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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3807) task attempt failing to report status just after the intialization
Date Thu, 14 Aug 2008 10:37:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622507#action_12622507
] 

Amareshwari Sriramadasu commented on HADOOP-3807:
-------------------------------------------------

Saw this exception many times.
The lines corresponding to the exception are
{code}
2139      TaskUmbilicalProtocol umbilical =
2140        (TaskUmbilicalProtocol)RPC.getProxy(TaskUmbilicalProtocol.class,
2141                                            TaskUmbilicalProtocol.versionID,
2142                                            address,
2143                                            defaultConf);
2144            
2145      Task task = umbilical.getTask(taskid);
2146     JobConf job = new JobConf(task.getJobFile());
2147      TaskLog.cleanup(job.getInt("mapred.userlog.retain.hours", 24));
{code}

Looks like exception is because RPC.getProxy is returning a *null* .

> task attempt failing to report status just after the intialization
> ------------------------------------------------------------------
>
>                 Key: HADOOP-3807
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3807
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Amareshwari Sriramadasu
>             Fix For: 0.19.0
>
>
> In sort500 runs, I noticed task attempts failing to report status : saying
> Task attempt_200807220707_0002_r_000336_1 failed to report status for 605 seconds. Killing!
> And the task logs has NullPointerException saying:
> *stderr logs*
> Exception in thread "main" java.lang.NullPointerException
> 	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2146)
> Task tracker logs for the same attempt are:
> 2008-07-22 08:07:37,110 INFO org.apache.hadoop.mapred.TaskTracker: LaunchTaskAction:
attempt_200807220707_0002_r_000336_1
> 2008-07-22 08:17:42,144 INFO org.apache.hadoop.mapred.TaskTracker: attempt_200807220707_0002_r_000336_1:
Task attempt_200807220707_0002_r_000336_1 failed toreport status for 605 seconds. Killing!
> 2008-07-22 08:17:42,162 INFO org.apache.hadoop.mapred.TaskTracker: About to purge task:
attempt_200807220707_0002_r_000336_1
> 2008-07-22 08:17:42,163 INFO org.apache.hadoop.mapred.TaskRunner: attempt_200807220707_0002_r_000336_1
done; removing files.
> 2008-07-22 08:18:15,481 WARN org.apache.hadoop.mapred.TaskTracker: Unknown child task
finshed: attempt_200807220707_0002_r_000336_1. Ignored.

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