2.1 (inamiboshi) 2008/4/??
      * Version 2.1

      * New feature
        - Add '%m' format to failover_command and failback_command to
          obtain new master node ID. (Yoshiyuki)
        - Add '%m' format to failover_command and failback_command to
          obtain old master node ID. (Yoshiyuki)
        - Add new directive "recovery_timeout" to specify recovery
          timeout in second. (Taiki)
        - Add optino '-v' to print pgpool version. (Yoshiyuki)

      * Incompatibility
        - Restrict pgpool_recovery() and pgpool_remote_start()
          functions to superusers. (Yoshiyuki)
        - Do not create a connection pool to standby node in raw
          mode. (Yoshiyuki)
        - Remove "replication_timeout" parameter. (Yoshiyuki)
          - This enabled if replication_strict was false. However,
            replication_strict was already removed.
        - Ignore timeout argument of pcp commands. (Taiki)
        - Do not replicate "COPY TO STDOUT" when replicate_select is
          false. (Yoshiyuki)

      * Bug fix
      ** General
        - Fix crash when CloseComplete message was
          received. (Yoshiyuki)
        - Improve network I/O routine. (Yoshiyuki)
        - Fix compile errors on Solaris 10. (Yoshiyuki)
        - Improve log messages of health check and recovery. (Tatsuo)
        - Change error level of the "failed to read kind from
          frontend" message from ERROR to LOG. (Yoshiyuki)
        - Fix failover failure in raw mode. (Taiki)
        - Fix zombie process bug. (Yoshiyuki)
        - Fix health_check_timeout to work correctly. (Kenichi Sawada)
        - Support ps status on FreeBSD. (ISHIDA Akio)
        - Improve bind(2) failure report. (Jun Kuriyama)
        - Improve error message when client authentication
          failed. (Tatsuo)

      ** Replication
        - Fix replicate_select to work correctly. (Tatsuo)
        - Fix a wrong rollback bug with extended query. (Yoshiyuki)
        - Fix a bug with asynchronous query. (Yoshiyuki)
        - Fix hint clause handling like /*REPLICATION*/ with extended
          query. (Yoshiyuki)
        - Fix crash of "DEALLOCATE ALL". (Yoshiyuki)
        - Fix hang up when a backend node does immediate
          shutdown. (Yoshiyuki)
        - Fix hang up online recovery in high load. (Yoshiyuki)
        - Fix hang up with extended query protocol when SELECT is
          failed inside a transaction block. (Yoshiyuki)

      ** Master Slave
        - Fix load balancing to work correctly. (Yoshiyuki)
        - Fix crash if SET, PREPARE or DEALLOCATE is executed inside a
          transaction block. (Yoshiyuki)

      ** Parallel query
        - Fix INSERT failure. (Yoshiharu)
        - Fix syntax error when a query contains "AS" in FROM
          clause. (sho)
        - Fix Hung up when two or more statment was executed 
          in parallel mode (Yoshiharu)
        - Fix Query rewriting of Join Expression and DISTINCT ON
          (Yoshiharu)

2.0.1 (hikitsuboshi) 2007/11/21
      * Version 2.0.1
      * Fix process down with UPDATE or DELETE query.(Yoshiyuki)
      * Send a syntax query only to a master node if master_slave is
        true.(Yoshiyuki)

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)

1.3 (sohiboshi) 2007/10/23
      * Version 1.3
      * Add new "authentication_timeout" directive, being the default
        value is 60. (Yoshiyuki)
        - Maximum time in seconds to complete client authentication.
      * Reject a connection when startup packet length is greater than
        10,000 byte. (Yoshiyuki)
      * Fix invalid memory access when pgpool processed DEALLOCATE
        statement. (Yoshiyuki)
      * Fix hang up in load balance mode. (Yoshiyuki)
        - This was introduced in V1.2.
      * Fix segmentation fault in 64-bit environment when query cache
        is enable. (Yoshiyuki)

