atom feed1 message in org.apache.hadoop.hbase-userANN: HBase 0.90.0 available for download
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StackJan 19, 2011 2:00 pm 
Subject:ANN: HBase 0.90.0 available for download
From:Stack (
Date:Jan 19, 2011 2:00:29 pm

The HBase crew are pleased to announce the availability of 0.90.0.

You can download it here:

HBase 0.90.0 is the major HBase release to follow HBase-0.20.x and the fruit of the 0.89.x development release series we've been running over the last few months.

Over 1k issues have been closed since 0.20.0. Release notes are available here: Highlights include new master, inter-cluster replication, data durability, improved performance, improved i/o profile, etc.

We recommend all upgrade to this release but ONLY after a close reading of requirements [1]. In particular, see the section on Hadoop where we talk about the Hadoop versions and HBase 0.90.0.

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 (easy) 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.

A big thanks goes out to all who contributed to this release.

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, [2].

1. 2.