[pgpool-general: 5596] Re: Unused status problem

Wed Jun 28 04:13:14 JST 2017

if you want to do native replication (i.e postgres master/slave streaming replication), then you need this in the conf
master_slave_mode =on
master_slave_sub_mode = 'stream'and at the postgres level you must of course set-up the master/slave
Also in your backend_hostname list you have specified two times the slave, so remove the block backend_hostname2 since it is a duplicate of the backend_hostname1.
Pierre

On Tuesday, June 27, 2017, 3:21:52 PM GMT+2, Birnbaum, Warren (ETW) <Warren.Birnbaum at nike.com> wrote:

Hello,

I am trying to install pgpool-II.  I have 2 servers both running postgres 9.4 and pgpool is running on one of the servers.  I am trying to do native replication.  I cannot get the second server to work and it shows as unused.

node_id |   hostname    | port | status | lb_weight |  role  | select_cnt | load_balance_node | replication_delay

---------+---------------+------+--------+-----------+--------+------------+-------------------+-------------------

0       | localhost     | 5432 | up     | 0.538462  | master | 0          | true              | 0

1       | 192.168.33.10 | 5432 | unused | 0.230769  | slave  | 0          | false             | 0

I am not finding much concerning the unused status so I don’t quite know what to change.

Thanks,

Warren

# ----------------------------

# pgPool-II configuration file

# ----------------------------

#

# This file consists of lines of the form:

#

#   name = value

#

# Whitespace may be used.  Comments are introduced with "#" anywhere on a line.

# The complete list of parameter names and allowed values can be found in the

# pgPool-II documentation.

#

# This file is read on server startup and when the server receives a SIGHUP

# signal.  If you edit the file on a running system, you have to SIGHUP the

# server for the changes to take effect, or use "pgpool reload".  Some

# parameters, which are marked below, require a server shutdown and restart to

# take effect.

#

#------------------------------------------------------------------------------

# 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 = '/tmp'

                                   # Unix domain socket path

                                   # The Debian package defaults to

                                   # /var/run/postgresql

                                   # (change requires restart)

listen_backlog_multiplier = 2

                                   # Set the backlog parameter of listen(2) to

                                                                                                                                   # num_init_children * listen_backlog_multiplier.

                                   # (change requires restart)

serialize_accept = off

                                   # whether to serialize accept() call to avoid thundering herd problem

                                   # (change requires restart)

# - pgpool Communication Manager Connection Settings -

pcp_listen_addresses = '*'

                                   # Host name or IP address for pcp process to listen on:

                                   # '*' for all, '' for no TCP/IP connections

                                   # (change requires restart)

pcp_port = 9898

                                   # Port number for pcp

                                   # (change requires restart)

pcp_socket_dir = '/tmp'

                                   # Unix domain socket path for pcp

                                   # The Debian package defaults to

                                   # /var/run/postgresql

                                   # (change requires restart)

# - Backend Connection Settings -

                                   # Host name or IP address to connect to for backend 0

                                   # Port number for backend 0

                                   # Weight for backend 0 (only in load balancing mode)

                                   # Data directory for backend 0

                                   # Controls various backend behavior

                                   # ALLOW_TO_FAILOVER or DISALLOW_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

#------------------------------------------------------------------------------

# - Concurrent session and pool size -

num_init_children = 32

                                   # Number of concurrent sessions allowed

                                   # (change requires restart)

max_pool = 4

                                   # Number of connection pool caches per connection

                                   # (change requires restart)

# - Life time -

child_life_time = 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

                                   # Connection to backend closes after being idle for this many seconds

                                   # 0 means no close

client_idle_limit = 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 = 'syslog'

                                   # Where to log

                                   # Valid values are combinations of stderr,

                                   # and syslog. Default to stderr.

# - What to log -

log_line_prefix = '%t: pid %p:'

log_connections = off

                                   # 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 -

log_error_verbosity = 'TERSE'

client_min_messages = 'debug5'

                                        #   debug5

                                        #   debug4

                                        #   debug3

                                        #   debug2

                                        #   debug1

                                        #   log

                                        #   notice

                                        #   warning

                                        #   error

log_min_messages = debug1             # values in order of decreasing detail:

                                        #   debug5

                                        #   debug4

                                        #   debug3

                                        #   debug2

                                        #   debug1

                                        #   info

                                        #   notice

                                        #   warning

                                        #   error

                                        #   log

                                        #   fatal

                                        #   panic

#------------------------------------------------------------------------------

# FILE LOCATIONS

#------------------------------------------------------------------------------

pid_file_name = '/var/run/pgpool/pgpool.pid'

                                   # PID file name

                                   # (change requires restart)

logdir = '/tmp'

                                   # Directory of pgPool status file

                                   # (change requires restart)

#------------------------------------------------------------------------------

# CONNECTION POOLING

#------------------------------------------------------------------------------

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 = on

                                   # Activate replication mode

                                   # (change requires restart)

replicate_select = off

                                   # Replicate SELECT statements

                                   # when in replication 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 = on

                                   # 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

database_redirect_preference_list = ''

