The HBase team is happy to announce the immediate availability of Apache
HBase 2.0.0.

Apache HBase™ is the Hadoop database, a distributed, scalable, big data store.
To learn more about HBase, see

HBase 2.0.0 is our second major release, the first release off the HBase 2.0 line.

Please review 'Upgrading from 1.x to 2.x' in the bundled HBase 2.0.0 Reference
Guide before installing or upgrading for a list of notable incompatibilities, major
changes, and features including a new Region assignment manager ("AMv2"),
a means for configuring the read and/or write path to run off-heap, and an
optional In-Memory Compaction ("IMC", A.K.A "Accordion") facility.

According to our adopted Semantic Versioning guidelines[2], we allowed
ourselves make breaking changes in this major version release. For
example, Coprocessors will need to be recast to fit more constrained APIs and
rolling upgrade of an hbase-1.x install to hbase-2.x without downtime is (currently)
not possible. That said, a bunch of effort has been expended mitigating the
differences; a hbase-1.x client can perform DML against an hbase-2 cluster. A
bundled compatibility report showing difference from 1.2.6 may be of help [3].

For the complete list of fixes and improvements, see the included
`` (or online at [1]) and ``.

Download through an ASF mirror near you:

The relevant checksums files are available at:

Project member signature keys can be found at

PGP signatures are available at:

For instructions on verifying ASF release downloads, please see

Question, comments, and problems are always welcome at:

Thanks to all who contributed and made this release possible.

The HBase Dev Team