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https://issues.apache.org/jira/browse/HADOOP-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12472763
 ] 

Hadoop QA commented on HADOOP-1009:
-----------------------------------

+1, because 
http://issues.apache.org/jira/secure/attachment/12350981/chooseTargetLoop.patch 
applied and successfully tested against trunk revision r506778.

> Infinite loop in chooseTarget
> -----------------------------
>
>                 Key: HADOOP-1009
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1009
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>            Reporter: dhruba borthakur
>         Assigned To: dhruba borthakur
>         Attachments: chooseTargetLoop.patch
>
>
> I am seeing the namenode hangs with 99% CPU usage. The stack trace invariably 
> shows the following stack trace.
>  - java.util.Random.next(int) @bci=35, line=141 (Compiled frame; information 
> may be imprecise)
>  - java.util.Random.nextInt(int) @bci=40, line=255 (Compiled frame)
>  - org.apache.hadoop.dfs.FSNamesystem$Replicator.chooseRandom(int, 
> org.apache.hadoop.dfs.DatanodeDescriptor[], java.util.List, long, int, 
> java.util.List) @bci=7, line=2986 (Interpreted frame)
>  - org.apache.hadoop.dfs.FSNamesystem$Replicator.chooseTarget(int, 
> org.apache.hadoop.dfs.DatanodeDescriptor, 
> org.apache.hadoop.dfs.DatanodeDescriptor[], java.util.List, long, int, 
> java.util.List) @bci=211, line=2810 (Interpreted frame)
>  - org.apache.hadoop.dfs.FSNamesystem$Replicator.chooseTarget(int, 
> org.apache.hadoop.dfs.DatanodeDescriptor, java.util.List, java.util.List, 
> long) @bci=141, line=2764 (Interpreted frame)
>  - org.apache.hadoop.dfs.FSNamesystem$Replicator.chooseTarget(int, 
> org.apache.hadoop.dfs.DatanodeDescriptor, java.util.List, long) @bci=25, 
> line=2716 (Interpreted frame)
>  - org.apache.hadoop.dfs.FSNamesystem.startFile(org.apache.hadoop.io.UTF8, 
> org.apache.hadoop.io.UTF8, org.apache.hadoop.io.UTF8, boolean, short, long) 
> @bci=579, line=709 (Interpreted frame)
>  - org.apache.hadoop.dfs.NameNode.create(java.lang.String, java.lang.String, 
> java.lang.String, boolean, short, long) @bci=97, line=270 (Interpreted frame)
>  - sun.reflect.GeneratedMethodAccessor5.invoke(java.lang.Object, 
> java.lang.Object[]) @bci=238 (Interpreted frame)
>  - sun.reflect.DelegatingMethodAccessorImpl.invoke(java.lang.Object, 
> java.lang.Object[]) @bci=6, line=25 (Interpreted frame)
>  - java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) 
> @bci=111, line=585 (Interpreted frame)
>  - org.apache.hadoop.ipc.RPC$Server.call(org.apache.hadoop.io.Writable) 
> @bci=64, line=337 (Compiled frame)
>  - org.apache.hadoop.ipc.Server$Handler.run() @bci=351, line=538 (Interpreted 
> frame)

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