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https://issues.apache.org/jira/browse/MAPREDUCE-6535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15212421#comment-15212421
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Hudson commented on MAPREDUCE-6535:
-----------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #9500 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/9500/])
MAPREDUCE-6535. TaskID default constructor results in NPE on toString().
(jlowe: rev 3f622a143c5fb15fee7e5dded99e4a4136f19810)
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/TaskID.java
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/TestTaskID.java
> TaskID default constructor results in NPE on toString()
> -------------------------------------------------------
>
> Key: MAPREDUCE-6535
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6535
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 2.6.0
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
> Fix For: 2.9.0
>
> Attachments: MAPREDUCE-6535.001.patch
>
>
> This code will reproduce the issue:
> {code}
> new TaskAttemptID().toString();
> {code}
> The issue is that the default constructor leaves the type {{null}}. The
> {{get()}} in {{CharTaskTypesMaps.getRepresentingCharacter()}} then throws an
> NPE on the null type key.
> The simplest solution would be to only call the {{get()}} on line 288 of
> {{TaskID.java}} if {{type}} is not {{null}} and return some other literal
> otherwise. Since no part of the code is tripping on the NPE, what we choose
> for the literal shouldn't matter. How about "x"?
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