[pgpool-hackers: 2300] Re: RFC: New health check implementation
Muhammad Usama
m.usama at gmail.com
Fri Apr 28 15:15:53 JST 2017
On Fri, Apr 28, 2017 at 5:47 AM, Tatsuo Ishii <ishii at sraoss.co.jp> wrote:
> Usama,
>
> Unfortunately after applying your patches, pgpool won't start any
> more. Here's back trace info. pgpool.conf attached.
>
I think you need to delete *src/config/pool_config.c* and
*src/tools/pgmd5/pool_config.c* autogenerated files before building the
Pgpool-II, The reason being the memory for POOL_CONFIG->health_check_params
is allocated in pgpool_config.l and apparently the make is not regenerating
the pgpool_config.c.
I was also wondering that we could use the array for health_check_params in
POOL_CONFIG rather than a pointer and allocating it dynamically.
Thanks
Best regards
Muhammad Usama
>
>
> t-ishii at localhost: gdb /home/t-ishii/work/pgpool-II/current/bin/pgpool
> GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.04) 7.11.1
> Copyright (C) 2016 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.
> html>
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> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from /home/t-ishii/work/pgpool-II/
> current/bin/pgpool...done.
> (gdb) run -D -n -f /home/t-ishii/work/pgpool-II/
> current/Bugs/bug301-memcache-segfault/testdir/etc/pgpool.conf -F
> /home/t-ishii/work/pgpool-II/current/Bugs/bug301-memcache-segfault/testdir/etc/pcp.conf
> -a $dir/etc/pool_hba.conf
> Starting program: /home/t-ishii/work/pgpool-II/current/bin/pgpool -D -n
> -f /home/t-ishii/work/pgpool-II/current/Bugs/bug301-memcache-
> segfault/testdir/etc/pgpool.conf -F /home/t-ishii/work/pgpool-II/
> current/Bugs/bug301-memcache-segfault/testdir/etc/pcp.conf -a
> $dir/etc/pool_hba.conf
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0000000000411e22 in HealthCheckMaxRetriesAssignFunc
> (context=CFGCXT_BOOT, newval=0, index=0, elevel=20)
> at config/pool_config_variables.c:3754
> 3754 g_pool_config.health_check_params[index].health_check_max_retries
> = newval;
> (gdb) p g_pool_config.health_check_params
> $1 = (HealthCheckParams *) 0x0
> (gdb)
>
> From: Muhammad Usama <m.usama at gmail.com>
> Subject: Re: [pgpool-hackers: 2213] RFC: New health check implementation
> Date: Thu, 27 Apr 2017 21:27:29 +0500
> Message-ID: <CAEJvTzV-JtRLBzH1Z=Y3QJWx+xXSYKd_2R5Gmv+tnRkz+9_+8g@
> mail.gmail.com>
>
> > Hi Ishii-San
> >
> > Please find the attached WIP patch to allow the same name configuration
> > parameters with and without index postfix along with the integration of
> > all newly added health_check_* parameters.
> >
> >
> > To implement the same name parameter with and without index postfix is
> > that, The patch makes adds the following to the config framework.
> >
> > -- All the array type config (config_int_array, config_string_array
> > ...) parameters
> > can be configured to allow the setting of values with the same name but
> > with out providing the index.
> > -- This same named config parameter with and without index postfix must
> be
> > of same data type.
> > -- The indexed (array) parameters and the same name parameter without
> index
> > postfix can be made independent and also the index free one can be
> > entangled with array.
> > -- The new DEFAULT_FOR_NO_VALUE_ARRAY_VAR flag enables the index free
> value
> > of the array type record to serve as the default value for all indexes
> for
> > which the value is not provided
> > -- If the value for index free (same name parameter but without index
> > postfix) is updated in the session and DEFAULT_FOR_NO_VALUE_ARRAY_VAR
> flag
> > is set the value of all indexes which are not provided by user are also
> > updated for the session.
