Pgpool Global Development Group is pleased to announce the
availability of pgpool-II 3.0. In the mean time new version of
pgpoolAdmin, the GUI tool for pgpool-II, pgpoolAdmin 3.0 is

pgpool-II 3.0/pgpoolAdmin 3.0 can be downloaded here:

Pgpool-II 3.0 is an important version in its history. The internal
structure has been dramatically enhanced to make it more robust and
easier to maintain. Also this version adopts to PostgreSQL 9.0's
built-in replication. Many enhancements are added also. So users of
PostgreSQL 8.4 or prior versions should be able to enjoy pgpool-II
3.0's enhancements as well.

Pgpool-II 3.0 has been tested with PostgreSQL 9.0 RC1 and prior
versions of PostgreSQL including 7.3.

Users of prior versions of pgpool-II should be able to upgrade to
pgpool-II 3.0 without much pain. Especially pgpool-II 2.3.x users
should be able to migrate to 3.0 without changing pgpool.conf(it is
recommneded to use new pgpool.conf, though).

However be warned that output format of some of pcp command are
changed. Please look into the documents. Also you should use
pgpoolAdmin 3.0 with pgpool-II 3.0. Prior versions of pgpoolAdmin is
not compatible with pgpool-II 3.0.

Attached are release note of pgpool-II 3.0 and pgpoolAdmin 3.0.

3.0(umiyameboshi) 2010/09/10

* Version 3.0

This is the first version of pgpool-II 3.0 series.
That is, a "major version up" from 2.2 or 2.3 series.

The biggest news is, this version adapts to PostgreSQL 9.0's new
feature: Streaming Replication/Hot Standby. Streaming
replication can be used as a sub mode of master slave
mode. Master slave mode itself heavily enhanced:

- SELECTs in explicit transactions can be load balanced

- In extended protocol, PARSE/BIND/DESCRIBE messages are sent to
the node which execute EXECUTE message, not all node. This
will reduce lock contentions.

- Auto start of transaction happens only when it needed.

- Temporary tables can be used safely.

- SELECT which calls functions possibly write to database
executes on master(primary)

Also many new features are added and major refactoring has been
made to the internal structure of pgpoo-II. For example, in
replication mode, SELECTs calling functions possibly write to
database will not allow to load balance.

* New features

- Online recovery can be used with master/slave/streaming
replication mode(Tatsuo)

- New directive "delay_threshold" is added to monitor
replication delay in master/slave/streaming replication
mode. If replication delay is too much, SELECTs are not load

- show pool_status shows replication delay in
master/slave/streaming replication mode(Tatsuo)

- New directive "log_standby_delay" is added to control logging of
replication delay in master/slave/streaming replication

- When insert_lock is enabled and the table includes SERIAL data
type, issue row lock on the sequence table. Before we issues
table lock. Problem is, the table lock conflicts with auto
vacuum and sometimes caused excessive lock waiting(Tatsuo)

- Add support for more "SHOW" commands: pool_nodes,
pool_processes, pool_pools, and pool_version(Guillaume Lelarge)

- Backend process id and whether frontend connects to this
connection pool or not are added to pcp_proc_info's

- "Gracefuly detach" option is added to pcp_detatch_node. With
this option, pcp_detatch_node waits until all frontends

- New directive "white_function_list" and "black_function_list"
are added to register functions those do not or do write to

- In master/slave mode, SELECTs to system catalogs executes only
on master/primary(Tatsuo)

- In master/slave mode, SELECTs to temporary table executes only
on master/primary(Tatsuo)

- In master/slave mode, write queries outside of explicit
transactions no longer trigger to start internal

- In master/slave mode, SELECTs inside explicit transactions are
load balanced(Tatsuo, Kitagawa)

- In master/slave mode, commands are no longer sent to all DB
nodes. This will prevent unnecessary locking(Tatsuo, Kitagawa)

- New command option adds to ignore the status file when
starting up(Tatsuo)

- Supports PostgreSQL 9.0's new VACUUM syntax(Tatsuo)

- New directive "failover_if_affected_tuples_mismatch" controls
the behavior when number of result rows of
INSERT/UPDATE/DELETE are differ(Tatsuo)

- When number of result rows of INSERT/UPDATE/DELETE are
differ, each number are logged(Tatsuo)

- md5 authentication is supported in replication mode and
master/slave mode(Tatsuo)

- Allow to force to move to online recovery second stage even
there are connecting frontends(Tatsuo)

- If there's only one DB node and it triggers failover,
pgpool-II will automatically connects if the DB node coming

- Pcp commands supports long options(Guillaume Lelarge)

- New directive "debug_level" added to control the debug message

- Allow to use various boolean representations as PostgreSQL in

- New C language function pgpool_switch_xlog for online recovery

- New C language function pgpool_regclass added to avoid a trouble
about handling of duplicate table names in different schema(Tatsuo)

* Bug fixes

- Do not rewrite statement which accesses columns having now()
etc. as the default value but the data type are not timestamp
etc. Otherwise we have an error in DMLs(Tatsuo)

- Fix timestamp rewriting not to omit schema qualification(Tatsuo)

- Fix bug with timeout handling in pcp commands(Tatsuo)

- Fix SSL hang when large amount of data transfered(Tatsuo)

- Fix failover when there's only one DB node(Tatsuo)

- Fix bug with postmaster start check in online recovery.
Before it continued infinitely to try to connect to postmaster
if the first attempt failed(Tatsuo)

pgpoolAdmon 3.0 2010/09/10

* Version 3.0

pgpoolAdmin 3.0 adopts pgpool-II 3.0.

- Add "Discard pgpool_status file(-D)" to pgpoolAdmin Setting(Anzai)

- Sync pgpool.conf Setting with pgpool-II 3.0(Anzai, Tatsuo)

- Add "Backend pid" (process if of PostgreSQL database
server process) and "Frontend connected"(1 if frontend
actually connets) to Process Info.(Tatsuo)

- Replace functions deprecated in PHP 5.3(Anzai)

- Refactor pgpool status/summary(Tatsuo)

- Fix connect/disconnect buttons disappering ini node status

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