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From "Gautam Kowshik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1973) NPE at JobTracker startup..
Date Thu, 04 Oct 2007 11:06:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532389
] 

Gautam Kowshik commented on HADOOP-1973:
----------------------------------------

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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