1.2.1 (tomoboshi) 2007/09/28
      * Version 1.2.1
      * Fix deadlock while processing Parse message. (Yoshiyuki)
      * Fix memory leak in reset_prepared_list(). (Yoshiyuki)
      * Fix compile error on FreeBSD 4.11. (Yoshiyuki)
      * SET, PREPARE and DEALLOCATE statements are replicated in
        master/slave mode. (Yoshiyuki)

1.2 (tomoboshi) 2007/08/01
      * Version 1.2
      * Add new "replicate_select" directive, being the default value
        is false. (Yoshiyuki) 
        - If it is true, SELECT query is replicated. This behavior is
          same as V3.2 or earlier.
      * Improve signal handling. (Yoshiyuki)
        - Occasionaly, zombie processes were remained. Or processes
          were unstable.
      * Fix hang up when SELECT was error inside a transaction
        block. The bug was introduced in V3.3. (Yoshiyuki)
      * Fix PREPARE/EXECUTE handling in master slave mode. (Yoshiyuki)
      * Fix "kind mismatch error" when deadlock error 
      * Fix hang up and SEGV in extended query protocol when a warning
        SQL like "SELECT '\'';" executed. (Yoshiyuki)
      * Fix hang up when postmaster did fast or immediate
        shutdown. (Yoshiyuki)
      * Fix memory leak when connection cache was full. (Yoshiyuki)
      * Load balancing node is selected when a session
        starts. (Yoshiyuki)
      * Fix buffer overrun if connection_life_time was
        set. (Yoshiyuki)

1.1.1 (amiboshi) 2007/6/15
      * Version 1.1.1
      * Fix "kind mismatch" bug when load_balance_mode is true
        introduced in 1.1 (Yoshiyuki)
      * Fix deadlock with extended query protocol(Yoshiyuki)
      * Fix numerous bugs with protocol V2(Yoshiyuki)

1.1 (amiboshi) 2007/5/25
      * Version 1.1
      * Support HBA authentication(Taiki)
      * Support log_connections(Taiki)
      * Support log_hostname(Taiki)
      * Show pgpool status in ps command(Taiki)
      * Fix compile error on MacOS X(Yoshiyuki)
      * Allow load balancing with extended protocol(Yoshiyuki)
      * Improve replication. SELECT nextval() and SELECT setval() are
        now replicated. (Yoshiyuki)
      * Change SELECT query is only sent to the master node. (Yoshiyuki)
        - Use /*REPLICATION*/ comment to repliate a SELECT query.
      * Fix unexpected failover error due to receiving an interrupt
        signal while connecting to the backend. (Yoshiyuki)
      * Add "pgpool.pam" file, for PAM configuration file, to be
        installed under "$PREFIX/share/pgpool-II/". (Taiki)
      * Fix core dump when executing large SQL. (Yoshiyuki)

1.0.2 (suboshi) 2007/02/12
      * Version 1.0.2
      * Fix bug when executing large SQL to prevent pgpool goes into
        infinite loop(Yoshiyuki)
      * Fix bug with extended protocol handling(Yoshiyuki)
      * Enhance log for failover and failback(Tatsuo)
      * Add backend status info to show pool_status(Tatsuo)
      * Fix UPDATE/DELETE returns wrong number of rows(Tatsuo)
      * Fix configure fails to link libpq when used with older
        version of gcc(Yoshiyuki)
      * Fix DEALLOCATE treatment when used with PHP:PDO DBD-Pg(Yoshiyuki)
      * Do not load balance SELECT FOR UPDATE, SELECT INTO and SELECT
        with comments. This behavior is compatible with
        pgpool-I(Yoshiyuki)
      * Obtain path to libpq using pg_config. --with-pgsql will be
        removed in next version(Yoshiyuki) 
      * When reusing connection pool, reconnect to backend if the
        socket is broken(Yoshiyuki)
      * Fix error with configure when used with PostgreSQL
        7.4(Yoshiyuki)

1.0.1 (suboshi) 2006/09/22
      * Version 1.0.1
      * This version fixes bugs including master/slave not being
        working, deadlock problem in COPY FROM STDIN. Also documents
        are improved.

1.0.0 (suboshi) 2006/09/08
      * Initial release

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