[pgpool-general: 628] Re: exclude EXPLAIN from the pgpool.

Nicolas Amato nicolas.amato at autoxy.it
Wed Jun 13 20:35:17 JST 2012


No, a few Explain cause errors.
The trivial explain is ok. The complex explain causes this error :(
In fact, as I have seen,  even if the table has the same row/index, the
explain gives differen results. I will resolve this soon.
I want that the explain gets only done on the master node. Only one node.
Does  the configuration “replicate_explain = off” exist ???

Thanks for your answer.

Nicolas

2012/6/13 Tatsuo Ishii <ishii at postgresql.org>

> Even trivial explain like "EXPLAIN SELECT 1" causes errors?
> --
> Tatsuo Ishii
> SRA OSS, Inc. Japan
> English: http://www.sraoss.co.jp/index_en.php
> Japanese: http://www.sraoss.co.jp
>
> > Hi,
> > I would like to know if I can exclude the command EXPLAIN from the
> pgpool.
> > It generates a lot of errors:
> >
> > 2012-06-13 09:35:11 ERROR: pid 15204: read_kind_from_backend: 1 th kind C
> > does not match with master or majority connection kind D
> > 2012-06-13 09:35:11 ERROR: pid 15204: kind mismatch among backends.
> > Possible last query was: "EXPLAIN SELECT ...... " kind details are: 0[D]
> > 1[C]
> > 2012-06-13 09:35:11 LOG:   pid 15204: do_child: exits with status 1 due
> to
> > error
> >
> > pool-II-3.1.3
> > PostgreSQL 9.1.2
> > both Server same Hardware.
> >
> > Pgpool configuration:
> >
> > listen_addresses = '*'
> > port = 5432
> > socket_dir = '/var/run/postgresql'
> > pcp_port = 9898
> > pcp_socket_dir = '/tmp'
> > backend_hostname0 = 'localhost'
> > backend_port0 = 5434
> > backend_weight0 = 1
> > backend_data_directory0 = '/var/lib/postgresql/9.1/main'
> > backend_flag0 = 'ALLOW_TO_FAILOVER'
> > backend_hostname1 = '172.16.0.1'
> > backend_port1 = 5434 #doveva essere a 5434
> > backend_weight1 = 1
> > backend_data_directory1 = '/var/lib/postgresql/9.1/main'
> > backend_flag1 = 'ALLOW_TO_FAILOVER'
> > enable_pool_hba = off
> > authentication_timeout = 60
> > # - SSL Connections -
> > num_init_children = 32
> > max_pool = 10
> > child_life_time = 300
> > child_max_connections = 0
> > connection_life_time = 0
> > client_idle_limit = 0
> > log_destination = 'stderr'
> > print_timestamp = on
> > log_connections = off
> > log_hostname = on
> > log_statement = off
> > log_per_node_statement = off
> > log_standby_delay = 'none'
> > syslog_facility = 'LOCAL0'
> > syslog_ident = 'pgpool'
> > debug_level = 0
> > pid_file_name = '/var/run/pgpool/pgpool.pid'
> > logdir = '/tmp'
> > connection_cache = on
> > reset_query_list = 'ABORT; DISCARD ALL'
> > replication_mode = on
> > replicate_select = off
> > insert_lock = on
> > lobj_lock_table = ''
> > replication_stop_on_mismatch = off
> > failover_if_affected_tuples_mismatch = off
> > load_balance_mode =  off
> > ignore_leading_white_space = on
> > white_function_list = ''
> > black_function_list = 'nextval,setval'
> > master_slave_mode = off
> > sr_check_period = 0
> > sr_check_user = 'nobody'
> > sr_check_password = ''
> > delay_threshold = 0
> > follow_master_command = ''
> > parallel_mode = off
> > enable_query_cache = off
> > pgpool2_hostname = 'localhost'
> > system_db_hostname  = 'localhost'
> > system_db_port = 5434
> > system_db_dbname = 'pgpool'
> > system_db_schema = 'pgpool_catalog'
> > system_db_user = 'pgpool'
> > system_db_password = ''
> > health_check_period = 0
> > health_check_timeout = 20
> > health_check_user = 'nobody'
> > health_check_password = ''
> >
> > ------------------------------------
> >
> > The answers about these questions are welcome.
> >
> > Best Regards
> >
> > Nicolas
>
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