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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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Re: Is it possible to recover name node just using the meta data in a new machine
Jeff Zhang 2010-05-21, 04:50
Hi Todd,

I try the command, but no process is using the port 50070

On Fri, May 21, 2010 at 12:39 PM, Todd Lipcon <[EMAIL PROTECTED]> wrote:
> The new machine apparently has something listening on one of the NN ports.
> try sudo fuser -n tcp 50070
> (will tell you which pid is listening on that port)
> -Todd
>
> On Thu, May 20, 2010 at 9:35 PM, Jeff Zhang <[EMAIL PROTECTED]> wrote:
>>
>> 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
>
>
>
> --
> Todd Lipcon
> Software Engineer, Cloudera
>

--
Best Regards

Jeff Zhang