[HADOOP-1013] ArithmeticException when number of racks is zero

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.11.0
• Fix Version/s: 0.11.2

Environment

EC2

• Assignee: Hairong Kuang
• Reporter: James P. White
• Created: 13/Feb/07 04:41
• Updated: 08/Jul/09 16:42
• Resolved: 01/Mar/07 02:04

Description

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]#

Issue Links

• is part of: HADOOP-972 Improve the rack-aware replica placement performance