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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14954) MetricsSystemImpl#init should increment refCount when already initialized
Date Wed, 18 Oct 2017 21:05:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16210036#comment-16210036
] 

Hadoop QA commented on HADOOP-14954:
------------------------------------

(!) A patch to the testing environment has been detected. 
Re-executing against the patched versions to perform further tests. 
The console is at https://builds.apache.org/job/PreCommit-HADOOP-Build/13549/console in case
of problems.


> MetricsSystemImpl#init should increment refCount when already initialized
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-14954
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14954
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 2.7.0
>            Reporter: John Zhuge
>            Priority: Minor
>         Attachments: HADOOP-14954.001.patch, HADOOP-14954.002.patch, HADOOP-14954.002a.patch
>
>
> {{++refCount}} here in {{init}} should be symmetric to {{--refCount}} in {{shutdown}}.
> {code:java}
>   public synchronized MetricsSystem init(String prefix) {
>     if (monitoring && !DefaultMetricsSystem.inMiniClusterMode()) {
>       LOG.warn(this.prefix +" metrics system already initialized!");
>       return this;
>     }
>     this.prefix = checkNotNull(prefix, "prefix");
>     ++refCount;
> {code}
> Move {{++refCount}}  to the beginning of this method.



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