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From Piotr Praczyk <piotr.prac...@gmail.com>
Subject Re: Suspend or scale back hadoop instance
Date Tue, 19 May 2009 13:41:45 GMT
Hi John

I don't know if there is a Hadoop support for such thing, but You can do
this easily writing a crontab  script. It could start hadoop at specified
hour and shut it down ( disable some nodes) at another one.

There can be some problems with HDFS however ( if you disable all the nodes
holding replicas of some blocks, the files will become inaccessible)


2009/5/19 John Clarke <clarkemjj@gmail.com>

> Hi,
> I am working on a project that is suited to Hadoop and so want to create a
> small cluster (only 5 machines!) on our servers. The servers are however
> used during the day and (mostly) idle at night.
> So, I want Hadoop to run at full throttle at night and either scale back or
> suspend itself during certain times.
> Is it possible to do this? I've found very little information on it.
> Thanks for your help!
> John

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