[
https://issues.apache.org/jira/browse/MAPREDUCE-3808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201474#comment-13201474
]
Robert Joseph Evans commented on MAPREDUCE-3808:
------------------------------------------------
OK I am a bit confused here. Why is it allowed to run a map only job that does
not have an output directory set? The FileOutputFormat blows up if there are
any reduces and the output directory is not set, but for a map only job it is
fine. What is supposed to happen in that situation? I can replicate it, but I
don't know what the previous behavior was.
> NPE in FileOutputCommitter when running a 0 reduce job
> ------------------------------------------------------
>
> Key: MAPREDUCE-3808
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3808
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.0
> Reporter: Siddharth Seth
> Assignee: Robert Joseph Evans
> Priority: Blocker
>
> This was while running LoadGen.
> {noformat}
> Error: java.lang.NullPointerException at
> org.apache.hadoop.fs.Path.<init>(Path.java:67)
> at org.apache.hadoop.fs.Path.<init>(Path.java:56)
> at
> org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.getPendingJobAttemptsPath(FileOutputCommitter.java:118)
>
> at
> org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.getJobAttemptPath(FileOutputCommitter.java:167)
>
> at
> org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.getJobAttemptPath(FileOutputCommitter.java:149)
>
> at
> org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.getPendingTaskAttemptsPath(FileOutputCommitter.java:185)
>
> at
> org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.getTaskAttemptPath(FileOutputCommitter.java:209)
>
> at
> org.apache.hadoop.mapred.FileOutputCommitter.getTaskAttemptPath(FileOutputCommitter.java:100)
>
> at
> org.apache.hadoop.mapred.FileOutputCommitter.getTaskAttemptPath(FileOutputCommitter.java:94)
>
> at
> org.apache.hadoop.mapred.FileOutputCommitter.needsTaskCommit(FileOutputCommitter.java:176)
>
> at
> org.apache.hadoop.mapred.OutputCommitter.needsTaskCommit(OutputCommitter.java:248)
>
> at org.apache.hadoop.mapred.Task.isCommitRequired(Task.java:955)
> at org.apache.hadoop.mapred.Task.done(Task.java:912)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:331)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:147)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1157)
>
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:142)
> {noformat}
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
