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https://issues.apache.org/jira/browse/HADOOP-5850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12711522#action_12711522
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Amareshwari Sriramadasu commented on HADOOP-5850:
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Setting Map Progress and reduce progress to 1.0f should not be done in
updateTaskStatus() method, it can be done when setup completes in
completedTask().
Catching NullPointerException in testcase doesn't seem correct, just throw it
out if there is any.
> map/reduce doesn't run jobs with 0 maps
> ---------------------------------------
>
> Key: HADOOP-5850
> URL: https://issues.apache.org/jira/browse/HADOOP-5850
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Owen O'Malley
> Assignee: Vinod K V
> Priority: Critical
> Fix For: 0.20.1
>
> Attachments: HADOOP-5850-20090519.1.txt, HADOOP-5850-20090519.txt,
> HADOOP-5850-20090520-svn-branch-20.v2.txt, HADOOP-5850-20090520-svn.1.txt
>
>
> Currently, the framework ignores jobs that have 0 maps. This is incorrect.
> Many pipelines need the job to run (if nothing else, to create the output
> directory!) so that subsequent jobs don't fail. Effectively, there will be no
> map tasks and the reduce tasks should immediately set up the Reducer and
> RecordWriter and then call close on both since there are no inputs to the
> reduce. I believe it should just work if we remove the check...
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