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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5389) NullPointerException in fairshare PoolManager
Date Wed, 04 Mar 2009 08:15:56 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678630#action_12678630
] 

Vinod K V commented on HADOOP-5389:
-----------------------------------

If mapred.fairscheduler.allocation.file is not set to anything, then this exception will be
seen once in the logs, but scheduler should continue to function normally. You should not
see any other side effects because of this.  Nige, can you confirm this?

> NullPointerException in fairshare PoolManager
> ---------------------------------------------
>
>                 Key: HADOOP-5389
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5389
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/fair-share
>    Affects Versions: 0.20.0
>            Reporter: Nigel Daley
>            Assignee: Vinod K V
>
> Found this NPE in a Hadoop 0.20.0 JobTracker log:
> {code}
> 2009-03-03 23:55:22,824 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:119)
>         at org.apache.hadoop.mapred.FairScheduler.assignTasks(FairScheduler.java:226)
>         at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:2340)
>         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$Server.call(RPC.java:508)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:396)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
> {code}

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