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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1009) Infinite loop in chooseTarget
Date Mon, 12 Feb 2007 17:48:05 GMT
Infinite loop in chooseTarget
-----------------------------

                 Key: HADOOP-1009
                 URL: https://issues.apache.org/jira/browse/HADOOP-1009
             Project: Hadoop
          Issue Type: Bug
            Reporter: dhruba borthakur


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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