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From Ryan Rawson <ryano...@gmail.com>
Subject Re: ANN: The third hbase 0.90.0 release candidate is available for download
Date Fri, 24 Dec 2010 01:10:00 GMT
I am out of town, but this is truely the best release of HBase yet!  I
have run other versions of this and things are just excellent.

Please download and give it a spin!  Even if it's just on a small test
cluster, for a day, whatever!


On Thu, Dec 23, 2010 at 3:43 PM, Stack <stack@duboce.net> wrote:
> The third hbase 0.90.0 release candidate is available for download:
>  http://people.apache.org/~stack/hbase-0.90.0-candidate-2/
> HBase 0.90.0 is the major HBase release that follows 0.20.0 and the
> fruit of the 0.89.x development release series we've been running of
> late.
> Over 1k issues have been closed since 0.20.0.  Release notes are
> available here: http://su.pr/8LbgvK.
> HBase 0.90.0 runs on Hadoop 0.20.x.  It does not currently run on
> Hadoop 0.21.0 nor on Hadoop TRUNK.   HBase will lose data unless it is
> running on an Hadoop HDFS 0.20.x that has a durable sync. Currently
> only the branch-0.20-append branch [1] has this attribute (See
> CHANGES.txt [3] in branch-0.20-append to see the list of patches
> involved adding an append). No official releases have been made from
> this branch as yet so you will have to build your own Hadoop from the
> tip of this branch, OR install Cloudera's CDH3 [2] (Its currently in
> beta).  CDH3b2 or CDHb3 have the 0.20-append patches needed to add a
> durable sync. If using CDH, be sure to replace the hadoop jars that
> are bundled with HBase with those from your CDH distribution.
> There is no migration necessary.  Your data written with HBase 0.20.x
> (or with HBase 0.89.x) is readable by HBase 0.90.0.  A shutdown and
> restart after putting in place the new HBase should be all thats
> involved.  That said, once done, there is no going back to 0.20.x once
> the transition has been made.   HBase 0.90.0 and HBase 0.89.x write
> region names differently in the filesystem.  Rolling restart from
> 0.20.x or 0.89.x to 0.90.0RC1 will not work.
> Should we release this candidate as hbase 0.90.0?  Take it for a spin.
> Check out the doc., etc.  Vote +1/-1 by January 3rd, 2011.
> Yours,
> The HBasistas
> P.S. For why the version 0.90 and whats new in HBase 0.90, see slides
> 4-10 in this deck [4]
> 1. http://svn.apache.org/viewvc/hadoop/common/branches/branch-0.20-append
> 2. http://archive.cloudera.com/docs/
> 3. http://svn.apache.org/viewvc/hadoop/common/branches/branch-0.20-append/CHANGES.txt
> 4. http://hbaseblog.com/2010/07/04/hug11-hbase-0-90-preview-wrap-up/

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