[pgpool-general: 4094] Re: issue with single node failover

Tatsuo Ishii ishii at postgresql.org
Wed Oct 7 08:17:23 JST 2015


I have confirmed the problem is in 3.4.0 or later, not in 3.3.x or
before.

Usama,

Can you please take care of this? It seems the problem was introduced
in 3.4.0.

protocol/child.c:

		/* In non parallel mode single valid backend is all we need 
		 * to continue 
		 */
		if(valid_backends == 0)
		{
			fatal_error = true;
			error_msg = "pgpool is not accepting any new connections";
			error_detail = "all backend nodes are down, pgpool requires atleast one valid node";
			error_hint = "repair the backend nodes and restart pgpool";
		}

Also "atleast" seems a typo.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp

> I have pgpool 3.4.3 (from the pgdb93 repo) setup in raw mode pointing to a
> single backend node on a separate server.  I would like set pgpool to
> failover to the single node and attempt to reconnect indefinitely.  For
> some reason I can't get the config right or it may be a bug?  I have it
> working in a different environment using pgpool 3.2 from the epel repo
> 
> Any help would be greatly appreciated.
> 
> 
> # Log
> 
> 2015-10-06 09:45:49: pid 13371: DETAIL:  postmaster on DB node 0 was
> shutdown by administrative command
> 2015-10-06 09:45:49: pid 13371: LOG:  received degenerate backend request
> for node_id: 0 from pid [13371]
> 2015-10-06 09:45:49: pid 13361: LOG:  starting degeneration. shutdown host
> 172.16.0.59(5432)
> 2015-10-06 09:45:49: pid 13361: LOG:  failover: no valid backends node found
> 2015-10-06 09:45:49: pid 13361: LOG:  Restart all children
> 2015-10-06 09:45:49: pid 13361: LOG:  failover: set new primary node: -1
> 2015-10-06 09:45:49: pid 13374: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13370: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13376: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13367: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13363: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13373: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13372: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13365: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13364: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13377: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13366: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13375: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13368: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13369: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13371: LOG:  child process received shutdown
> request signal 3
> 2015-10-06 09:45:49: pid 13379: LOG:  worker process received restart
> request
> failover done. shutdown host 172.16.0.59(5432)2015-10-06 09:45:49: pid
> 13361: LOG:  failover done. shutdown host 172.16.0.59(5432)
> 2015-10-06 09:45:50: pid 13378: LOG:  restart request received in pcp child
> process
> 2015-10-06 09:45:50: pid 13361: LOG:  PCP child 13378 exits with status 256
> in failover()
> 2015-10-06 09:45:50: pid 13361: LOG:  fork a new PCP child pid 13399 in
> failover()
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13363 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13363 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13364 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13364 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13365 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13365 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13366 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13366 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13367 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13367 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13368 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13368 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13369 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13369 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13370 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13370 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13371 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13371 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13372 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13372 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13373 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13373 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13374 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13374 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13375 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13375 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13376 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13376 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13377 exits
> with status 0
> 2015-10-06 09:45:50: pid 13361: LOG:  child process with pid: 13377 exited
> with success and will not be restarted
> 2015-10-06 09:45:50: pid 13361: LOG:  worker child process with pid: 13379
> exits with status 256
> 2015-10-06 09:45:50: pid 13361: LOG:  fork a new worker child process with
> pid: 13400
> 2015-10-06 09:46:02: pid 13392: FATAL:  pgpool is not accepting any new
> connections
> 2015-10-06 09:46:02: pid 13392: DETAIL:  all backend nodes are down, pgpool
> requires atleast one valid node
> 2015-10-06 09:46:02: pid 13392: HINT:  repair the backend nodes and restart
> pgpool
> 2015-10-06 09:46:02: pid 13361: LOG:  child process with pid: 13392 exits
> with status 256
> 2015-10-06 09:46:02: pid 13361: LOG:  fork a new child process with pid:
> 13401
