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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3135) if the 'mapred.system.dir' in the client jobconf is different from the JobTracker's value job submission fails
Date Sun, 20 Apr 2008 14:34:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590768#action_12590768

Hadoop QA commented on HADOOP-3135:

+1 overall.  Here are the results of testing the latest attachment 
against trunk revision 645773.

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

    tests included +1.  The patch appears to include 6 new or modified tests.

    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/2280/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2280/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2280/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2280/console

This message is automatically generated.

> if the 'mapred.system.dir' in the client jobconf is different from the JobTracker's value
job submission fails
> --------------------------------------------------------------------------------------------------------------
>                 Key: HADOOP-3135
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3135
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.16.1
>         Environment: all
>            Reporter: Alejandro Abdelnur
>            Assignee: Subramaniam Krishnan
>            Priority: Critical
>             Fix For: 0.18.0
>         Attachments: patch-3135-v3.txt, patch-3135-v4.txt, patch-3135-v5.txt, patch-3135-v6.txt,
patch-3135-v6_2.txt, patch-3135-v6_3.txt
> Until Hadoop 0.13 or so, at submission time the full path of the job.xml and all supporting
files in DFS was given by the client to the jobtracker.
> Since 0.15 onwards (we did not test 0.14) the jobclient is obtaining the job ID from
the jobtracker and creating the directory for all the supporting files using the a system-dir
computed from the local jobconf.
> Line 696-7 in the JobClient:
>     String jobId = jobSubmitClient.getNewJobId();
>     Path submitJobDir = new Path(job.getSystemDir(), jobId);
> This makes submissions to fail when the value of the 'mapred.system.dir' on the client
is different from the one in the JobTracker.
> A simple way o fixing this would be to introduce a new method in the JobSubmissionProtocol
'getSystemDir()' that would return the jobtracker system dir and use that dir for uploading
all the files on submission.
> ----
> For the future: A more comprehensive way of this doing would to obtain a base jobConf
from the jobtracker, carrying final information for each element and the construct the job.xml
on the client using the final semantics. And, in this case the 'mapred.system.dir' property
should be set as final in the jobtracker. As there may be some configuration properties that
are sensitive and for security reasons should not be exposed to the clients a new flag 'private'
could be introduced and only properties that don't have the 'private' flag would be send over
from the jobtracker to the jobclient for job.xml resolution.

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