[Pgpool-general] pgpool-II 2.0 released

[Yoshiyuki Asaba]

November 16, 2007

The pgpool Global Development Group is pleased to announce the release
of pgpool-II 2.0 beta1, a new version of open source middle ware to
enhance the reliability and performance of PostgreSQL.

* pgpool-II 2.0
http://pgfoundry.org/frs/download.php/1515/pgpool-II-2.0.tar.gz

pgpool-II 2.0 has lots of new features and bug fixes. Enjoy!

2.0 (hikitsuboshi) 2007/11/16
      * Version 2.0

      * Incompatibility since pgpool-II 1.x
        - the default value for ignore_leading_white_space is now
          true(Yoshiyuki) 
 	- replicate_strict is removed. The value is always
          true(Yoshiyuki)

      * General
        - Allow to reload pgpool.conf(Yoshiyuki)
        - The paraser is now compatible with PostgreSQL 8.3(Yoshiyuki)
        - Add new directive "failover_command" to specify command when
          a node is detached(Yoshiyuki)
        - Add new directive "client_idle_limit" to specify the time out since
          the last command is arrived from a client(Tatsuo)
  
      * Replication
        - Always start a new transaction even if the query is not in
          an explicit transaction to enhance the reliabilty of
          replication(Yoshiyuki)
        - Enhance the performance of replication for write
          queries. Now the worst case is 1/2 compared with single DB
          node regardless the number of DB nodes. Previous release
          tends to degrade according to the numer of DB
          nodes(Yoshiyuki)
        - Add "online recovery" which allows to add a DB node and sync
          with other DB nodes without stopping the pgpool
          server(Yoshiyuki)
        - Abort a transaction if INSERT, UPDATE and DELETE reports
          different number of result rows(Yoshiyuki)

          x=# update t set a = a + 1;
          ERROR:  pgpool detected difference of the number of update tuples
          HINT:  check data consistency between master and other db node

        - If the results from DB nodes do not match, select the
          possible correct result by "decide by majority". Previous
          release always trust the result of the master DB
          node(Yoshiyuki)
        - Allow load balance in V2 frontend/backend protocol(Yoshiyuki)

      * Parallel query
        - Allow "partial replication" to enhance the performance of
          the parallel query(Yoshiharu)

--
Yoshiyuki Asaba
y-asaba at sraoss.co.jp