[pgpool-general-jp: 1438] Re: num_init_childrenを増やすとfailoverに失敗する

[Tatsuo Ishii]

石井です。

具体的に「失敗」というのはどのような状態になるのでしょうか？
また、そのときのログを見せていただけますか？
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp

> はじめまして、川口と申します。
> 
> pgpool-IIでフェイルオーバの検証を行っています。
> 
> PostgreSQL2台でStreaming Replicationを構成し、
> そこへpgpool-II（こちらも2台体制）から接続しています。
> なお、「コネクションプーリング」「負荷分散」「watchdog」「フェイルオー
> バ」機能はすべてオンにしてあります。
> 
> フェイルオーバは、num_init_childrenがデフォルトの32だと成功するのですが、
> それを600に増やすと、成功したり失敗したりで安定しません。
> 
> 
> このような場合、pgpool.conf設定の何かのタイムアウト時間を伸ばすなどの
> 「勘所」のようなものはあるのでしょうか？
> 
> どなたかご存知の方がいらっしゃれば、お手数ですがお教えください。
> よろしくお願いします。
> 
> 
> ●構成
> OSは全てCentOS 7.2
> pgpool-II : 3.5.4
> PostgreSQL : 9.5.1
> 
> マシンは全て仮想マシンで、
> PostgreSQL用×2、pgpool用×2の計4台
> 
> 
> ●設定ファイル(pgpool.conf)
> 
> #------------
> # CONNECTIONS
> #------------
> 
> listen_addresses = '*'
> port = 9999
> socket_dir = '(path)'
> listen_backlog_multiplier = 2
> serialize_accept = off
> pcp_listen_addresses = '*'
> pcp_port = 9898
> pcp_socket_dir = '(path)'
> backend_hostname0 = 'db-server1'
> backend_port0 = 5432
> backend_weight0 = 1
> backend_data_directory0 = '(path)'
> backend_flag0 = 'ALLOW_TO_FAILOVER'
> backend_hostname1 = 'db-server2'
> backend_port1 = 5432
> backend_weight1 = 1
> backend_data_directory1 = '(path)'
> backend_flag1 = 'ALLOW_TO_FAILOVER'
> 
> enable_pool_hba = on
> pool_passwd = 'pool_passwd'
> authentication_timeout = 60
> 
> ssl = off
> #ssl_key = '(path)/server.key'
> #ssl_cert = '(path)/server.cert'
> #ssl_ca_cert = ''
> #ssl_ca_cert_dir = ''
> 
> #------
> # POOLS
> #------
> 
> num_init_children = 600
> max_pool = 1
> child_life_time = 300
> child_max_connections = 0
> connection_life_time = 0
> client_idle_limit = 0
> 
> #------
> # LOGS
> #------
> log_destination = 'syslog'
> log_line_prefix = '%t: pid %p: '
> log_connections = on
> log_hostname = off
> log_statement = off
> log_per_node_statement = off
> log_standby_delay = 'none'
> 
> syslog_facility = 'LOCAL0'
> syslog_ident = 'pgpool'
> 
> debug_level = 0
> log_error_verbosity = verbose
> #client_min_messages = notice
> log_min_messages = debug5
> 
> #---------------
> # FILE LOCATIONS
> #---------------
> pid_file_name = '(path)/pgpool.pid'
> logdir = '(path)/pgpool'
> 
> #-------------------
> # CONNECTION POOLING
> #-------------------
> connection_cache = on
> reset_query_list = 'ABORT; DISCARD ALL'
> #reset_query_list = 'ABORT; RESET ALL; SET SESSION AUTHORIZATION
> #DEFAULT'
> 
> #------------------
> # REPLICATION MODE
> #------------------
> replication_mode = off
> replicate_select = off
> insert_lock = on
> lobj_lock_table = ''
> 
> replication_stop_on_mismatch = off
> failover_if_affected_tuples_mismatch = off
> 
> #--------------------
> # LOAD BALANCING MODE
> #--------------------
> load_balance_mode = on
> ignore_leading_white_space = on
> white_function_list = ''
> black_function_list = 'nextval,setval,nextval,setval'
> 
> database_redirect_preference_list = ''
> app_name_redirect_preference_list = ''