> 2015-10-06 09:46:27: pid 13401: FATAL:  pgpool is not accepting any new
> connections
> 2015-10-06 09:46:27: pid 13401: DETAIL:  all backend nodes are down, pgpool
> requires atleast one valid node
> 2015-10-06 09:46:27: pid 13401: HINT:  repair the backend nodes and restart
> pgpool
> 2015-10-06 09:46:27: pid 13361: LOG:  child process with pid: 13401 exits
> with status 256
> 2015-10-06 09:46:27: pid 13361: LOG:  fork a new child process with pid:
> 13410
> 2015-10-06 09:46:34: pid 13390: FATAL:  pgpool is not accepting any new
> connections
> 2015-10-06 09:46:34: pid 13390: DETAIL:  all backend nodes are down, pgpool
> requires atleast one valid node
> 2015-10-06 09:46:34: pid 13390: HINT:  repair the backend nodes and restart
> pgpool
> 2015-10-06 09:46:34: pid 13361: LOG:  child process with pid: 13390 exits
> with status 256
> 2015-10-06 09:46:34: pid 13361: LOG:  fork a new child process with pid:
> 13412
> 
> 
> 
> 
> 
> # Config File
> 
> #------------------------------------------------------------------------------
> # CONNECTIONS
> #------------------------------------------------------------------------------
> 
> # - pgpool Connection Settings -
> 
> listen_addresses = '*'
>                                    # Host name or IP address to listen on:
>                                    # '*' for all, '' for no TCP/IP
> connections
>                                    # (change requires restart)
> port = 9999
>                                    # Port number
>                                    # (change requires restart)
> socket_dir = '/var/run/pgpool-II-93'
>                                    # Unix domain socket path
>                                    # (change requires restart)
> 
> 
> # - pgpool Communication Manager Connection Settings -
> 
> pcp_port = 9898
>                                    # Port number for pcp
>                                    # (change requires restart)
> pcp_socket_dir = '/var/run/pgpool-II-93'
>                                    # Unix domain socket path for pcp
>                                    # (change requires restart)
> 
> # - Backend Connection Settings -
> 
> backend_hostname0 = '172.16.0.59'
>                                    # Host name or IP address to connect to
> for backend 0
> backend_port0 = 5432
>                                    # Port number for backend 0
> # backend_weight0 = 1
>                                    # Weight for backend 0 (only in load
> balancing mode)
> # backend_data_directory0 = '/var/lib/pgsql/9.3/data'
>                                    # Data directory for backend 0
> backend_flag0 = 'ALLOW_TO_FAILOVER'
>                                    # Controls various backend behavior
>                                    # ALLOW_TO_FAILOVER or
> DISALLOW_TO_FAILOVER
> #backend_hostname1 = 'host2'
> #backend_port1 = 5433
> #backend_weight1 = 1
> #backend_data_directory1 = '/data1'
> #backend_flag1 = 'ALLOW_TO_FAILOVER'
> 
> # - Authentication -
> 
> enable_pool_hba = off
>                                    # Use pool_hba.conf for client
> authentication
> pool_passwd = 'pool_passwd'
>                                    # File name of pool_passwd for md5
> authentication.
>                                    # "" disables pool_passwd.
>                                    # (change requires restart)
> authentication_timeout = 60
>                                    # Delay in seconds to complete client
> authentication
>                                    # 0 means no timeout.
> 
> # - SSL Connections -
> 
> ssl = off
>                                    # Enable SSL support
>                                    # (change requires restart)
> #ssl_key = './server.key'
>                                    # Path to the SSL private key file
>                                    # (change requires restart)
> #ssl_cert = './server.cert'
>                                    # Path to the SSL public certificate file
>                                    # (change requires restart)
> #ssl_ca_cert = ''
>                                    # Path to a single PEM format file
>                                    # containing CA root certificate(s)
>                                    # (change requires restart)
> #ssl_ca_cert_dir = ''
>                                    # Directory containing CA root
> certificate(s)
>                                    # (change requires restart)
> 
> 
> #------------------------------------------------------------------------------
> # POOLS
> #------------------------------------------------------------------------------
> 
> # - Pool size -
> 
> num_init_children = 15
>                                    # Number of pools
>                                   # (change requires restart)
> max_pool = 1
>                                    # Number of connections per pool
>                                    # (change requires restart)
> 
> # - Life time -
> 
> child_life_time = 120 # was 300
>                                    # Pool exits after being idle for this
> many seconds
> child_max_connections = 0
>                                    # Pool exits after receiving that many
> connections
>                                    # 0 means no exit
> connection_life_time = 0 # was 0
>                                    # Connection to backend closes after
> being idle for this many seconds
>                                    # 0 means no close
> client_idle_limit = 0 # was 0
>                                    # Client is disconnected after being
> idle for that many seconds
>                                    # (even inside an explicit transactions!)
