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