                                                                                                                                   # comma separated list of pairs of database and node id.

                                                                                                                                   # example: postgres:primary,mydb[0-4]:1,mydb[5-9]:2'

                                                                                                                                   # valid for streaming replicaton mode only.

app_name_redirect_preference_list = ''

                                                                                                                                   # comma separated list of pairs of app name and node id.

                                                                                                                                   # example: 'psql:primary,myapp[0-4]:1,myapp[5-9]:standby'

                                                                                                                                   # valid for streaming replicaton mode only.

allow_sql_comments = off

                                                                                                                                   # if on, ignore SQL comments when judging if load balance or

                                                                                                                                   # query cache is possible.

                                                                                                                                   # If off, SQL comments effectively prevent the judgment

                                                                                                                                   # (pre 3.4 behavior).

#------------------------------------------------------------------------------

# 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 = 'nobody'

                                   # Streaming replication check user

                                   # This is neccessary even if you disable streaming

                                   # replication delay check by sr_check_period = 0

sr_check_password = ''

                                   # Password for streaming replication check user

sr_check_database = 'postgres'

                                   # Database name for streaming replication check

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

#------------------------------------------------------------------------------

# HEALTH CHECK

#------------------------------------------------------------------------------

health_check_period = 0

                                   # Health check period

                                   # Disabled (0) by default

health_check_timeout = 20

                                   # Health check timeout

                                   # 0 means no timeout

health_check_user = 'postgres'

                                   # Health check user

health_check_password = 'postgres'

                                   # Password for health check user

health_check_database = 'postgres'

                                   # Database name for health check. If '', tries 'postgres' frist,

health_check_max_retries = 0

                                   # 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.

connect_timeout = 10000

                                   # Timeout value in milliseconds before giving up to connect to backend.

                                                                                                                                   # Default is 10000 ms (10 second). Flaky network user may want to increase

                                                                                                                                   # the value. 0 means no timeout.

                                                                                                                                   # Note that this value is not only used for health check,

                                                                                                                                   # but also for ordinary conection to backend.

#------------------------------------------------------------------------------

# 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 = off

                                   # 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 = 300

                                   # 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 = 'nobody'

                                   # 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_priority = 1

                                                                                                                                                # priority of this watchdog in leader election

                                                                                                                                                # (change requires restart)

wd_authkey = ''

                                    # Authentication key for watchdog communication

                                    # (change requires restart)

wd_ipc_socket_dir = '/tmp'

                                                                                                                                                # Unix domain socket path for watchdog IPC socket

                                                                                                                                                # The Debian package defaults to

                                                                                                                                                # /var/run/postgresql

                                                                                                                                                # (change requires restart)

# - Virtual IP control Setting -

delegate_IP = ''

                                    # delegate IP address

                                    # If this is empty, virtual IP never bring up.

                                    # (change requires restart)

if_cmd_path = '/sbin'

                                    # path to the directory where if_up/down_cmd exists

                                    # (change requires restart)

if_up_cmd = 'ip addr add $_IP_$/24 dev eth0 label eth0:0'

                                    # startup delegate IP command

                                    # (change requires restart)

if_down_cmd = 'ip addr del $_IP_$/24 dev eth0'

                                    # 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)

wd_de_escalation_command = ''

                                                                                                                                                # Executes this command when master pgpool resigns from being master.

                                                                                                                                                # (change requires restart)

# - Lifecheck Setting -

# -- common --

wd_monitoring_interfaces_list = ''  # Comma separated list of interfaces names to monitor.

                                                                                                                                                # if any interface from the list is active the watchdog will

                                                                                                                                                # consider the network is fine

                                                                                                                                                # 'any' to enable monitoring on all interfaces except loopback

                                                                                                                                                # '' to disable monitoring

wd_lifecheck_method = 'heartbeat'

                                    # Method of watchdog lifecheck ('heartbeat' or 'query' or 'external')

                                    # (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)

                                    # Host name or IP address of destination 0

                                    # for sending heartbeat signal.

                                    # (change requires restart)

                                    # Port number of destination 0 for sending

                                    # heartbeat signal. Usually this is the

                                    # same as wd_heartbeat_port.

                                    # (change requires restart)

                                    # 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.

check_unlogged_table = on

                                   # If on, enable unlogged 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 unlogged tables

                                  # and you want to save access to primary/master, you could turn this off.

                                   # Default is on.

#------------------------------------------------------------------------------

# IN 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

backend_hostname0 = 'localhost'

backend_port0 = 5432

backend_weight0 = .7

backend_data_directory0 = '/var/lib/pgsql/9.4/data'

backend_flag0 = 'ALLOW_TO_FAILOVER'

backend_hostname1 = '192.168.33.10'

backend_port1 = 5432

backend_weight1 = .3

backend_data_directory1 = '/var/lib/pgsql/9.4/data'

backend_flag1 = 'ALLOW_TO_FAILOVER'

backend_hostname2 = '192.168.33.10'

backend_port2 = 5432

backend_weight2 = .3

backend_data_directory2 = '/var/lib/pgsql/9.4/data'

backend_flag2 = 'ALLOW_TO_FAILOVER'

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