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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2914) Potential race condition in ClientSCMMetrics#getInstance()
Date Wed, 03 Dec 2014 23:41:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-2914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14233679#comment-14233679
] 

Sangjin Lee commented on YARN-2914:
-----------------------------------

Just to clarify, 

{code}
private static final ClientSCMMetrics instance = create();
{code}

> Potential race condition in ClientSCMMetrics#getInstance()
> ----------------------------------------------------------
>
>                 Key: YARN-2914
>                 URL: https://issues.apache.org/jira/browse/YARN-2914
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Ted Yu
>            Assignee: Varun Saxena
>            Priority: Minor
>             Fix For: 2.7.0
>
>         Attachments: YARN-2914.patch
>
>
> {code}
>   public static ClientSCMMetrics getInstance() {
>     ClientSCMMetrics topMetrics = Singleton.INSTANCE.impl;
>     if (topMetrics == null) {
>       throw new IllegalStateException(
> {code}
> getInstance() doesn't hold lock on Singleton.this
> This may result in IllegalStateException being thrown prematurely.



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