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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2701) Potential race condition in startLocalizer when using LinuxContainerExecutor
Date Tue, 21 Oct 2014 15:12:37 GMT

    [ https://issues.apache.org/jira/browse/YARN-2701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14178494#comment-14178494
] 

Hudson commented on YARN-2701:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1933 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1933/])
YARN-2701. Potential race condition in startLocalizer when using LinuxContainerExecutor. Contributed
by Xuan Gong (jianhe: rev 2839365f230165222f63129979ea82ada79ec56e)
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LinuxContainerExecutor.java
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.c
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/TestLinuxContainerExecutor.java
* hadoop-yarn-project/CHANGES.txt
Missing file for YARN-2701 (jianhe: rev 4fa1fb3193bf39fcb1bd7f8f8391a78f69c3c302)
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/MockContainerLocalizer.java


> 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
>
>
> 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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