>                                    # 0 means no disconnection
> 
> 
> #------------------------------------------------------------------------------
> # LOGS
> #------------------------------------------------------------------------------
> 
> # - Where to log -
> 
> log_destination = 'stderr'
>                                    # Where to log
>                                    # Valid values are combinations of
> stderr,
>                                    # and syslog. Default to stderr.
> 
> # - What to log -
> 
> print_timestamp = on
>                                    # Print timestamp on each line
>                                    # (change requires restart)
> 
> log_connections = on
>                                    # Log connections
> log_hostname = off
>                                    # Hostname will be shown in ps status
>                                    # and in logs if connections are logged
> log_statement = off
>                                    # Log all statements
> log_per_node_statement = off
>                                    # Log all statements
>                                    # with node and backend informations
> log_standby_delay = 'none'
>                                    # Log standby delay
>                                    # Valid values are combinations of
> always,
>                                    # if_over_threshold, none
> 
> # - Syslog specific -
> 
> syslog_facility = 'LOCAL0'
>                                    # Syslog local facility. Default to
> LOCAL0
> syslog_ident = 'pgpool'
>                                    # Syslog program identification string
>                                    # Default to 'pgpool'
> 
> # - Debug -
> 
> debug_level = 2
>                                    # Debug message verbosity level
>                                    # 0 means no message, 1 or more mean
> verbose
> 
> 
> #------------------------------------------------------------------------------
> # FILE LOCATIONS
> #------------------------------------------------------------------------------
> 
> pid_file_name = '/var/run/pgpool-II-93/pgpool.pid'
>                                    # PID file name
>                                    # (change requires restart)
> logdir = '/var/log/pgpool-II'
>                                    # Directory of pgPool status file
>                                    # (change requires restart)
> 
> 
> #------------------------------------------------------------------------------
> # CONNECTION POOLING
> #------------------------------------------------------------------------------
> 
> #connection_cache = off
> connection_cache = on
>                                    # Activate connection pools
>                                    # (change requires restart)
> 
>                                    # Semicolon separated list of queries
>                                    # to be issued at the end of a session
>                                    # The default is for 8.3 and later
> reset_query_list = 'ABORT; DISCARD ALL'
>                                    # The following one is for 8.2 and before
> #reset_query_list = 'ABORT; RESET ALL; SET SESSION AUTHORIZATION DEFAULT'
> 
> 
> #------------------------------------------------------------------------------
> # REPLICATION MODE
> #------------------------------------------------------------------------------
> 
> replication_mode = off
>                                    # Activate replication mode
>                                    # (change requires restart)
> replicate_select = off
>                                    # Replicate SELECT statements
>                                    # when in replication or parallel mode
>                                    # replicate_select is higher priority
> than
>                                    # load_balance_mode.
> 
> insert_lock = on
>                                    # Automatically locks a dummy row or a
> table
>                                    # with INSERT statements to keep SERIAL
> data
>                                    # consistency
>                                    # Without SERIAL, no lock will be issued
> lobj_lock_table = ''
>                                    # When rewriting lo_creat command in
>                                    # replication mode, specify table name to
>                                    # lock
> 
> # - Degenerate handling -
> 
> replication_stop_on_mismatch = off
>                                    # On disagreement with the packet kind
>                                    # sent from backend, degenerate the node
>                                    # which is most likely "minority"
>                                    # If off, just force to exit this session
> 
> failover_if_affected_tuples_mismatch = off
>                                    # On disagreement with the number of
> affected
>                                    # tuples in UPDATE/DELETE queries, then
>                                    # degenerate the node which is most
> likely
>                                    # "minority".
