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https://issues.apache.org/jira/browse/MAPREDUCE-6320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14502022#comment-14502022
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Jens Rabe commented on MAPREDUCE-6320:
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I was wrong in the first comment, the fix was introduced in commit
e8a31f2e1c34514fba2f480e8db652f6e2ed65d8 for MAPREDUCE-5875.
> Configuration of retrieved Job via Cluster is not properly set-up
> -----------------------------------------------------------------
>
> Key: MAPREDUCE-6320
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6320
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Jens Rabe
> Attachments: MAPREDUCE-6320.001.patch
>
>
> When getting a Job via the Cluster API, it is not correctly configured.
> To reproduce this:
> # Submit a MR job, and set some arbitrary parameter to its configuration
> {code:java}
> job.getConfiguration().set("foo", "bar");
> job.setJobName("foo-bug-demo");
> {code}
> # Get the job in a client:
> {code:java}
> final Cluster c = new Cluster(conf);
> final JobStatus[] statuses = c.getAllJobStatuses();
> final JobStatus s = ... // get the status for the job named foo-bug-demo
> final Job j = c.getJob(s.getJobId());
> final Configuration conf = job.getConfiguration();
> {code}
> # Get its "foo" entry
> {code:java}
> final String s = conf.get("foo");
> {code}
> # Expected: s is "bar"; But: s is null.
> The reason is that the job's configuration is stored on HDFS (the
> Configuration has a resource with a *hdfs://* URL) and in the *loadResource*
> it is changed to a path on the local file system
> (hdfs://host.domain:port/tmp/hadoop-yarn/... is changed to
> /tmp/hadoop-yarn/...), which does not exist, and thus the configuration is
> not populated.
> The bug happens in the *Cluster* class, where *JobConfs* are created from
> *status.getJobFile()*. A quick fix would be to copy this job file to a
> temporary file in the local file system and populate the JobConf from this
> file.
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