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Date: Wed, 20 May 2009 11:43:45 -0700 (PDT)
From: "Philip Zeyliger (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4041) IsolationRunner does not work as
 documented
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    [ https://issues.apache.org/jira/browse/HADOOP-4041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12711287#action_12711287 ] 

Philip Zeyliger commented on HADOOP-4041:
-----------------------------------------

I'm going to take a stab at this this week.

> 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
>         Attachments: 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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