This is to announce a first prototype of database replication for the
open source HSQLDB database (HSQLDB/R).

Documentation is available at:
http://www.javagroups.com/javagroupsnew/docs/hsqldbr.html

The prototype can be downloaded from either

http://sourceforge.net/project/showfiles.php?group_id=23316&release_id=108957

or

http://www.javagroups.com/javagroupsnew/docs/hsqldbr.html


 
The functionality of HSQLDB/R includes:

- Multiple replicas in a replication cluster (a replica is an HSQLDB
  database server). Replicas find each other via JavaGroups, no
  configuration is needed (in almost all cases)
- Updates to one replica are propagated to all other replicas in the
  same cluster
- New replicas will fetch the entire database contents (e.g.schema,
  users, contents) from an existing replica. Initial replicas will
  initialize themselves from file (if exists).
- Can be used for failover from a primary to a backup (hot-standby)
  database server


Future functionality will include:

- Replication support will be an optional part of HSQLDB.
  Replication-related classes are only loaded when needed.
- Transfer of large DBs
- Binary format for replication (more efficient)
- Group-aware JDBC driver: client's JDBC driver will automatically use
  only available database servers. If a server fails, client will
  transparently choose another server. Policy of choosing a server
  will be user-defined.
- Conflict prevention and resolution when updating the same data in
  different replicas.


Disclaimer: this is a prototype to experiment with replication in
HSQLDB and should by no means be used for mission-critical data !


Questions and comments about HSQLDB/R can be posted to

http://lists.sourceforge.net/lists/listinfo/hsqldb-developers

or on the HSQLDB Open Discussion Forum (for those who don't want to
subscribe to a list):

https://sourceforge.net/forum/forum.php?forum_id=73673



Bela Ban, JavaGroups (www.javagroups.com)
Fred Toussi, HSQLDB (www.hsqldb.org)

San Jose/London, Sept 5 2002




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