Hi Phil,

Typically, this is due to running inconsistent versions of the Hadoop, right?

I would compare the output of 'md5sum' on the NN versus the DN for the various 
Hadoop JARs.

If you do "jar tf" on the jar you added to $HADOOP_HOME/lib, did it 
inadvertently add another implementation of the NN classes?

Brian

On Oct 25, 2010, at 6:12 PM, phil young wrote:

> Wow. I could use help quickly...
> 
> My name node is reporting a null BV. All the data nodes report the same
> Build Version.
> We were not upgrading the DFS, but did stop, restart, after adding a jar to
> $HADOOP_HOME/lib.
> So, we think we understand the cause.
> 
> Web searching shows a number of people have had this issue, but I don't see
> a response to the plea here for advice on repairing the problem:
> http://old.nabble.com/namenode-failure-td20199395.html
> 
> 
> -- Here's a log from a DataNode
> /************************************************************
> STARTUP_MSG: Starting DataNode
> STARTUP_MSG:   host = hdp12n.tripadvisor.com/192.168.33.231
> STARTUP_MSG:   args = []
> STARTUP_MSG:   version = 0.20.2
> STARTUP_MSG:   build =
> https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r
> 911707; compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010
> ************************************************************/
> 2010-10-25 18:23:07,081 FATAL
> org.apache.hadoop.hdfs.server.datanode.DataNode: Incompatible build
> versions: namenode BV = ; datanode BV = 911707
> 2010-10-25 18:23:07,186 ERROR
> org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException:
> Incompatible build versions: namenode BV = ; datanode BV = 911707
> at
> org.apache.hadoop.hdfs.server.datanode.DataNode.handshake(DataNode.java:436)
> at
> org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:275)
> at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:216)
> at
> org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1283)
> at
> org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1238)
> at
> org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1246)
> at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1368)
> 
> 2010-10-25 18:23:07,187 INFO
> org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
> /************************************************************
> SHUTDOWN_MSG: Shutting down DataNode at
> hdp12n.tripadvisor.com/192.168.33.231
> 
> -- This is from the NameNode
> 
> 2010-10-25 18:38:58,760 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.audit:
> ugi=root,root,bin,daemon,sys,adm,disk,wheel ip=/192.168.33.230
> cmd=listStatus src=/disk1/hadoop-root/mapred/system dst=null perm=null
> 2010-10-25 18:38:58,764 INFO org.apache.hadoop.ipc.Server: IPC Server
> handler 9 on 54310, call delete(/disk1/hadoop-root/mapred/system, true) from
> 192.168.33.230:44574: error:
> org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete
> /disk1/hadoop-root/mapred/system. Name node is in safe mode.
> The ratio of reported blocks 0.0000 has not reached the threshold 0.9990.
> Safe mode will be turned off automatically.
> org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete
> /disk1/hadoop-root/mapred/system. Name node is in safe mode.
> The ratio of reported blocks 0.0000 has not reached the threshold 0.9990.
> Safe mode will be turned off automatically.
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.deleteInternal(FSNamesystem.java:1700)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:1680)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.delete(NameNode.java:517)
> at sun.reflect.GeneratedMethodAccessor5.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: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)
> 2010-10-25 18:39:08,770 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.audit:
> ugi=root,root,bin,daemon,sys,adm,disk,wheel ip=/192.168.33.230
> cmd=listStatus src=/disk1/hadoop-root/mapred/system dst=null perm=null
> 2010-10-25 18:39:08,774 INFO org.apache.hadoop.ipc.Server: IPC Server
> handler 0 on 54310, call delete(/disk1/hadoop-root/mapred/system, true) from
> 192.168.33.230:44574: error:
> org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete
> /disk1/hadoop-root/mapred/system. Name node is in safe mode.
> The ratio of reported blocks 0.0000 has not reached the threshold 0.9990.
> Safe mode will be turned off automatically.
> org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete
> /disk1/hadoop-root/mapred/system. Name node is in safe mode.
> The ratio of reported blocks 0.0000 has not reached the threshold 0.9990.
> Safe mode will be turned off automatically.
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.deleteInternal(FSNamesystem.java:1700)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:1680)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.delete(NameNode.java:517)
> at sun.reflect.GeneratedMethodAccessor5.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$Server.call(RPC.java:508)
> at org.apache.hadoop.ipc.Server$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)
> 2010-10-25 18:39:09,504 INFO
> org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:
> /************************************************************
> SHUTDOWN_MSG: Shutting down NameNode at
> hdp11an.tripadvisor.com/192.168.33.228
> ************************************************************/
> 
> [r...@hdp11an current]# ls -l /disk1/hadoop-root/
> total 4
> drwxr-xr-x 4 root root 4096 Oct 22 10:11 hadoop-unjar1448904914513586870

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