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https://issues.apache.org/jira/browse/MAPREDUCE-4689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jason Lowe updated MAPREDUCE-4689:
----------------------------------
Attachment: MAPREDUCE-4689.patch
Patch to CompletedTask so it returns empty counters instead of null counters in
the task report.
In addition to unit test, I also manually tested it with a fail job and
verified that JobClient.getMapTaskReports did not throw an NPE when it
redirected to the historyserver for the failed job.
> JobClient.getMapTaskReports on failed job results in NPE
> --------------------------------------------------------
>
> Key: MAPREDUCE-4689
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4689
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: client
> Affects Versions: 0.23.3
> Reporter: Jason Lowe
> Attachments: MAPREDUCE-4689.patch
>
>
> When calling JobClient.getMapTaskReports for a job that has failed results in
> an NPE. For example:
> {noformat}
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.hadoop.mapreduce.counters.AbstractCounters.<init>(AbstractCounters.java:107)
> at org.apache.hadoop.mapred.Counters.<init>(Counters.java:71)
> at org.apache.hadoop.mapred.Counters.downgrade(Counters.java:80)
> at org.apache.hadoop.mapred.TaskReport.downgrade(TaskReport.java:81)
> at
> org.apache.hadoop.mapred.TaskReport.downgradeArray(TaskReport.java:88)
> at org.apache.hadoop.mapred.JobClient.getTaskReports(JobClient.java:691)
> at
> org.apache.hadoop.mapred.JobClient.getMapTaskReports(JobClient.java:681)
> ...
> {noformat}
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