> >
> > Note that it is still a WIP patch, Although the functionality is complete
> > from my side but it needs little cleanup and also more testing, but I
> want
> > to share the early version with you to make sure the patch follows the
> > same philosophy as envisioned by you for the type of configuration
> > parameter.
> >
> >
> >
> > Thanks
> > Best regards
> > Muhammad Usama
> >
> >
> > On Wed, Apr 26, 2017 at 5:32 AM, Tatsuo Ishii <ishii at sraoss.co.jp>
> wrote:
> >
> >> > On Tue, Apr 25, 2017 at 7:24 PM, Tatsuo Ishii <ishii at sraoss.co.jp>
> >> wrote:
> >> >
> >> >> Hi Usama,
> >> >>
> >> >> > Hi Ishii-San
> >> >> >
> >> >> > I am working on config framework modification to allow same name
> >> >> parameters
> >> >> > with and without index postfix, I am almost done with the framework
> >> >> related
> >> >> > changes.
> >> >>
> >> >> Thanks!
> >> >>
> >> >> > And now for testing I need to add one such parameter and I was
> >> thinking
> >> >> > instead of using a dummy configuration variable for testing I would
> >> >> rather
> >> >> > add the *health_check_period* and *health_check_period[idx]* so
> that
> >> you
> >> >> > can also use it.
> >> >> > For that can you tell me where do you want to create
> >> health_check_period
> >> >> > variable for each backend? Is BackendInfo structure is the right
> >> place?
> >> >>
> >> >> I'm working on it for the part. I will push it tomorrow. BTW, unlike
> >> >> BackendInfo, the structure does not need to live on the shared
> memory.
> >> >>
> >> >
> >> > Sure thanks, And yes you are right the health_check_period doesn't
> needs
> >> > to go in shared memory,
> >> >
> >> > You can just push the structure related changes for the
> >> health_check_period
> >> > parameters and I will make it configurable, that way it will save you
> the
> >> > time and also I will be able to test the changes before pushing the
> >> changes.
> >>
> >> Thanks. I have just pushed chages to add the data structure along with
> >> sample configuration files changes.
> >>
> >> https://git.postgresql.org/gitweb/?p=pgpool2.git;a=commit;h=
> >> c0d209d76c67fe10690c33d0a982c0fb3b919544
> >>
> >> Best regards,
> >> --
> >> Tatsuo Ishii
> >> SRA OSS, Inc. Japan
> >> English: http://www.sraoss.co.jp/index_en.php
> >> Japanese:http://www.sraoss.co.jp
> >>
> >> >> > Thanks
> >> >> > Best Regards
> >> >> >
> >> >> >
> >> >> > On Mon, Apr 24, 2017 at 7:42 AM, Tatsuo Ishii <ishii at sraoss.co.jp>
> >> >> wrote:
> >> >> >
> >> >> >> >> On 21-Apr-2017, at 4:31 AM, Tatsuo Ishii <ishii at sraoss.co.jp>
> >> wrote:
> >> >> >> >>
> >> >> >> >> Usama,
> >> >> >> >>
> >> >> >> >> Is it possible to have following config parameter at the same
> >> time?
> >> >> >> >> My feeling is we can't because current implementation of config
> >> >> >> >> handling does not allow it.
> >> >> >> >>
> >> >> >> >> health_check_period = 10
> >> >> >> >> health_check_period0 = 5
> >> >> >> >
> >> >> >> > Yes, having the same named configuration parameter with and
> without
> >> >> >> index postfix would cause problem with the current
> implementations,
> >> but
> >> >> if
> >> >> >> we want to support this I can tweak the configuration framework to
> >> allow
> >> >> >> that.
> >> >> >>
> >> >> >> That would be desirable.
