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From Andrew Purtell <apurt...@apache.org>
Subject Re: [ANN] HBase 0.20.0-alpha available for download
Date Wed, 17 Jun 2009 08:44:10 GMT
Minor correction/addition: "Stargate" is undergoing shared development in two github trees:
The github network view can show which branch is leading at any point in time:

   - Andy

From: stack <stack@duboce.net>
To: hbase-user@hadoop.apache.org; core-user@hadoop.apache.org
Sent: Tuesday, June 16, 2009 10:23:20 PM
Subject: [ANN] HBase 0.20.0-alpha available for download

An alpha version of HBase 0.20.0 is available for download at:


We are making this release available to preview what is coming in HBase
0.20.0.  In short, 0.20.0 is about performance and high-availability.  Also,
a new, richer API has been added and the old deprecated.  Here is a list of
almost 300 issues addressed so far in 0.20.0: http://tinyurl.com/ntvheo

This alpha release contains known bugs.  See http://tinyurl.com/kvfsft for
the current list.  In particular, this alpha release is without a migration
script to bring your 0.19.x era data forward to work on hbase 0.20.0.  A
working, well-tested migration script will be in place before we cut the
first HBase 0.20.0 release candidate some time in the next week or so.

After download, please take the time to review the 0.20.0 'Getting Started'
also available here:
HBase 0.20.0 has new dependencies, in particular it now depends on
ZooKeeper.  With ZooKeeper in the mix a few core HBase configurations have
been removed and replaced with ZooKeeper configurations instead.

Also of note, HBase 0.20.0 will include "Stargate", an improved REST
connector for HBase.  The old, bundled REST connector will be deprecated.
Stargate is implemented using the Jersey framework.  It includes protobuf
encoding support, has caching proxy awareness, supports batching for
scanners and updates, and in general has the goal of enabling Web scale
storage systems (a la S3) backed by HBase.  Currently its only available up
on github, http://github.com/macdiesel/stargate/tree/master.  It will be
added to a new contrib directory before we cut a release candidate.

Please let us know if you have difficulty with the install, if you find the
documentation missing or, if you trip over bugs hbasing.

The HBasistas

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