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HDFS, mail # user - Is it possible to recover name node just using the meta data in a new machine


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Is it possible to recover name node just using the meta data in a new machine
Jeff Zhang 2010-05-21, 04:35
Hi all,

I'd like to recover the name node in another new machine. I copy the
meta data from the old name node to the new name node, and then modify
the configuration (including the fs.default.name). Then I stop the old
dfs cluster, and restart the new dfs cluster on the new machine, then
I get the following error message ( anyone has any ideas ?)

2010-05-21 01:02:37,552 INFO org.apache.hadoop.http.HttpServer: Port
returned by webServer.getConnectors()[0].getLocalPort() before open()
is -1. Opening the listener on 500702010-05-21 01:02:37,554 WARN
org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
ReplicationMonitor thread received
InterruptedException.java.lang.InterruptedException: sleep
interrupted2010-05-21 01:02:37,555 INFO
org.apache.hadoop.hdfs.server.namenode.DecommissionManager:
Interrupted Monitorjava.lang.InterruptedException: sleep interrupted
        at java.lang.Thread.sleep(Native Method)
        at org.apache.hadoop.hdfs.server.namenode.DecommissionManager$Monitor.run(DecommissionManager.
java:65)
        at java.lang.Thread.run(Thread.java:619)
2010-05-21 01:02:37,556 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of
transactio
ns: 0 Total time for transactions(ms): 0Number of transactions batched
in Syncs: 0 Number of syncs: 0
SyncTimes(ms): 0 0
2010-05-21 01:02:37,565 INFO org.apache.hadoop.ipc.Server: Stopping
server on 9000
2010-05-21 01:02:37,566 ERROR
org.apache.hadoop.hdfs.server.namenode.NameNode:
java.net.BindException:
 Cannot assign requested address
        at sun.nio.ch.Net.bind(Native Method)
        at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:119)
        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:59)
        at org.mortbay.jetty.nio.SelectChannelConnector.open(SelectChannelConnector.java:216)
        at org.apache.hadoop.http.HttpServer.start(HttpServer.java:424)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:246)
--
Best Regards

Jeff Zhang