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https://issues.apache.org/jira/browse/HADOOP-1973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532389
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Gautam Kowshik commented on HADOOP-1973:
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let me correct myself from earlier.. the JT does not shutdown after these
exceptions.. this problem has no effect on the cluster's health. Only that we
see bunch of exceptions till the namenode is fully up with the data nodes
registered.
> NPE at JobTracker startup..
> ---------------------------
>
> Key: HADOOP-1973
> URL: https://issues.apache.org/jira/browse/HADOOP-1973
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.14.1
> Reporter: Gautam Kowshik
>
> At JT startup a bunch of these were thrown.. and the JT shutdown.
> 2007-10-01 07:48:36,501 WARN org.apache.hadoop.mapred.JobTracker: Serious
> problem, cannot find record of 'previous' heartbeat for
> '[tracker_address]:/127.0.0.1:40205'; reinitializing the tasktracker
> 2007-10-01 07:48:36,504 WARN org.apache.hadoop.mapred.JobTracker: Serious
> problem, cannot find record of 'previous' heartbeat for
> '[tracker_address]:/127.0.0.1:57935'; reinitializing the tasktracker
> 2007-10-01 07:48:36,520 WARN org.apache.hadoop.mapred.JobTracker: Serious
> problem, cannot find record of 'previous' heartbeat for
> '[tracker_address]:/127.0.0.1:46305'; reinitializing the tasktracker
> 2007-10-01 07:48:36,523 WARN org.apache.hadoop.mapred.JobTracker: Serious
> problem, cannot find record of 'previous' heartbeat for
> '[tracker_address]:/127.0.0.1:55988'; reinitializing the tasktracker
> 2007-10-01 07:48:36,524 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 28 on 50020, call getFilesystemName() from [tracker_ip]:47361: error:
> java.io.IOException: java.lang.NullPointerException
> java.io.IOException: java.lang.NullPointerException
> at
> org.apache.hadoop.mapred.JobTracker.getFilesystemName(JobTracker.java:1458)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:340)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:596)
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