[jira] [Commented] (MAPREDUCE-4395) Possible NPE at ClientDistributedCacheManager#determineTimestamps

["Bhallamudi Venkata Siva Kamesh (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406469#comment-13406469 ] 

Bhallamudi Venkata Siva Kamesh commented on MAPREDUCE-4395:
-----------------------------------------------------------

Here is an example.
{noformat}
Exception in thread "main" java.lang.NullPointerException
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:282)
	at org.apache.hadoop.mapreduce.filecache.ClientDistributedCacheManager.getFileStatus(ClientDistributedCacheManager.java:205)
	at org.apache.hadoop.mapreduce.filecache.ClientDistributedCacheManager.determineTimestamps(ClientDistributedCacheManager.java:77)
	at org.apache.hadoop.mapreduce.JobSubmitter.copyAndConfigureFiles(JobSubmitter.java:245)
	at org.apache.hadoop.mapreduce.JobSubmitter.copyAndConfigureFiles(JobSubmitter.java:283)
	at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:354)
{noformat}
                
> Possible NPE at ClientDistributedCacheManager#determineTimestamps
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-4395
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4395
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: distributed-cache, job submission, mrv2
>    Affects Versions: 3.0.0
>            Reporter: Bhallamudi Venkata Siva Kamesh
>            Assignee: Bhallamudi Venkata Siva Kamesh
>
> {code:title=ClientDistributedCacheManager#determineTimestamps|borderStyle=solid}
> URI[] tfiles = DistributedCache.getCacheFiles(job);
> {code}
> It may be possible that tfiles array contains *null* as it's entry, and subsequently leads to NPE.

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