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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 10:56:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532386
] 

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

this was on trunk.. 

the task trackers try to fetch the FS from JobClient which in effect asks JT for it's correspoding
FS.. which wasn't up yet.
This is the exception trace on teh TT

2007-10-03 14:18:21,132 INFO org.apache.hadoop.mapred.TaskTracker: Lost connection to JobTracker
[[TT_address]/[TT_IP]:50020].  Retrying...
org.apache.hadoop.ipc.RemoteException: java.io.IOException: java.lang.NullPointerException
        at org.apache.hadoop.mapred.JobTracker.getFilesystemName(JobTracker.java:1458)
        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
        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)

        at org.apache.hadoop.ipc.Client.call(Client.java:470)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:165)
        at org.apache.hadoop.mapred.$Proxy0.getFilesystemName(Unknown Source)
        at org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:773)
        at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:1179)
        at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:1870)


> 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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