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From Mark Kerzner <mark.kerz...@shmsoft.com>
Subject Re: Using a hard drive instead of
Date Wed, 17 Oct 2012 22:44:05 GMT

swap space would give me very high memory, up to 1 TB, say, but it won't
protect me from power failure. Very large clusters is only one application
of this idea, warm failover is another. The drive is not theoretical, just
look at the price tag :)


On Wed, Oct 17, 2012 at 5:37 PM, Colin Patrick McCabe

> The direct answer to your question us to use this theoretical super-fast
> hard drive as Linux swap space.
> The better answer is to use federation or another solution if your needs
> exceed those servable by a single NameNode.
> Cheers.
> Colin
> On Oct 11, 2012 9:00 PM, "Mark Kerzner" <mark.kerzner@shmsoft.com> wrote:
>> Hi,
>> Imagine I have a very fast hard drive that I want to use for the
>> NameNode. That is, I want the NameNode to store its blocks information on
>> this hard drive instead of in memory.
>> Why would I do it? Scalability (no federation needed), many files are not
>> a problem, and warm fail-over is automatic. What would I need to change in
>> the NameNode to tell it to use the hard drive?
>> Thank you,
>> Mark

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