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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1013) ArithmeticException when number of racks is zero
Date Tue, 13 Feb 2007 21:08:06 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12472867
] 

Hairong Kuang commented on HADOOP-1013:
---------------------------------------

Tom, Thanks for clarification. I agree that replica placement should not throw an exception
when there are no registered datanodes. But if zero rack is caused by zero registered datanode,
it will be a simple fix.

> ArithmeticException when number of racks is zero
> ------------------------------------------------
>
>                 Key: HADOOP-1013
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1013
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.11.0
>         Environment: EC2
>            Reporter: James P. White
>         Assigned To: Hairong Kuang
>
> It seems that if something is wrong in the configuration that results in the number of
racks being zero, the symptom is a divide-by-zero exception.
> [root@domU-12-31-34-00-03-2F ~]# cd /usr/local/hadoop-0.11.0/
> [root@domU-12-31-34-00-03-2F hadoop-0.11.0]# bin/hadoop jar hadoop-0.11.0-examples.jar
pi 10 10000000
> Number of Maps = 10 Samples per Map = 10000000
> org.apache.hadoop.ipc.RemoteException: java.io.IOException: java.lang.ArithmeticException:
/ by zero
>         at org.apache.hadoop.dfs.FSNamesystem$Replicator.chooseTarget(FSNamesystem.java:2593)
>         at org.apache.hadoop.dfs.FSNamesystem$Replicator.chooseTarget(FSNamesystem.java:2555)
>         at org.apache.hadoop.dfs.FSNamesystem.startFile(FSNamesystem.java:684)
>         at org.apache.hadoop.dfs.NameNode.create(NameNode.java:248)
>         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:585)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:337)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:538)
>         at org.apache.hadoop.ipc.Client.call(Client.java:467)
>         at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:164)
>         at org.apache.hadoop.dfs.$Proxy0.create(Unknown Source)
>         at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.locateNewBlock(DFSClient.java:1091)
>         at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:1031)
>         at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.endBlock(DFSClient.java:1255)
>         at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.close(DFSClient.java:1345)
>         at java.io.FilterOutputStream.close(FilterOutputStream.java:143)
>         at java.io.FilterOutputStream.close(FilterOutputStream.java:143)
>         at java.io.FilterOutputStream.close(FilterOutputStream.java:143)
>         at org.apache.hadoop.fs.FSDataOutputStream$Summer.close(FSDataOutputStream.java:98)
>         at java.io.FilterOutputStream.close(FilterOutputStream.java:143)
>         at java.io.FilterOutputStream.close(FilterOutputStream.java:143)
>         at java.io.FilterOutputStream.close(FilterOutputStream.java:143)
>         at org.apache.hadoop.io.SequenceFile$Writer.close(SequenceFile.java:724)
>         at org.apache.hadoop.examples.PiEstimator.launch(PiEstimator.java:185)
>         at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:226)
>         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:585)
>         at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)
>         at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:143)
>         at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:40)
>         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:585)
>         at org.apache.hadoop.util.RunJar.main(RunJar.java:155)
> [root@domU-12-31-34-00-03-2F hadoop-0.11.0]# 

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