[jira] Updated: (MAPREDUCE-754) NPE in expiry thread when a TT is lost

["Amar Kamat (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amar Kamat updated MAPREDUCE-754:
---------------------------------

    Attachment: mapreduce-754-v1.0.patch

Attaching a file that fixes the error on uniqueHostsMap. With this patch the uniqueHostsMap add/remove operations will be done only in JobTracker.updateTaskTrackerStatuses(). Result of test-patch
[exec] +1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 3 new or modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler warnings.
     [exec] 
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
     [exec] 
     [exec]     +1 release audit.  The applied patch does not increase the total number of release audit warnings.

Testing in progress.

> NPE in expiry thread when a TT is lost
> --------------------------------------
>
>                 Key: MAPREDUCE-754
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-754
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>            Reporter: Ramya R
>            Priority: Minor
>         Attachments: mapreduce-754-wip.patch
>
>
> NullPointerException is obtained in Tracker Expiry Thread. Below is the exception obtained in the JT logs 
> {noformat}
> ERROR org.apache.hadoop.mapred.JobTracker: Tracker Expiry Thread got exception: java.lang.NullPointerException
>         at org.apache.hadoop.mapred.JobTracker.updateTaskTrackerStatus(JobTracker.java:2971)
>         at org.apache.hadoop.mapred.JobTracker.access$300(JobTracker.java:104)
>         at org.apache.hadoop.mapred.JobTracker$ExpireTrackers.run(JobTracker.java:381)
>         at java.lang.Thread.run(Thread.java:619)
> {noformat}
> The steps to reproduce this issue are:
> * Blacklist a TT. 
> * Restart it. 
> * The above exception is obtained when the first instance of TT is marked as lost.
> However the above exception does not break any functionality.

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