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https://issues.apache.org/jira/browse/HADOOP-4041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Philip Zeyliger updated HADOOP-4041:
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Status: Patch Available (was: Open)
> IsolationRunner does not work as documented
> -------------------------------------------
>
> Key: HADOOP-4041
> URL: https://issues.apache.org/jira/browse/HADOOP-4041
> Project: Hadoop Core
> Issue Type: Bug
> Components: documentation, mapred
> Affects Versions: 0.18.0
> Reporter: Yuri Pradkin
> Assignee: Philip Zeyliger
> Attachments: HADOOP-4041-v2.patch, HADOOP-4041-v3.patch,
> HADOOP-4041-v4.patch, hadoop-4041.patch
>
>
> IsolationRunner does not work as documented in the tutorial.
> The tutorial says "To use the IsolationRunner, first set
> keep.failed.tasks.files to true (also see keep.tasks.files.pattern)."
> Should be:
> keep.failed.task.files (not tasks)
> After the above was set (quoted from my message on hadoop-core):
> > After the task
> > hung, I failed it via the web interface. Then I went to the node that was
> > running this task
> >
> > $ cd ...local/taskTracker/jobcache/job_200808071645_0001/work
> > (this path is already different from the tutorial's)
> >
> > $ hadoop org.apache.hadoop.mapred.IsolationRunner ../job.xml
> > Exception in thread "main" java.lang.NullPointerException
> > at
> > org.apache.hadoop.mapred.IsolationRunner.main(IsolationRunner.java:164)
> >
> > Looking at IsolationRunner code, I see this:
> >
> > 164 File workDirName = new File(lDirAlloc.getLocalPathToRead(
> > 165 TaskTracker.getJobCacheSubdir()
> > 166 + Path.SEPARATOR +
> > taskId.getJobID()
> > 167 + Path.SEPARATOR + taskId
> > 168 + Path.SEPARATOR + "work",
> > 169 conf). toString());
> >
> > I.e. it assumes there is supposed to be a taskID subdirectory under the job
> > dir, but:
> > $ pwd
> > ...mapred/local/taskTracker/jobcache/job_200808071645_0001
> > $ ls
> > jars job.xml work
> >
> > -- it's not there.
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