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https://issues.apache.org/jira/browse/MAPREDUCE-6535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14992181#comment-14992181
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Rakesh commented on MAPREDUCE-6535:
-----------------------------------
I agree with above solution to make it default to TaskType.REDUCE as we found
this issue in reduce phase while creating custom output format to create
different directories based on the key.
Thanks for prompt response on this. Please let me know if I can provide a fix
on this.
> 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
>
> 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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