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Posted to mapreduce-issues@hadoop.apache.org by "Karthik Kambatla (JIRA)" <ji...@apache.org> on 2013/02/04 23:16:13 UTC
[jira] [Updated] (MAPREDUCE-4843) When using DefaultTaskController,
JobLocalizer not thread safe
[ https://issues.apache.org/jira/browse/MAPREDUCE-4843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Karthik Kambatla updated MAPREDUCE-4843:
----------------------------------------
Attachment: mr-4843.patch
Uploading the patch from MAPREDUCE-4964 as that solves this issue in a simpler/cleaner way. The discussion on that JIRA has all the details.
Applied the patch to latest branch-1 and it applies cleanly. Also, verified TestJobLocalizer passes.
> When using DefaultTaskController, JobLocalizer not thread safe
> --------------------------------------------------------------
>
> Key: MAPREDUCE-4843
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4843
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Affects Versions: 1.1.1
> Reporter: zhaoyunjiong
> Assignee: Karthik Kambatla
> Priority: Critical
> Attachments: MAPREDUCE-4843-branch-1.1.patch, mr-4843.patch
>
>
> In our cluster, some times job will failed due to below exception:
> 2012-12-03 23:11:54,811 WARN org.apache.hadoop.mapred.TaskTracker: Error initializing attempt_201212031626_1115_r_000023_0:
> org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find taskTracker/$username/jobcache/job_201212031626_1115/job.xml in any of the configured local directories
> at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathToRead(LocalDirAllocator.java:424)
> at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathToRead(LocalDirAllocator.java:160)
> at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1175)
> at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1058)
> at org.apache.hadoop.mapred.TaskTracker.startNewTask(TaskTracker.java:2213)
> The root cause is JobLocalizer is not thread safe.
> In DefaultTaskController.initializeJob method:
> JobLocalizer localizer = new JobLocalizer((JobConf)getConf(), user, jobid);
> but in JobLocalizer, it just simply keep the reference of the conf.
> When two TaskLauncher threads(mapLauncher and reduceLauncher) try to initializeJob at same time, it will have two JobLocalizer, but only one conf instance.
> So some times ttConf.setStrings(JOB_LOCAL_CTXT, localDirs) will reset previous job's conf.
> Then it will cause the previous job's job.xml stored at another user's dir.
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