> allow_sql_comments = off
> 
> #------------------
> # MASTER/SLAVE MODE
> #------------------
> master_slave_mode = on
> master_slave_sub_mode = 'stream'
> 
> sr_check_period = 5
> sr_check_user = 'user1'
> sr_check_password = 'password'
> sr_check_database = 'database1'
> delay_threshold = 10000
> 
> follow_master_command = ''
> 
> #-------------
> # HEALTH CHECK
> #-------------
> health_check_period = 5
> health_check_timeout = 20
> health_check_user = 'user1'
> health_check_password = 'password'
> health_check_database = ''
> health_check_max_retries = 0
> health_check_retry_delay = 1
> 
> connect_timeout = 10000
> 
> #----------------------
> # FAILOVER AND FAILBACK
> #----------------------
> failover_command = '(path)/failover.sh %H %R'
> failback_command = ''
> fail_over_on_backend_error = on
> search_primary_node_timeout = 10
> 
> #----------------
> # ONLINE RECOVERY
> #----------------
> 
> recovery_user = 'user1'
> recovery_password = 'password'
> recovery_1st_stage_command = ''
> recovery_2nd_stage_command = ''
> recovery_timeout = 90
> client_idle_limit_in_recovery = 0
> 
> #---------
> # WATCHDOG
> #---------
> 
> use_watchdog = on
> 
> trusted_servers = ''
> ping_path = '(path)'
> wd_hostname = 'pgpool-server1'
> wd_port = 9000
> wd_priority = 1
> wd_authkey = ''
> wd_ipc_socket_dir = '/tmp'
> 
> 
> delegate_IP = '172.16.XXX.XXX'
> if_cmd_path = '(path)'
> if_up_cmd = 'ip addr add $_IP_$/24 dev eth1 label eth1:0'
> if_down_cmd = 'ip addr del $_IP_$/24 dev eth1'
> arping_path = '(path)'
> arping_cmd = 'arping -U $_IP_$ -w 1 -I eth1'
> 
> clear_memqcache_on_escalation = on
> wd_escalation_command = ''
> wd_de_escalation_command = ''
> 
> 
> wd_monitoring_interfaces_list = ''
> wd_lifecheck_method = 'heartbeat'
> wd_interval = 10
> 
> wd_heartbeat_port = 9694
> wd_heartbeat_keepalive = 2
> wd_heartbeat_deadtime = 30
> heartbeat_destination0 = 'pgpool-server2'
> heartbeat_destination_port0 = 9694
> heartbeat_device0 = ''
> 
> wd_life_point = 3
> wd_lifecheck_query = 'SELECT 1'
> wd_lifecheck_dbname = 'template1'
> wd_lifecheck_user = 'nobody'
> wd_lifecheck_password = ''
> 
> other_pgpool_hostname0 = 'pgpool-server2'
> other_pgpool_port0 = 9999
> other_wd_port0 = 9000
> 
> #-------
> # OTHERS
> #-------
> relcache_expire = 0
> relcache_size = 256
> check_temp_table = on
> check_unlogged_table = on
> 
> #-----------------------------
> # IN MEMORY QUERY MEMORY CACHE
> #-----------------------------
> 
> memory_cache_enabled = off
> memqcache_method = 'shmem'
> memqcache_memcached_host = 'localhost'
> memqcache_memcached_port = 11211
> memqcache_total_size = 67108864
> memqcache_max_num_cache = 1000000
> memqcache_expire = 0
> memqcache_auto_cache_invalidation = on
> memqcache_maxcache = 409600
> memqcache_cache_block_size = 1048576
> memqcache_oiddir = '(path)/oiddir'
> white_memqcache_table_list = ''
> black_memqcache_table_list = ''
> 
> 
> 以上です。
> 
> 
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