>                                    # If off, just abort the transaction to
>                                    # keep the consistency
> 
> 
> #------------------------------------------------------------------------------
> # LOAD BALANCING MODE
> #------------------------------------------------------------------------------
> 
> load_balance_mode = off
>                                    # Activate load balancing mode
>                                    # (change requires restart)
> ignore_leading_white_space = on
>                                    # Ignore leading white spaces of each
> query
> white_function_list = ''
>                                    # Comma separated list of function names
>                                    # that don't write to database
>                                    # Regexp are accepted
> black_function_list = 'nextval,setval'
>                                    # Comma separated list of function names
>                                    # that write to database
>                                    # Regexp are accepted
> 
> 
> #------------------------------------------------------------------------------
> # MASTER/SLAVE MODE
> #------------------------------------------------------------------------------
> 
> master_slave_mode = off
>                                    # Activate master/slave mode
>                                    # (change requires restart)
> master_slave_sub_mode = 'slony'
>                                    # Master/slave sub mode
>                                    # Valid values are combinations slony or
>                                    # stream. Default is slony.
>                                    # (change requires restart)
> 
> # - Streaming -
> 
> sr_check_period = 0
>                                    # Streaming replication check period
>                                    # Disabled (0) by default
> sr_check_user = 'webserver'
>                                    # Streaming replication check user
>                                    # This is necessary even if you disable
>                                    # streaming replication delay check with
>                                    # sr_check_period = 0
> sr_check_password = ''
>                                    # Password for streaming replication
> check user
> delay_threshold = 0
>                                    # Threshold before not dispatching query
> to standby node
>                                    # Unit is in bytes
>                                    # Disabled (0) by default
> 
> # - Special commands -
> 
> follow_master_command = ''
>                                    # Executes this command after master
> failover
>                                    # Special values:
>                                    #   %d = node id
>                                    #   %h = host name
>                                    #   %p = port number
>                                    #   %D = database cluster path
>                                    #   %m = new master node id
>                                    #   %H = hostname of the new master node
>                                    #   %M = old master node id
>                                    #   %P = old primary node id
>                                    #   %r = new master port number
>                                    #   %R = new master database cluster path
>                                    #   %% = '%' character
> 
> 
> #------------------------------------------------------------------------------
> # PARALLEL MODE
> #------------------------------------------------------------------------------
> 
> parallel_mode = off
>                                    # Activates parallel query mode
>                                    # (change requires restart)
> pgpool2_hostname = ''
>                                    # Set pgpool2 hostname
>                                    # (change requires restart)
> 
> # - System DB info -
> 
> system_db_hostname  = 'localhost'
>                                    # (change requires restart)
> system_db_port = 5432
>                                    # (change requires restart)
> system_db_dbname = 'pgpool'
>                                    # (change requires restart)
> system_db_schema = 'pgpool_catalog'
>                                    # (change requires restart)
> system_db_user = 'pgpool'
>                                    # (change requires restart)
> system_db_password = ''
>                                    # (change requires restart)
> 
> 
> #------------------------------------------------------------------------------
> # HEALTH CHECK
> #------------------------------------------------------------------------------
> 
> health_check_period = 10
>                                    # Health check period
>                                    # Disabled (0) by default
> health_check_timeout = 10
>                                    # Health check timeout
>                                    # 0 means no timeout
> health_check_user = 'webserver'
>                                    # Health check user
> health_check_password = ''
>                                    # Password for health check user
> health_check_max_retries = 30
>                                    # Maximum number of times to retry a
> failed health check before giving up.
> health_check_retry_delay = 1
>                                    # Amount of time to wait (in seconds)
> between retries.