> >> >> >>
> >> >> >> Best regards,
> >> >> >> --
> >> >> >> Tatsuo Ishii
> >> >> >> SRA OSS, Inc. Japan
> >> >> >> English: http://www.sraoss.co.jp/index_en.php
> >> >> >> Japanese:http://www.sraoss.co.jp
> >> >> >>
> >> >> >> > Thanks
> >> >> >> > Best regards
> >> >> >> > Muhammad Usama
> >> >> >> >
> >> >> >> >>
> >> >> >> >> Best regards,
> >> >> >> >> --
> >> >> >> >> Tatsuo Ishii
> >> >> >> >> SRA OSS, Inc. Japan
> >> >> >> >> English: http://www.sraoss.co.jp/index_en.php
> >> >> >> >> Japanese:http://www.sraoss.co.jp
> >> >> >> >>
> >> >> >> >>> Hi,
> >> >> >> >>>
> >> >> >> >>> This is a Request for Comments on the new implementation of
> >> health
> >> >> >> >>> check aiming for Pgpool-II 3.7.
> >> >> >> >>>
> >> >> >> >>> Problems:
> >> >> >> >>>
> >> >> >> >>> Current implementation of health check is a single serial
> >> processing
> >> >> >> >>> for all of database nodes. This implies some limitations for
> >> health
> >> >> >> >>> check process: 1) it is not possible to specify different
> health
> >> >> check
> >> >> >> >>> configuration values for each database node, 2) node failure
> >> >> detection
> >> >> >> >>> may take longer. For example, if it takes 10 seconds before
> >> >> detecting
> >> >> >> >>> node 0 failure, then detecting node 1 failure will be delayed
> at
> >> >> least
> >> >> >> >>> 10 seconds because it starts node failure detection after
> node 0.
> >> >> >> >>>
> >> >> >> >>> The solution:
> >> >> >> >>>
> >> >> >> >>> Allow to specify health check parameters for each node.
> >> Pgpool.conf
> >> >> >> >>> will look like:
> >> >> >> >>>
> >> >> >> >>> health_check_period0 = 10
> >> >> >> >>> health_check_timeout0 = 20
> >> >> >> >>> :
> >> >> >> >>> :
> >> >> >> >>>
> >> >> >> >>> where "0" means database node 0 (similar concept as
> "backend_*0
> >> >> >> >>> parameters).
> >> >> >> >>>
> >> >> >> >>> To make admin's life easier, current parameters can be used as
> >> >> >> >>> well. Suppose there are 3 nodes, and we have:
> >> >> >> >>>
> >> >> >> >>> health_check_period = 10
> >> >> >> >>> health_check_period0 = 5
> >> >> >> >>>
> >> >> >> >>> then health_check_period for node 1 and 2 will be 10, while
> >> >> >> >>> health_check_period for node 0 will be 5. So parameter names
> >> without
> >> >> >> >>> node id works as a "global variable".
> >> >> >> >>>
> >> >> >> >>> The implementation:
> >> >> >> >>>
> >> >> >> >>> Create separate child process of pgpool main process and let
> do
> >> the
> >> >> >> >>> heal check job for each database node. Once the health check
> >> child
> >> >> >> >>> process detects node failure, it signals to main process and
> main
> >> >> >> >>> process will perform failover.
> >> >> >> >>>
> >> >> >> >>> This architecture makes pgpool main process simpler and
> robust,
> >> >> while
> >> >> >> >>> earlier detection of node failure by the health check child
> >> process.
> >> >> >> >>>
> >> >> >> >>> Comments and suggestions are welcome.
