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From "Philip Zeyliger (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4041) IsolationRunner does not work as documented
Date Mon, 15 Jun 2009 03:36:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Philip Zeyliger updated HADOOP-4041:
------------------------------------

    Comment: was deleted

(was: bq. In DistributedCacheHandle the class doc should go before the class declaration,
not at the beginning of the file. Also need to add Apache license.

Done.

bq. Use an enum rather than a boolean for isArchive in CacheFile.

Done.

bq. We shouldn't remove public methods to DistributedCache, but rather deprecate them and
remove them in a future release. Can DistributedCache delegate to DistributedCacheManager?
I like the fact you have documented the intended audience for each public method of DistributedCache.
(This paves the way to separating the public and private interfaces in future.)

Done.

My current thinking on APIs (for a future JIRA) is that users should access DistributedCache
through Job.addToCache(URI, flags) and Context.getCachedFiles().  But there's some more work
to get there.

bq. Is there duplication between TestMRWithDistributedCache and tests that use MRCaching that
could be avoided?

Probably, but it's hard to tease out.  MRCaching is more complicated than the test I'm adding,
and does, I believe, test some things that I don't.  On the other hand, TestMRWithDistributedCache
tests the classpath stuff.  I'm loath to delete tests too eagerly.

bq. Could TestMRWithDistributedCache also test symlinking?

It does now test symlinking.  However, I couldn't (easily) get LocalJobRunner to do symlinks
appropriately.  LocalJobRunner doesn't currently have a notion of task directory, and I think
this patch is already quite large.)

> 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, org.apache.hadoop.fs.LocalDirAllocator.html
>
>
> 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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