> 
> 
> #------------------------------------------------------------------------------
> # FAILOVER AND FAILBACK
> #------------------------------------------------------------------------------
> 
> failover_command = ''
>                                    # Executes this command at failover
>                                    # Special values:
>                                    #   %d = node id
>                                    #   %h = host name
>                                    #   %p = port number
>                                    #   %D = database cluster path
>                                    #   %m = new master node id
>                                    #   %H = hostname of the new master node
>                                    #   %M = old master node id
>                                    #   %P = old primary node id
>                                    #   %r = new master port number
>                                    #   %R = new master database cluster path
>                                    #   %% = '%' character
> failback_command = ''
>                                    # Executes this command at failback.
>                                    # Special values:
>                                    #   %d = node id
>                                    #   %h = host name
>                                    #   %p = port number
>                                    #   %D = database cluster path
>                                    #   %m = new master node id
>                                    #   %H = hostname of the new master node
>                                    #   %M = old master node id
>                                    #   %P = old primary node id
>                                    #   %r = new master port number
>                                    #   %R = new master database cluster path
>                                    #   %% = '%' character
> 
> 
> 
> 
> fail_over_on_backend_error = on
>                                    # Initiates failover when
> reading/writing to the
>                                    # backend communication socket fails
>                                    # If set to off, pgpool will report an
>                                    # error and disconnect the session.
> 
> search_primary_node_timeout = 0
>                                    # Timeout in seconds to search for the
>                                    # primary node when a failover occurs.
>                                    # 0 means no timeout, keep searching
>                                    # for a primary node forever.
> 
> #------------------------------------------------------------------------------
> # ONLINE RECOVERY
> #------------------------------------------------------------------------------
> 
> recovery_user = 'webserver'
>                                    # Online recovery user
> recovery_password = ''
>                                    # Online recovery password
> recovery_1st_stage_command = ''
>                                    # Executes a command in first stage
> recovery_2nd_stage_command = ''
>                                    # Executes a command in second stage
> recovery_timeout = 90
>                                    # Timeout in seconds to wait for the
>                                    # recovering node's postmaster to start
> up
>                                    # 0 means no wait
> client_idle_limit_in_recovery = 0
>                                    # Client is disconnected after being idle
>                                    # for that many seconds in the second
> stage
>                                    # of online recovery
>                                    # 0 means no disconnection
>                                    # -1 means immediate disconnection
> 
> 
> #------------------------------------------------------------------------------
> # WATCHDOG
> #------------------------------------------------------------------------------
> 
> # - Enabling -
> 
> use_watchdog = off
>                                     # Activates watchdog
>                                     # (change requires restart)
> 
> # -Connection to up stream servers -
> 
> trusted_servers = ''
>                                     # trusted server list which are used
>                                     # to confirm network connection
>                                     # (hostA,hostB,hostC,...)
>                                     # (change requires restart)
> ping_path = '/bin'
>                                     # ping command path
>                                     # (change requires restart)
> 
> # - Watchdog communication Settings -
> 
> wd_hostname = ''
>                                     # Host name or IP address of this
> watchdog
>                                     # (change requires restart)
> wd_port = 9000
>                                     # port number for watchdog service
>                                     # (change requires restart)
> wd_authkey = ''
>                                     # Authentication key for watchdog
> communication
>                                     # (change requires restart)
> 
> # - Virtual IP control Setting -
> 
> delegate_IP = ''
>                                     # delegate IP address
>                                     # If this is empty, virtual IP never
> bring up.
>                                     # (change requires restart)
> ifconfig_path = '/sbin'
>                                     # ifconfig command path
>                                     # (change requires restart)
> if_up_cmd = 'ifconfig eth0:0 inet $_IP_$ netmask 255.255.255.0'
>                                     # startup delegate IP command
>                                     # (change requires restart)
> if_down_cmd = 'ifconfig eth0:0 down'
>                                     # shutdown delegate IP command
>                                     # (change requires restart)
> 
> arping_path = '/usr/sbin'           # arping command path
>                                     # (change requires restart)
> 
> arping_cmd = 'arping -U $_IP_$ -w 1'
>                                     # arping command
>                                     # (change requires restart)
> 
> # - Behaivor on escalation Setting -
> 
> clear_memqcache_on_escalation = on
>                                     # Clear all the query cache on shared
> memory
>                                     # when standby pgpool escalate to
> active pgpool
>                                     # (= virtual IP holder).
