[pgpool-general: 3504] Re: pgpool failover problems
Steve Kuekes
steve.kuekes at physicianspharmacy.com
Mon Mar 9 23:46:12 JST 2015
This error is occuring on a production server so I cannot upgrade it to
3.3.5 for a while. We have test servers, but it appears that this
happens under high load and I have not been able to replicate it on our
test server.
I have attached the pgpool.conf file from the system.
The postgres version is "PostgreSQL 9.3.5 on x86_64-unknown-linux-gnu,
compiled by gcc (Debian 4.7.2-5) 4.7.2, 64-bit"
Here is the snippet of the pool.log file then the problem occurs.
Mar 5 12:49:56 ppasv57 pgpool[5500]: ProcessFrontendResponse: failed to
read kind from frontend. frontend abnormally exited
Mar 5 12:50:03 ppasv57 pgpool[1421]: pgpool detected difference of the
number of inserted, updated or deleted tuples. Possible last query was:
"update ppadata.notebase set ntbmsgcount=$1,ntbupdated=$2 where ntbid=$3"
Mar 5 12:50:03 ppasv57 pgpool[1421]: CommandComplete: Number of
affected tuples are: 1 0
Mar 5 12:50:03 ppasv57 pgpool[1421]: ReadyForQuery: Degenerate backends: 1
Mar 5 12:50:03 ppasv57 pgpool[1421]: ReadyForQuery: Number of affected
tuples are: 1 0
Mar 5 12:50:03 ppasv57 pgpool[1421]: degenerate_backend_set: 1 fail
over request from pid 1421
Mar 5 12:50:03 ppasv57 pgpool[2896]: starting degeneration. shutdown
host ppasv59g(9999)
Mar 5 12:50:03 ppasv57 pgpool[2896]: Restart all children
Mar 5 12:50:03 ppasv57 pgpool[2896]: execute command: echo
host:ppasv59g, new master id:0, old master id:0 | mail -s pgpool\
failover notifier at rxhealthcare.org
Mar 5 12:50:04 ppasv57 pgpool[2896]: failover: set new primary node: -1
Mar 5 12:50:04 ppasv57 pgpool[2896]: failover: set new master node: 0
Mar 5 12:50:04 ppasv57 pgpool[2896]: failover done. shutdown host
ppasv59g(9999)
Mar 5 12:50:04 ppasv57 pgpool[14731]: worker process received restart
request
Mar 5 12:50:05 ppasv57 pgpool[14730]: pcp child process received
restart request
Mar 5 12:50:05 ppasv57 pgpool[2896]: PCP child 14730 exits with status
256 in failover()
Mar 5 12:50:05 ppasv57 pgpool[2896]: fork a new PCP child pid 6222 in
failover()
Mar 5 12:50:05 ppasv57 pgpool[2896]: worker child 14731 exits with
status 256
Mar 5 12:50:05 ppasv57 pgpool[2896]: fork a new worker child pid 6223
Let me know if you need more information.
Steve
On 03/09/2015 10:29 AM, Muhammad Usama wrote:
> Hi
>
> I am trying to investigate the issue, meanwhile, can you please share
> the pgpool.conf file, pgpool-II log file when the problem occurs and
> PostgreSQL version information.
>
> Also pgpool-II 3.3.2 is little older. Can you confirm if the
> problem persists after updating to the latest version 3.3.5
>
> Thanks
> Kind regards!
> Muhammad Usama
>
> On Fri, Mar 6, 2015 at 8:01 PM, Steve Kuekes
> <steve.kuekes at physicianspharmacy.com
> <mailto:steve.kuekes at physicianspharmacy.com>> wrote:
>
> pgpool is handling the replication
>
> I have
>
> replication_mode = on
>
> in my configuration. The question is how can the 2 nodes get out
> of sync. All database access to the Postgres nodes is going
> through pgpool.
>
> Steve
>
>
> On 03/06/2015 09:41 AM, Muhammad Usama wrote:
>> Hi Steve
>>
>> What kind of replication are you using between backend nodes?
>>
>> /*replication_stop_on_mismatch*/ and
>> /*failover_if_affected_tuples_mismatch*/ configuration parameters
>> dictate the behavior of pgpool-II, when the synchronization
>> problem between PostgreSQL backends is detected. These
>> parameters have nothing to do for keeping the data consistent
>> between nodes. For that you have to check why one of the node
>> lacks behind the other.
>>
>> Thanks
>> Kind regards!
>> Muhammad Usama
>>
>> On Fri, Mar 6, 2015 at 1:42 AM, Steve Kuekes
>> <steve.kuekes at physicianspharmacy.com
>> <mailto:steve.kuekes at physicianspharmacy.com>> wrote:
>> > I am running pgpool version pgpool-II version 3.3.2
>> (tokakiboshi) in
>> > replication mode with 2 back ends with load balancing. We have
>> a very busy
>> > database and we cannot seem to keep both back ends up for
>> longer that 12-16
>> > hours of production.
