Hi Michael,
Very interesting, but the docs states that it is "transparent" only for
libpq clients. This means Java clients (using the type 4 JDBC driver)
can't use PostgreSQL XC?
Also, as far as I understand the docs, I need something external do
implement failover if I connect to a database server which comes offline
(JBoss AS HA Datasources comes to mind), and there's no balancer
included. Am I right?
[]s, Fernando Lozano
Hi all,
Postgres-XC, read&write-scalable multi-master symmetric cluster based
on PostgreSQL, version 1.0.0 is released.
This project is seen as an open-source alternative to costly products
such as OracleRAC. Postgres-XC is based on the code of PostgreSQL, so
it can naturally use all its technologies, which are enhaunced to have
a shared-nothing multi-master PostgreSQL-based database cluster.
This first stable version is based on PostgreSQL 9.1.4. All the
patches in PostgreSQL 9.1 stable branch have been merged up to commit
873d1c1 (1st of June 2012).
This includes the security fix related to pg_crypto dated of 30th of May.
You can download the source tarball directly from here:
https://sourceforge.net/projects/postgres-xc/files/latest/download
This tarball contains all the HTML and man documentation.
30 bug fixes have been made since release of beta2, with some notable
enhancements:
- Support for EXTENSION is fixed
- Stabilization of the use of slave nodes in cluster
- Fix of a bug related to read-only transactions, improving
performance by 15%.
- Support of compilation for MacOSX
About the scalability of this release, Postgres-XC 1.0.0 scales to a
factor of 3 when compared to a standalone server PostgreSQL 9.1.3 on 5
nodes using a benchmark called DBT-1.
Compared to version Postgres-XC 0.9.7, the following features have
been added:
- Fast query shipping (FQS), quick identification of expressions in a
query that can be pushed down to remote nodes
- SERIAL types
- TABLESPACE
- Utility to clean up 2PC transactions in cluster (pgxc_clean)
- Utility for initialization of GTM (global transaction manager,
utility called initgtm)
- Relation-size functions and locking functions
- Regression stabilization
The documentation of 1.0, including release notes, is available here:
http://postgres-xc.sourceforge.net/docs/1_0/.
The project can be followed on Source Forge:
http://postgres-xc.sourceforge.net/.
And a couple of GIT repositories are used for development:
- SourceForge:
http://postgres-xc.git.sourceforge.net/git/gitweb.cgi?p=postgres-xc/postgres-xc;a=summary
- Github: https://github.com/postgres-xc/postgres-xc
The core team is currently working in the addition of new features for
the next major release including:
- Merge with PostgreSQL 9.2
- Data redistribution functionality, changing table distribution in
cluster with a simple ALTER TABLE
- New functionalities related to online node addition and deletion for
a better user experience
- Triggers
- Planner improvements
- Global constraints.
The roadmap of the project is located here =>
http://postgres-xc.sourceforge.net/ in section Roadmap.
The project is under the same license as PostgreSQL, now managed under
a single entity called "Postgres-XC Development Group".
In order to keep in touch with the project, whose development follows
the same model as PostgreSQL, you can register to the following
mailing lists:
- [email protected]
<mailto:[email protected]>, for general
questions. Registration can be done here:
https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
- [email protected]
<mailto:[email protected]>. hachers mailing
list. Registration can be done here:
https://lists.sourceforge.net/lists/listinfo/postgres-xc-developers
See you soon on the project mailing list, and have fun with this
stable release.
--
Michael Paquier
Member of core team of Postgres-XC, and Postgres-XC Development Group
