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https://issues.apache.org/jira/browse/MAPREDUCE-4843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13509730#comment-13509730
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zhaoyunjiong commented on MAPREDUCE-4843:
-----------------------------------------
The fix is very simple:
diff --git a/src/mapred/org/apache/hadoop/mapred/JobLocalizer.java
b/src/mapred/org/apache/hadoop/mapred/JobLocalizer.java
index 0802b03..625face 100644
--- a/src/mapred/org/apache/hadoop/mapred/JobLocalizer.java
+++ b/src/mapred/org/apache/hadoop/mapred/JobLocalizer.java
@@ -108,7 +108,7 @@ public class JobLocalizer {
throw new IOException("Cannot initialize for null jobid");
}
this.jobid = jobid;
- this.ttConf = ttConf;
+ this.ttConf = new JobConf(ttConf);
lfs = FileSystem.getLocal(ttConf).getRaw();
this.localDirs = createPaths(user, localDirs);
ttConf.setStrings(JOB_LOCAL_CTXT, localDirs);
> 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
> Priority: Critical
>
> In our cluster, some times job will failed due to below exception:
> Error initializing attempt_201210181806_18566_r_000376_0:
> org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find
> taskTracker/$username/jobcache/job_201210181806_18566/job.xml in any of the
> configured local directories at
> org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathToRead(LocalDirAllocator.java:424)
> 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 one conf
> instance.
> So some times ttConf.setStrings(JOB_LOCAL_CTXT, localDirs) will reset
> previous job's conf.
> It will cause the previous job's job.xml stored at another user's dir.
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