>> >
>> > These are the messages I get in the pgpool log when the
>> failover occurs
>> >
>> > Mar 5 12:50:03 ppasv57 pgpool[1421]: pgpool detected
>> difference of the
>> > number of inserted, updated or deleted tuples. Possible last
>> query was:
>> > "update ppadata.notebase set ntbmsgcount=$1,ntbupdated=$2 where
>> ntbid=$3"
>> > Mar 5 12:50:03 ppasv57 pgpool[1421]: CommandComplete: Number
>> of affected
>> > tuples are: 1 0
>> > Mar 5 12:50:03 ppasv57 pgpool[1421]: ReadyForQuery: Degenerate
>> backends: 1
>> > Mar 5 12:50:03 ppasv57 pgpool[1421]: ReadyForQuery: Number of
>> affected
>> > tuples are: 1 0
>> > Mar 5 12:50:03 ppasv57 pgpool[1421]: degenerate_backend_set: 1
>> fail over
>> > request from pid 1421
>> > Mar 5 12:50:03 ppasv57 pgpool[2896]: starting degeneration.
>> shutdown host
>> > ppasv59g(9999)
>> > Mar 5 12:50:03 ppasv57 pgpool[2896]: Restart all children
>> >
>> > This update statement is being done within a postgres
>> transaction and it
>> > appears after the failover the transaction was successfully
>> rolled back on
>> > both back ends.
>> >
>> > We have the following options set in the pgpool.conf
>> >
>> > replication_stop_on_mismatch = on
>> > failover_if_affected_tuples_mismatch = on
>> >
>> > Don't we need to have these options set to make sure that both
>> back ends
>> > have exactly the same data?
>> >
>> > What do I need to do to keep both back ends up?
>> >
>> > Thanks for any help
>> >
>> > Steve
>> >
>> > --
>> > Steve Kuekes
>> >
>> > Physicians Pharmacy Alliance
>> > 118 MacKenan Drive, Suite 200
>> > Cary, NC 27511
>> > 919-465-5801 direct
>> > 919-463-5555 main
>> > 919-463-5566 fax
>> >
>> > steve.kuekes at physicianspharmacy.com
>> <mailto:steve.kuekes at physicianspharmacy.com>
>> >
>> > _______________________________________________
>> > pgpool-general mailing list
>> > pgpool-general at pgpool.net <mailto:pgpool-general at pgpool.net>
>> > http://www.pgpool.net/mailman/listinfo/pgpool-general
>
> --
> Steve Kuekes
>
> Physicians Pharmacy Alliance
> 118 MacKenan Drive, Suite 200
> Cary, NC 27511
> 919-465-5801 direct
> 919-463-5555 main
> 919-463-5566 fax
>
> steve.kuekes at physicianspharmacy.com <mailto:steve.kuekes at physicianspharmacy.com>
>
>
--
Steve Kuekes
Physicians Pharmacy Alliance
118 MacKenan Drive, Suite 200
Cary, NC 27511
919-465-5801 direct
919-463-5555 main
919-463-5566 fax
steve.kuekes at physicianspharmacy.com
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# ----------------------------
# 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 = 5432
# Port number
# (change requires restart)
socket_dir = '/tmp'
# Unix domain socket path
# The Debian package defaults to
# /var/run/postgresql
# (change requires restart)
# - pgpool Communication Manager Connection Settings -
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 -
backend_hostname0 = 'ppasv58g'
# Host name or IP address to connect to for backend 0
backend_port0 = 9999
# Port number for backend 0
backend_weight0 = 1
# Weight for backend 0 (only in load balancing mode)
backend_data_directory0 = '/postgresdb'
# Data directory for backend 0
#backend_flag0 = 'ALLOW_TO_FAILOVER'
# Controls various backend behavior
# ALLOW_TO_FAILOVER or DISALLOW_TO_FAILOVER
backend_hostname1 = 'ppasv59g'
backend_port1 = 9999
backend_weight1 = 1
backend_data_directory1 = '/postgresdb'
#backend_flag1 = 'ALLOW_TO_FAILOVER'
# - Authentication -
enable_pool_hba = on
# 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 = 500
# Number of pools
# (change requires restart)
max_pool = 1
# Number of connections per pool
# (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 -
print_timestamp = on
# Print timestamp on each line
# (change requires restart)
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 -
debug_level = 0
# Debug message verbosity level
# 0 means no message, 1 or more mean verbose
#------------------------------------------------------------------------------
# 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 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 = on
# 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 = on
# 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,pg_start_backup,pg_stop_backup,pg_switch_xlog'
# 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 = 'nobody'
# 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 = 9999
# (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 = 30
# 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 = '????'
# Password for health check user
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.
#------------------------------------------------------------------------------
# FAILOVER AND FAILBACK
#------------------------------------------------------------------------------
failover_command = 'echo host:%h, new master id:%m, old master id:%M | mail -s pgpool\ failover notifier at rxhealthcare.org'
# 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 = 'echo host:%h, new master id:%m, old master id:%M | mail -s pgpool\ failback notifier at rxhealthcare.org'
# 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 = 10
# 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 = 'postgres'
# Online recovery user
recovery_password = '???'
# Online recovery password
recovery_1st_stage_command = 'copy_base_backup'
# Executes a command in first stage
recovery_2nd_stage_command = 'pgpool_recovery_pitr'
# 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 = 5
# 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
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