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https://issues.apache.org/jira/browse/HADOOP-5375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677961#action_12677961
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Vinod K V commented on HADOOP-5375:
-----------------------------------
A quick look at the code suggests that the problem is with the following in
JobTracker.java +3210 in lostTracker() method:
{code}
TaskInProgress tip = taskidToTIPMap.get(taskId);
JobInProgress job = tip.getJob();
{code}
If the job is completed/removed from the memory, this would result in an NPE.
Not sure if there are any more such places.
> NPE in tracker expiry thread.
> -----------------------------
>
> Key: HADOOP-5375
> URL: https://issues.apache.org/jira/browse/HADOOP-5375
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Vinod K V
>
> I see NullPointerExceptions in Task Expiry thread of the JobTracker.
> Exception log in JT:
> {code}
> 2009-02-28 07:22:51,392 ERROR org.apache.hadoop.mapred.JobTracker: Tracker
> Expiry Thread got exception: java.lang.NullPointerException
> {code}
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