> >> >> >> >>>
> >> >> >> >>> Best regards,
> >> >> >> >>> --
> >> >> >> >>> Tatsuo Ishii
> >> >> >> >>> SRA OSS, Inc. Japan
> >> >> >> >>> English: http://www.sraoss.co.jp/index_en.php
> >> >> >> >>> Japanese:http://www.sraoss.co.jp
> >> >> >> >>> _______________________________________________
> >> >> >> >>> pgpool-hackers mailing list
> >> >> >> >>> pgpool-hackers at pgpool.net
> >> >> >> >>> http://www.pgpool.net/mailman/listinfo/pgpool-hackers
> >> >> >>
> >> >>
> >>
>
> # ----------------------------
> # 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 = 'localhost'
> # 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)
>
>
> # - 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)
> 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)
>
> # - Backend Connection Settings -
>
> backend_hostname0 = 'host1'
> # 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 = '/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
> #-----------------------------------------------------------
> -------------------
>
> # - 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 = 'stderr'
> # Where to log
> # Valid values are combinations of
> stderr,
> # and syslog. Default to stderr.
>
> # - What to log -
>
> log_line_prefix = '%t: pid %p: ' # printf-style string to output at
> beginning of each log line.
>
> 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 = 'if_over_threshold'
> # 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
>
> #log_error_verbosity = default # terse, default, or verbose
> messages
>
> #client_min_messages = notice # values in order of decreasing
> detail:
> # debug5
> # debug4
> # debug3
> # debug2
> # debug1
> # log
> # notice
> # warning
> # error
>
> #log_min_messages = warning # 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 = off
> # 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 = off
> # 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 = 'currval,lastval,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 = on
> # Activate master/slave mode
> # (change requires restart)
> master_slave_sub_mode = 'stream'
> # Master/slave sub mode
> # Valid values are combinations slony or
> # stream. Default is slony.
> # (change requires restart)
>
> # - Streaming -
>
> sr_check_period = 10
> # 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 = 10000000
> # 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 = 'nobody'
> # Health check user
> health_check_password = ''
> # Password for health check user
> health_check_database = ''
> # 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 = 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 = 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)
> 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.
>
> 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
> sr_check_user = 't-ishii'
> recovery_user = 't-ishii'
> recovery_password = ''
> recovery_1st_stage_command = 'basebackup.sh'
> health_check_period = 10
> health_check_user = 't-ishii'
> memqcache_oiddir = '/home/t-ishii/work/pgpool-II/
> current/Bugs/bug301-memcache-segfault/testdir/log/pgpool/oiddir'
> log_per_node_statement = on
> failover_command = '/home/t-ishii/work/pgpool-II/
> current/Bugs/bug301-memcache-segfault/testdir/etc/failover.sh %d %h %p %D
> %m %M %H %P %r %R'
> socket_dir = '/tmp'
> pcp_socket_dir = '/tmp'
> port = 11000
> pcp_port = 11001
> pid_file_name = '/home/t-ishii/work/pgpool-II/
> current/Bugs/bug301-memcache-segfault/testdir/run/pgpool.pid'
> logdir = '/home/t-ishii/work/pgpool-II/current/Bugs/bug301-memcache-
> segfault/testdir/log'
> backend_hostname0 = '/tmp'
> backend_port0 = 11002
> backend_weight0 = 1
> backend_data_directory0 = '/home/t-ishii/work/pgpool-II/
> current/Bugs/bug301-memcache-segfault/testdir/data0'
> #backend_hostname1 = '/tmp'
> backend_hostname1 = '133.137.175.105'
> backend_port1 = 11003
> backend_weight1 = 1
> backend_data_directory1 = '/home/t-ishii/work/pgpool-II/
> current/Bugs/bug301-memcache-segfault/testdir/data1'
> follow_master_command = '/home/t-ishii/work/pgpool-II/
> current/Bugs/bug301-memcache-segfault/testdir/etc/follow_master.sh %d %h
> %p %D %m %M %H %P %r %R'
> memory_cache_enabled = on
> memqcache_method = 'memcached'
> health_check_max_retries = 3
> health_check_retry_delay = 1
> health_check_timeout = 5
> sr_check_period = 0
> log_error_verbosity = verbose
> health_check_period = 0
> health_check_max_retries1 = 1
>
>
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