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From Guy Doulberg <Guy.Doulb...@conduit.com>
Subject We are looking to the root of the problem that caused us IOException
Date Tue, 05 Apr 2011 06:53:23 GMT
Hey guys,

We are trying to figure out why many of our Map/Reduce job on the cluster are failing.
In log we are getting this message I n the failing jobs:


org.apache.hadoop.ipc.RemoteException: java.io.IOException: File **a filename*** could only
be replicated to 0 nodes, instead of 1

        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1282)

        at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:469)

        at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)

        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:512)

        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:968)

        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:964)

        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:962)



        at org.apache.hadoop.ipc.Client.call(Client.java:818)

        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:221)

        at $Proxy1.addBlock(Unknown Source)

        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.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)

        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)

        at $Proxy1.addBlock(Unknown Source)

        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:2932)

        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2807)

        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2087)

        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2274)



Where should we look?
What are the candidates to be the root of this message?

Thanks, Guy




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