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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2701) Potential race condition in startLocalizer when using LinuxContainerExecutor
Date Fri, 31 Oct 2014 19:40:36 GMT

    [ https://issues.apache.org/jira/browse/YARN-2701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14192327#comment-14192327
] 

Hadoop QA commented on YARN-2701:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12677055/YARN-2701.addendum.4.patch
  against trunk revision f1a149e.

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

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

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

    {color:green}+1 javadoc{color}.  There were no new javadoc 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
2.0.3) 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/5664//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/5664//console

This message is automatically generated.

> Potential race condition in startLocalizer when using LinuxContainerExecutor  
> ------------------------------------------------------------------------------
>
>                 Key: YARN-2701
>                 URL: https://issues.apache.org/jira/browse/YARN-2701
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>            Priority: Blocker
>             Fix For: 2.6.0
>
>         Attachments: YARN-2701.1.patch, YARN-2701.2.patch, YARN-2701.3.patch, YARN-2701.4.patch,
YARN-2701.5.patch, YARN-2701.6.patch, YARN-2701.addendum.1.patch, YARN-2701.addendum.2.patch,
YARN-2701.addendum.3.patch, YARN-2701.addendum.4.patch
>
>
> When using LinuxContainerExecutor do startLocalizer, we are using native code container-executor.c.

> {code}
>      if (stat(npath, &sb) != 0) {
>        if (mkdir(npath, perm) != 0) {
> {code}
> We are using check and create method to create the appDir under /usercache. But if there
are two containers trying to do this at the same time, race condition may happen.



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