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https://issues.apache.org/jira/browse/MAPREDUCE-2307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13011109#comment-13011109
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Devaraj K commented on MAPREDUCE-2307:
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If the allocFile is null, it is already logging the message in the initialize()
method. When the reloadAllocsIfNecessary() invokes with allocFile is null, it
encounters NullPointerException, catching and logging that NullPointerException
may not be good.
> Exception thrown in Jobtracker logs, when the Scheduler configured is
> FairScheduler.
> ------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2307
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2307
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/fair-share
> Affects Versions: 0.23.0
> Reporter: Devaraj K
> Priority: Minor
> Fix For: 0.23.0
>
> Attachments: MAPREDUCE-2307.patch
>
>
> If we try to start the job tracker with fair scheduler using the default
> configuration, It is giving the below exception.
> {code:xml}
> 2010-07-03 10:18:27,142 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 2 on 9001: starting
> 2010-07-03 10:18:27,143 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 3 on 9001: starting
> 2010-07-03 10:18:27,143 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 4 on 9001: starting
> 2010-07-03 10:18:27,143 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 5 on 9001: starting
> 2010-07-03 10:18:27,143 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 6 on 9001: starting
> 2010-07-03 10:18:27,143 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 7 on 9001: starting
> 2010-07-03 10:18:27,143 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 8 on 9001: starting
> 2010-07-03 10:18:27,143 INFO org.apache.hadoop.mapred.JobTracker: Starting
> RUNNING
> 2010-07-03 10:18:27,143 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 9 on 9001: starting
> 2010-07-03 10:18:28,037 INFO org.apache.hadoop.net.NetworkTopology: Adding a
> new node: /default-rack/linux172.site
> 2010-07-03 10:18:28,090 INFO org.apache.hadoop.net.NetworkTopology: Adding a
> new node: /default-rack/linux177.site
> 2010-07-03 10:18:40,074 ERROR org.apache.hadoop.mapred.PoolManager: Failed to
> reload allocations file - will use existing allocations.
> java.lang.NullPointerException
> at java.io.File.<init>(File.java:222)
> at
> org.apache.hadoop.mapred.PoolManager.reloadAllocsIfNecessary(PoolManager.java:127)
> at org.apache.hadoop.mapred.FairScheduler.assignTasks(FairScheduler.java:234)
> at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:2785)
> 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$Server.call(RPC.java:513)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:984)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:980)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:978)
> {code}
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