The basic steps are the same, but to go from 0.20 to 0.90 there is no actual "migrate" step. On the HBase side, all that is required is shutting down the old version and coming back up with the new version. You need to handle the Hadoop upgrade as well as laid out on that wiki page.
You may want to backup your hbase directory on HDFS to be safe. Once you upgrade to 0.90 there is no easy way to go back unless you have a backup.
> -----Original Message-----
> From: mike anderson [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, January 20, 2011 11:01 AM
> To: [EMAIL PROTECTED]
> Subject: Re: stargate 20.6 with hbase 20.2
> I couldn't find any specific migration instructions for 0.90.0 other than
> Is this the case?
> On Thu, Jan 20, 2011 at 1:27 PM, mike anderson
> <[EMAIL PROTECTED]>wrote:
> > Thanks, decided to bite the bullet and just update to 0.90.0.
> > Cheers,
> > Mike
> > On Thu, Jan 20, 2011 at 1:07 PM, Jonathan Gray <[EMAIL PROTECTED]> wrote:
> >> It's strongly recommended that you upgrade to HBase 0.20.6 (at least)
> >> if not HBase 0.90.0. There are several critical bug fixes in the
> >> releases between 0.20.2 and 0.20.6 besides stargate.
> >> > -----Original Message-----
> >> > From: mike anderson [mailto:[EMAIL PROTECTED]]
> >> > Sent: Thursday, January 20, 2011 9:57 AM
> >> > To: [EMAIL PROTECTED]
> >> > Subject: stargate 20.6 with hbase 20.2
> >> >
> >> > Does it seem reasonable that I could get Stargate 20.6 to work with
> >> Hbase
> >> > 20.2? I need some of the improvements made in 20.6, but would
> >> > rather not have to upgrade my entire cluster if I don't have to.
> >> >
> >> > -mike