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https://issues.apache.org/jira/browse/MAPREDUCE-5452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13848798#comment-13848798
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Andrey Klochkov commented on MAPREDUCE-5452:
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This actually leads to non minor issues in downstream projects. See HIVE-4216
> NPE in TaskID toString when default constructor is used
> -------------------------------------------------------
>
> Key: MAPREDUCE-5452
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5452
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.0.5-alpha
> Reporter: Brock Noland
> Priority: Minor
>
> If you call TaskID.toString() after using the default the constructor
> toString() NPE's because taskType is null.
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