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From Something Something <mailinglist...@gmail.com>
Subject Error: could only be replicated to 0 nodes, instead of 1
Date Mon, 22 Mar 2010 17:11:31 GMT
After upgrading to hadoop-0.20.2, I started seeing these messages in the
log:


2010-03-22 09:56:28,393 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 1 on 9000, call addBlock(/home/training/hadoop/mapred/system/
jobtracker.info, DFSClient_-1956918169) from 127.0.0.1:41067: error:
java.io.IOException: File /home/training/hadoop/mapred/system/
jobtracker.info could only be replicated to 0 nodes, instead of 1
java.io.IOException: File /home/training/hadoop/mapred/system/
jobtracker.info could only be replicated to 0 nodes, instead of 1
        at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1271)
        at
org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:422)
        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.ipc.RPC$Server.call(RPC.java:508)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)


I am running in Psuedo-distributed mode.  Before upgrading I used to see
these messages occasionally, but they were harmless.  Now I see these when I
try to copy files to DFS using -copyFromLocal, and the files no longer get
copied :(

I mean, it's quite possible, this has nothing to do with the Hadoop upgrade
but something changed in my environment, but any help will be appreciated.
 Thanks.

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