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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-547) New resource localization is tried even when Localized Resource is in DOWNLOADING state
Date Mon, 15 Apr 2013 18:52:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13632021#comment-13632021
] 

Hadoop QA commented on YARN-547:
--------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12578760/yarn-547-20130415.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-YARN-Build/739//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/739//console

This message is automatically generated.
                
> New resource localization is tried even when Localized Resource is in DOWNLOADING state
> ---------------------------------------------------------------------------------------
>
>                 Key: YARN-547
>                 URL: https://issues.apache.org/jira/browse/YARN-547
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Omkar Vinit Joshi
>            Assignee: Omkar Vinit Joshi
>         Attachments: yarn-547-20130411.1.patch, yarn-547-20130411.patch, yarn-547-20130412.patch,
yarn-547-20130415.patch
>
>
> At present when multiple containers try to request a localized resource 
> 1) If the resource is not present then first it is created and Resource Localization
starts ( LocalizedResource is in DOWNLOADING state)
> 2) Now if in this state multiple ResourceRequestEvents come in then ResourceLocalizationEvents
are fired for all of them.
> Most of the times it is not resulting into a duplicate resource download but there is
a race condition present there. 
> Location : ResourceLocalizationService.addResource .. addition of the request into "attempts"
in case of an event already exists.
> The root cause for this is the presence of FetchResourceTransition on receiving ResourceRequestEvent
in DOWNLOADING state.

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