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
