MR ShuffleHandler to use Netty4
> ---------------------------------------
>
> Key: HADOOP-15327
> URL: https://issues.apache.org/jira/browse/HADOOP-15327
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Xiaoyu Yao
> Assignee: Szilard Nemeth
> Priority: Major
>
> This way, we can remove the dependencies on the netty3 (jboss.netty)
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