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https://issues.apache.org/jira/browse/MAPREDUCE-5628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karthik Kambatla resolved MAPREDUCE-5628.
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Resolution: Not A Problem
My bad. Token#getTrackingId() never returns null.
> Tracking ids only for HDFS tokens should be included in jobconf
> ---------------------------------------------------------------
>
> Key: MAPREDUCE-5628
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5628
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: job submission
> Affects Versions: 2.2.0
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Priority: Critical
>
> MAPREDUCE-5379 adds the ability to track HDFS accesses of an MR job by adding
> the tracking-ids from all the tokens to the jobconf. However, only HDFS
> delegation tokens have a tracking-id. Trying to fetch tracking-ids from other
> tokens can lead to an NPE.
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