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https://issues.apache.org/jira/browse/MAPREDUCE-111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085546#comment-13085546
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Subroto Sanyal commented on MAPREDUCE-111:
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Hi Amreshwari/Abhijit,
To call the public API *org.apache.hadoop.mapred.JobTracker.getSystemDir()* we
must have the instance of *JobTracker*. When the call to *JobTracker*
constructor is made, the constructor makes sure that *FileSystem* is
initialized.
Please let me know if I am missing any point where *FileSystem* will not be
initialized but, the *JobTracker* will be.
As per my understanding if we introduce such checks, we will end up making null
checks in all public APIs leading to too much defensive coding.
> JobTracker.getSystemDir throws NPE if it is called during intialization
> -----------------------------------------------------------------------
>
> Key: MAPREDUCE-111
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-111
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Reporter: Amareshwari Sriramadasu
>
> JobTracker.getSystemDir throws NPE if it is called during intialization.
> It should check if fileSystem is null and throw IllegalStateException, as in
> getFilesystemName method.
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