TODO

$Header: /cvsroot/pgpool/pgpool-II/TODO,v 1.19 2009/11/05 03:43:27 t-ishii Exp $

* General

- Add backend id to statement log

- Show PostgreSQL backend process ids in process status

- Prepare for changing postgresql.conf directives which produce 'S'
  message. Othewise we get:

  pool_process_query: 1 th kind S does not match with master or majority
  connection kind C

  ERROR: pid 26122: kind mismatch
  among backends. Possible last query was: "UPDATE branches SET bbalance
  = bbalance + -3820 WHERE bid = 1;" kind details are: 0[C] 1[S]

  It seems PostgreSQL sends following parameter status at the *first* pgpool.conf reload only.

2009-02-23 23:06:21 LOG:   pid 5611: name: is_superuser value: on
2009-02-23 23:06:31 LOG:   pid 5627: name: DateStyle value: ISO, MDY
2009-02-23 23:06:31 LOG:   pid 5626: name: DateStyle value: ISO, MDY
2009-02-23 23:06:31 LOG:   pid 5622: name: DateStyle value: ISO, MDY

  (this item was resolved in 2.2)

- drop table should be in a transactin block? It is judged here:
  (this item was resolved in 2.2)

POOL_STATUS start_internal_transaction(POOL_CONNECTION_POOL *backend, Node *node)
{
	int i;

	/* if we are not in a transaction block,
	 * start a new transaction
	 */
	if (TSTATE(backend) == 'I' &&
		(IsA(node, InsertStmt) || IsA(node, UpdateStmt) ||
		 IsA(node, DeleteStmt) || IsA(node, SelectStmt)))

  example session log:

2009-01-09 00:22:20 JST t-ishii test 853 LOG:  statement: begin;
2009-01-09 00:22:23 JST t-ishii test 853 LOG:  statement: lock table t1;
2009-01-09 00:22:23 JST t-ishii test 853 LOG:  unexpected EOF on client connection
2009-01-09 00:22:45 JST t-ishii test 860 LOG:  statement: drop table t1;
2009-01-09 00:22:46 JST t-ishii test 860 LOG:  unexpected EOF on client connection
2009-01-09 00:22:49 JST t-ishii test 877 LOG:  statement: drop table t1;
2009-01-09 00:22:49 JST t-ishii test 877 ERROR:  table "t1" does not exist
2009-01-09 00:22:49 JST t-ishii test 877 STATEMENT:  drop table t1;


?????????
2009-01-09 00:22:23 JST t-ishii test 854 LOG:  unexpected EOF on client connection
2009-01-09 00:22:46 JST t-ishii test 861 LOG:  statement: drop table t1;
2009-01-09 00:22:46 JST t-ishii test 861 ERROR:  cache lookup failed for constraint 1857934
2009-01-09 00:22:46 JST t-ishii test 861 STATEMENT:  drop table t1;
2009-01-09 00:22:46 JST t-ishii test 861 LOG:  could not send data to client: ???????????
2009-01-09 00:22:46 JST t-ishii test 861 LOG:  unexpected EOF on client connection
2009-01-09 00:22:49 JST t-ishii test 878 LOG:  statement: drop table t1;
2009-01-09 00:22:49 JST t-ishii test 878 ERROR:  cache lookup failed for constraint 1857934
2009-01-09 00:22:49 JST t-ishii test 878 STATEMENT:  drop table t1;
2009-01-09 00:25:51 JST t-ishii test 878 LOG:  statement: create table t1(i int);
2009-01-09 00:25:52 JST t-ishii test 878 ERROR:  relation "t1" already exists
2009-01-09 00:25:52 JST t-ishii test 878 STATEMENT:  create table t1(i int);
2009-01-09 00:25:52 JST t-ishii test 878 LOG:  could not send data to client: ???????????
2009-01-09 00:25:52 JST t-ishii test 878 LOG:  unexpected EOF on client connection

- BEGIN; BEGIN; causes:
  (this item was resolved in 2.2)

  ERROR:  kind mismatch among backends 0[N] 1[E]

  detect_error() checks following  NOTICE(ERRRO¤Î25001 means /* SET
  TRANSACTION ISOLATION LEVEL must be called before any query */)

  WARNING:  25001: there is already a transaction in progress

  this will send an error query to abort a transaction.

- regression failres:

     triggers             ... FAILED
test sanity_check         ... FAILED
     portals              ... FAILED
test misc                 ... FAILED
     plpgsql              ... FAILED
     largeobject          ... FAILED
test tablespace           ... FAILED

========================
 7 of 114 tests failed. 
========================

  this happens when replication true, insert_lock true, replicate_select false,
  load_balance false.

  if replicate_select is true, prepared_xacts fails(because \d fails)
  and prepared transactio remain, which keep a lock on pg_class in
  access share mode. And alter table pg_class cannot obtain exclusive
  lock, which causes all SELECTs suspend and regression cannot contiunue.

- Allow client encoding conversion. This was possible in pgpool-I

- Allow special comment such as "/* STRICT */". This was possible in pgpool-I

- Allow multi statement

- Sometimes query is sent to a DB node despite its weight is 0

- Avoid cross pgpool process deadlock situation. This is a long
  standing problem since pgpool-II was born (pgpool-I avoids this by
  setting timeout)

- Allow to stop PostgeSQL from pgpoolAdmin to make the on-line
  recovery more convenient. This requires something like
  pgpool_remote_stop to be specified in pgpool.conf.

- If DISCARD ALL is specified in the reset_query_list and transaction
  is not closed when client disconnects, automatically issue ABORT
  before issuing DISCARD ALL

- Add SSL support

- Allow to specify queries issued when starting sessions

- Audit functionality?

- Make accept queue

- Graceful shutdown, attach, detach

* Query handling

- Enhance DROP DATABASE handling (not disconnect all idle connections)

* Replication

- Allow per table replication

- Allow per session level and query level load balancing

- Allow replication of SEQUENCE

- Allow replication of OID

- Allow to specify functions to be replicated other than nextval(), setval()

* On line recovery

- Allow recovery_1st_stage_command to get PostgreSQL listen port,
  database cluster directory etc. info

* Query cache

- Cache invalidation

* Parallel query

- Performance enhance for more complex queries

- Allow to handle transaction

- Allow to handle extended queries

- process alias in FROM clause

db=# select * from data1 as d1 inner join data2 as d2 on d1.id=d2.id;
ERROR:  sql error
DETAIL:  ERROR:  missing FROM-clause entry for table "d1"
LINE 1: SELECT pool_parallel("SELECT d1.id, d1.aaaa, d1.bbbb...
               ^
2008-03-11 10:28:17 LOG:   pid 6186: statement: SELECT pool_parallel("SELECT d1.id, d1.aaaa, d1.bbbb, a.cccc FROM data1")

- process USING clause in JOIN

* Docs

- Write libpcp API docs