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From Eric Baldeschwieler <eri...@yahoo-inc.com>
Subject Re: Stopping datanode and namenode
Date Thu, 06 Jul 2006 02:56:36 GMT
what does one gain from running in tomcat?

Doesn't seem to be our standard methodology.

On Jul 5, 2006, at 7:09 PM, barry.kaplan@gmail.com wrote:

> I am using hadoop's DFS in tomcat and was curious how other people are
> getting the deployment loader to work in conjunction with hadoop.
> Essentially the problem I am having is:
> 1) tomcat started and war deployed and running
> 2) New war file dropped into webapps dir
> 3) tomcat unloads war file, thus shutting down everything...
> 4) tomcat unpacks and loads new war file
> 5) servlet not started due to hadoop errors
> The issue is there is no way to stop the namenode or datanode, thus
> when I unload my app the daemon threads from the first bootup are
> still running, causing any subsequent load to have errors because
> hadoop dfs's namenodes/datanodes are still up, with open sockets.
> I see the code has some calls to stop the namenode for unit testing,
> what about opening that up, or adding a calls to namenode and datanode
> to shut them down?
> Or am I missing something obvious :)
> -Barry

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