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From Andrew Purtell <apurt...@apache.org>
Subject Re: no memory tables
Date Fri, 27 Mar 2009 09:13:37 GMT

Regrettably I no longer control that 25 node cluster, a
consequence of a promotion. Call me a victim of my own 
success with it. But actually I am up on AWS right now
finishing up a 64-bit AMI and EBS snapshot I can use to stand
up HBase test clusters on demand. 

I'll be reinitializing at every experiment start anyhow, so
hfile format changes won't be a problem at all.

   - Andy

> From: Ryan Rawson
> Subject: Re: no memory tables
> To: hbase-user@hadoop.apache.org, apurtell@apache.org
> Date: Friday, March 27, 2009, 1:28 AM
> Trunk is workable right now - but ymmv and there is no, and
> I repeat, NO guarantee the file format won't change at a
> moment's notice.  I mean it - you could svn up and your
> installation will be trashed, with no way to
> recover it except rm -rf /hbase.
> In fact, let me stress again - there is an outstanding
> patch that will infact change the basic storage format (key
> format in hfile to be specific).
> If you are willing to toss test data in a throw-away
> instance, give it a spin.  Watch as your 25 node cluster
> sustains 200-300k ops/sec for hours on end (turn compression
> on to 'gz').  Be amazed as scanners return 0 rows in
> 0ms from the client's point of view.  And so on.


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