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From Jeff Zhang <zjf...@gmail.com>
Subject Re: How can I get system environment variable in core-site.xml
Date Fri, 12 Mar 2010 02:05:31 GMT
Does your cluster share a same NFS ?

On Fri, Mar 12, 2010 at 12:28 AM, Lu welman <welmanwenzi@gmail.com> wrote:

> Dear Jeff,
>
> First, thank you very much for your selfless help!
> For these three computers, it just seems like they are sharing a same disk
> area. I don't know whether they will redundant copy data or other way.
> Any way, let me use an example to explain that.
> When I create any file, e.g., foo in one of these computers, A.
> Then from the other two nodes, B and C, I can see the same file foo.
>
> Below is the log in my system,
>
> The success one records like this,  you can see that this machine have
> format that directory,
>
> 2010-03-11 17:17:12,689 INFO org.apache.hadoop.hdfs.server.common.Storage: Storage directory
$HOME/data/dir is not formatted.
> 2010-03-11 17:17:12,689 INFO org.apache.hadoop.hdfs.server.common.Storage: Formatting
...
>
>
> The fail node then records like this, he can't use the same directory, because this directory
is locked.
> 2010-03-11 17:17:09,176 INFO org.apache.hadoop.hdfs.server.common.Storage: Cannot lock
storage $HOME/data/dir. The directory is already locked.
>
>
> 2010-03-11 17:17:09,288 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException:
Cannot lock storage $HOME/data/dir. The directory is already locked.
>
> May be these three directories are on independent disks, but from hadoop's
> point, it's a same directory, and only can be locked once.
> So that why I can't deploy Hadoop.
>
> Best Regards
> welman Lu
>



-- 
Best Regards

Jeff Zhang

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