>                                     # This should be off if client connects
> to pgpool
>                                     # not using virtual IP.
>                                     # (change requires restart)
> wd_escalation_command = ''
>                                     # Executes this command at escalation
> on new active pgpool.
>                                     # (change requires restart)
> 
> # - Lifecheck Setting -
> 
> # -- common --
> 
> wd_lifecheck_method = 'heartbeat'
>                                     # Method of watchdog lifecheck
> ('heartbeat' or 'query')
>                                     # (change requires restart)
> wd_interval = 10
>                                     # lifecheck interval (sec) > 0
>                                     # (change requires restart)
> 
> # -- heartbeat mode --
> 
> wd_heartbeat_port = 9694
>                                     # Port number for receiving heartbeat
> signal
>                                     # (change requires restart)
> wd_heartbeat_keepalive = 2
>                                     # Interval time of sending heartbeat
> signal (sec)
>                                     # (change requires restart)
> wd_heartbeat_deadtime = 30
>                                     # Deadtime interval for heartbeat
> signal (sec)
>                                     # (change requires restart)
> heartbeat_destination0 = 'host0_ip1'
>                                     # Host name or IP address of
> destination 0
>                                     # for sending heartbeat signal.
>                                     # (change requires restart)
> heartbeat_destination_port0 = 9694
>                                     # Port number of destination 0 for
> sending
>                                     # heartbeat signal. Usually this is the
>                                     # same as wd_heartbeat_port.
>                                     # (change requires restart)
> heartbeat_device0 = ''
>                                     # Name of NIC device (such like 'eth0')
>                                     # used for sending/receiving heartbeat
>                                     # signal to/from destination 0.
>                                     # This works only when this is not empty
>                                     # and pgpool has root privilege.
>                                     # (change requires restart)
> 
> #heartbeat_destination1 = 'host0_ip2'
> #heartbeat_destination_port1 = 9694
> #heartbeat_device1 = ''
> 
> # -- query mode --
> 
> wd_life_point = 3
>                                     # lifecheck retry times
>                                     # (change requires restart)
> wd_lifecheck_query = 'SELECT 1'
>                                     # lifecheck query to pgpool from
> watchdog
>                                     # (change requires restart)
> wd_lifecheck_dbname = 'template1'
>                                     # Database name connected for lifecheck
>                                     # (change requires restart)
> wd_lifecheck_user = 'nobody'
>                                     # watchdog user monitoring pgpools in
> lifecheck
>                                     # (change requires restart)
> wd_lifecheck_password = ''
>                                     # Password for watchdog user in
> lifecheck
>                                     # (change requires restart)
> 
> # - Other pgpool Connection Settings -
> 
> #other_pgpool_hostname0 = 'host0'
>                                     # Host name or IP address to connect to
> for other pgpool 0
>                                     # (change requires restart)
> #other_pgpool_port0 = 5432
>                                     # Port number for othet pgpool 0
>                                     # (change requires restart)
> #other_wd_port0 = 9000
>                                     # Port number for othet watchdog 0
>                                     # (change requires restart)
> #other_pgpool_hostname1 = 'host1'
> #other_pgpool_port1 = 5432
> #other_wd_port1 = 9000
> 
> 
> #------------------------------------------------------------------------------
> # OTHERS
> #------------------------------------------------------------------------------
> relcache_expire = 0
>                                    # Life time of relation cache in seconds.
>                                    # 0 means no cache expiration(the
> default).
>                                    # The relation cache is used for cache
> the
>                                    # query result against PostgreSQL system
>                                    # catalog to obtain various information
>                                    # including table structures or if it's a
>                                    # temporary table or not. The cache is
>                                    # maintained in a pgpool child local
> memory
>                                    # and being kept as long as it survives.
>                                    # If someone modify the table by using
>                                    # ALTER TABLE or some such, the relcache
> is
>                                    # not consistent anymore.
