> Date: Mon, 30 Aug 2010 10:49:50 +0800
> From: lgpub...@yahoo.com.cn
> Subject: cluster startup problem
> To: common-user@hadoop.apache.org
>
> Hi all,
> I am trying to configure and start a hadoop cluster on EC2. I got some
> problems
> here.
>
>
> 1. Can I share hadoop code and its configuration across nodes? Say I have a
> distributed file system running in the cluster and all the nodes could see
> the
> hadoop code and conf there. So all the nodes will use the same copy of code
> and
> conf to run. Is it possible?
Use rsync
> 2. if all the nodes could share hadoop and conf, does it mean I can launch
> hadoop (bin/start-dfs.sh, bin/start-mapred.sh) from any node (even slave
> node)?
>
Just have a try. You will get answer.
> 3. I think I specify and master and slave correctly. When I launch hadoop
> from
> master node, no tasktracker or datanode was launched on slave nodes. The log
> on
> slave nodes says:
>
> ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException:
> Incompatible namespaceIDs in /mnt/hadoop/dfs/data: namenode namespaceID =
> 1048149291; datanode namespaceID = 313740560
>
> what is the problem?
If HDFS data are useless, just delete HDFS data from datanodes one by one.
> Thanks,
> -Gang
>
>
>
>
