[
https://issues.apache.org/jira/browse/HADOOP-3135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Subramaniam Krishnan updated HADOOP-3135:
-----------------------------------------
Status: Patch Available (was: Open)
The patch has the below mentioned changes:
1) Added 'getSystemDir()' in JobSubmissionProtocol that would return the
jobtracker system dir. Job Client will use this dir for uploading all the files
on submission and JobInProgress will use it for retrieval
2) Replaced InterTrackerProtocol.getFileSystemName with
InterTrackerProtocol.getSystemDir & updated TaskTracker to use this to get the
FileSystem handle
3) Added 'getDefaultMaps()' & 'getDefaultReduces' to JobClient that will return
the default number of Maps and Reduces respectively.
Also added a TestCase - TestJobSysDirWithDFS that checks if a Job will run
successfully in spite of different system dir config between Job Client & Job
Tracker.
> 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: Alejandro Abdelnur
> Priority: Blocker
> Fix For: 0.17.0
>
> Attachments: patch-3135.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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
