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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13159) Fix potential NPE in Metrics2 source for DecayRpcScheduler
Date Tue, 17 May 2016 21:20:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15287589#comment-15287589

Arpit Agarwal commented on HADOOP-13159:

+1 for the v02 patch. Actually you are avoiding 19 invocations of topNCallers.size() with
the update.

> Fix potential NPE in Metrics2 source for DecayRpcScheduler
> ----------------------------------------------------------
>                 Key: HADOOP-13159
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13159
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 2.8.0
>            Reporter: Xiaoyu Yao
>            Assignee: Xiaoyu Yao
>         Attachments: HADOOP-13159.00.patch, HADOOP-13159.01.patch, HADOOP-13159.02.patch
> HADOOP-12985 introduced a few metrics2 counters for DecayRpcScheduler. The counters should
be initialized before the updater thread is created/executed. Otherwise, this is a chance
of NPE  if the updater thread get executed before the counters are fully initialized. I will
post a patch for it shortly. 

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