>                                    # For this purpose, cache_expiration
>                                    # controls the life time of the cache.
> 
> relcache_size = 256
>                                    # Number of relation cache
>                                    # entry. If you see frequently:
>                                    # "pool_search_relcache: cache
> replacement happend"
>                                    # in the pgpool log, you might want to
> increate this number.
> 
> check_temp_table = on
>                                    # If on, enable temporary table check in
> SELECT statements.
>                                    # This initiates queries against system
> catalog of primary/master
>                                    # thus increases load of master.
>                                    # If you are absolutely sure that your
> system never uses temporary tables
>                                    # and you want to save access to
> primary/master, you could turn this off.
>                                    # Default is on.
> 
> 
> #------------------------------------------------------------------------------
> # ON MEMORY QUERY MEMORY CACHE
> #------------------------------------------------------------------------------
> memory_cache_enabled = off
>                                    # If on, use the memory cache
> functionality, off by default
> memqcache_method = 'shmem'
>                                    # Cache storage method. either
> 'shmem'(shared memory) or
>                                    # 'memcached'. 'shmem' by default
>                                    # (change requires restart)
> memqcache_memcached_host = 'localhost'
>                                    # Memcached host name or IP address.
> Mandatory if
>                                    # memqcache_method = 'memcached'.
>                                    # Defaults to localhost.
>                                    # (change requires restart)
> memqcache_memcached_port = 11211
>                                    # Memcached port number. Mondatory if
> memqcache_method = 'memcached'.
>                                    # Defaults to 11211.
>                                    # (change requires restart)
> memqcache_total_size = 67108864
>                                    # Total memory size in bytes for storing
> memory cache.
>                                    # Mandatory if memqcache_method =
> 'shmem'.
>                                    # Defaults to 64MB.
>                                    # (change requires restart)
> memqcache_max_num_cache = 1000000
>                                    # Total number of cache entries.
> Mandatory
>                                    # if memqcache_method = 'shmem'.
>                                    # Each cache entry consumes 48 bytes on
> shared memory.
>                                    # Defaults to 1,000,000(45.8MB).
>                                    # (change requires restart)
> memqcache_expire = 0
>                                    # Memory cache entry life time specified
> in seconds.
>                                    # 0 means infinite life time. 0 by
> default.
>                                    # (change requires restart)
> memqcache_auto_cache_invalidation = on
>                                    # If on, invalidation of query cache is
> triggered by corresponding
>                                    # DDL/DML/DCL(and memqcache_expire).  If
> off, it is only triggered
>                                    # by memqcache_expire.  on by default.
>                                    # (change requires restart)
> memqcache_maxcache = 409600
>                                    # Maximum SELECT result size in bytes.
>                                    # Must be smaller than
> memqcache_cache_block_size. Defaults to 400KB.
>                                    # (change requires restart)
> memqcache_cache_block_size = 1048576
>                                    # Cache block size in bytes. Mandatory
> if memqcache_method = 'shmem'.
>                                    # Defaults to 1MB.
>                                    # (change requires restart)
> memqcache_oiddir = '/var/log/pgpool/oiddir'
>                                       # Temporary work directory to record
> table oids
>                                    # (change requires restart)
> white_memqcache_table_list = ''
>                                    # Comma separated list of table names to
> memcache
>                                    # that don't write to database
>                                    # Regexp are accepted
> black_memqcache_table_list = ''
>                                    # Comma separated list of table names
> not to memcache
>                                    # that don't write to database
>                                    # Regexp are accepted
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> -- 
> [image: FBS Logo]
> 
> *Travis Kirstine*, Web Development Supervisor
> *t *905‑477‑3600* x *301 | *m *647‑534‑4798 |
> tkirstine at firstbasesolution.com
> 
> *First Base Solutions Inc.*
> 140 Renfrew Drive, Suite 100 | Markham | Ontario | L3R 6B3
> *t* 905‑477‑3600 | *f* 905‑477‑0892 | www.firstbasesolutions.com


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