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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2925) [HOD] Create mapred system directory using a naming convention that will avoid clashes in multi-user shared cluster scenario.
Date Wed, 05 Mar 2008 17:25:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575428#action_12575428

Hadoop QA commented on HADOOP-2925:

-1 overall.  Here are the results of testing the latest attachment 
against trunk revision 619744.

    @author +1.  The patch does not contain any @author tags.

    tests included -1.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    javadoc +1.  The javadoc tool did not generate any warning messages.

    javac +1.  The applied patch does not generate any new javac compiler warnings.

    release audit +1.  The applied patch does not generate any new release audit warnings.

    findbugs +1.  The patch does not introduce any new Findbugs warnings.

    core tests +1.  The patch passed core unit tests.

    contrib tests +1.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1895/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1895/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1895/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1895/console

This message is automatically generated.

> [HOD] Create mapred system directory using a naming convention that will avoid clashes
in multi-user shared cluster scenario.
> -----------------------------------------------------------------------------------------------------------------------------
>                 Key: HADOOP-2925
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2925
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/hod
>    Affects Versions: 0.16.0
>            Reporter: Hemanth Yamijala
>            Assignee: Hemanth Yamijala
>             Fix For: 0.16.1
>         Attachments: 2925.1.patch, 2925.2.patch, 2925.patch
> Currently, HOD generates the name of the mapredsystem directory using the name /mapredsystem/hostname-of-jobtracker.
> In HADOOP-2899, we ran into a scenario where this naming convention could lead to problems
in case dfs permissions are enabled. While the bug should ideally be addressed in Hadoop M/R,
it will be better that HOD does not generate names that can potentially clash across runs.
One way to solve the problem is to do what HOD already does for local log and temp directories
- name it using username.torque-job-id, which is going to be pretty unique mostly.

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