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https://issues.apache.org/jira/browse/MAPREDUCE-118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12856552#action_12856552
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Tom White commented on MAPREDUCE-118:
-------------------------------------
+1 to Amareshwari's changes. They fix Job#getJobID() within the current (0.20)
API. I think patch-118-0.20.txt can be committed to the 0.20 branch, and
patch-118-1.txt to trunk (which will go into the forthcoming 0.21 release).
> Job.getJobID() will always return null
> --------------------------------------
>
> Key: MAPREDUCE-118
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-118
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.20.1
> Reporter: Amar Kamat
> Assignee: Amareshwari Sriramadasu
> Priority: Blocker
> Fix For: 0.21.0
>
> Attachments: patch-118-0.20.txt, patch-118-0.21.txt, patch-118-1.txt,
> patch-118.txt
>
>
> JobContext is used for a read-only view of job's info. Hence all the readonly
> fields in JobContext are set in the constructor. Job extends JobContext. When
> a Job is created, jobid is not known and hence there is no way to set JobID
> once Job is created. JobID is obtained only when the JobClient queries the
> jobTracker for a job-id., which happens later i.e upon job submission.
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