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https://issues.apache.org/jira/browse/HADOOP-1171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christian Kunz updated HADOOP-1171:
-----------------------------------
Affects Version/s: 0.18.2
Assignee: (was: Tahir Hashmi)
Our Jobtracker lost connections to tasktrackers for a while, probably because
of some network problem, and when they came back they got reinitialized with
the result that they crashed with a NPE (we lost 90% of tasktrackers this way)
Typical log from jobtracker:
2009-01-17 04:23:02,185 WARN org.apache.hadoop.mapred.JobTracker: Serious
problem, cannot find record of 'previous' heartbeat for
'tracker_xxx:localhost/127.0.0.1:60944'; reinitializing the tasktracker
Typical exception
2009-01-17 05:00:50,735 ERROR org.apache.hadoop.mapred.TaskTracker: Can not
start task tracker because java.lang.NullPointerException
at org.apache.hadoop.mapred.TaskTracker.initialize(TaskTracker.java:434)
at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:1364)
at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:2355)
> NPE in TaskTracker RenitTrackerAction
> --------------------------------------
>
> Key: HADOOP-1171
> URL: https://issues.apache.org/jira/browse/HADOOP-1171
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.12.1, 0.18.2
> Reporter: Koji Noguchi
>
> TaskTracker log shows =============
> 2007-03-28 02:32:18,076 INFO org.apache.hadoop.mapred.TaskTracker: Recieved
> RenitTrackerAction from JobTracker
> 2007-03-28 02:32:18,494 ERROR org.apache.hadoop.mapred.TaskTracker: Can not
> start task tracker because java.lang.NullPointerException
> at
> org.apache.hadoop.mapred.TaskTracker$TaskInProgress.jobHasFinished(TaskTracker.java:1187)
> at org.apache.hadoop.mapred.TaskTracker.close(TaskTracker.java:430)
> at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:917)
> at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:1589)
> JobTracker log shows ==============
> 2007-03-28 02:31:18,977 INFO org.apache.hadoop.mapred.JobTracker: Lost
> tracker '____.____.com'
> ...
> 2007-03-28 02:31:18,977 INFO org.apache.hadoop.mapred.JobInProgress:
> TaskTracker at 'tracker____.___.com' turned 'flaky'
> ...
> 2007-03-28 02:32:18,075 WARN org.apache.hadoop.mapred.JobTracker: Status from
> unknown Tracker : tracker____.___.com:#####
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