[jira] [Updated] (MAPREDUCE-6535) TaskID default constructor results in NPE on toString()

["Daniel Templeton (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-6535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Templeton updated MAPREDUCE-6535:
----------------------------------------
    Attachment: MAPREDUCE-6535.001.patch

This patch sets the default task type to REDUCE.  It also fixes all the javadocs and add a full set of unit tests.

> 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
>         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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