[pgpool-general: 3334] Re: Pgpool and backup by PITR

Tatsuo Ishii ishii at postgresql.org
Wed Dec 3 20:11:07 JST 2014 

What does "show pool_nodes" show?

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

> Hi Tatsuo,
> 
> this tutorial i tried before using replication mode. But there is one
> problem i can't figure.
> 
> I have master and slave server but only master is accepting my queries. If
> i try to create new db by:
> createdb -p 9999 -U postgres -h localhost DB5
> on pgpool-II server, i get info below from log but only master create this
> DB5. If i try to connect by pgpool-II to this new db, i get another info
> below.
> 
> Is there anything i am doing wrong?
> 
> PS:
> both are hot_standby and use configuration from manual, only pg_hba.conf is
> set to specific hosts for trust reading all databases from postgres and
> also trust replication
> 
> Thanks,
> Michal Stava
> 
> LOG when connecting new DB:
> 2014-12-03 08:55:28: pid 21237: LOG:  pool_read_kind: error message from
> 1 th backend:database "DB5" does not exist
> 2014-12-03 08:55:28: pid 21237: ERROR:  unable to read message kind
> 2014-12-03 08:55:28: pid 21237: DETAIL:  kind does not match between
> master(53) slot[1] (45)
> 
> LOG when creating new DB:
> 2014-12-03 08:51:03: pid 21153: DEBUG:  I am 21153 accept fd 11
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading startup packet
> 2014-12-03 08:51:03: pid 21153: DETAIL:  Protocol Major: 1234 Minor: 5679
> database:  user:
> 2014-12-03 08:51:03: pid 21153: DEBUG:  selecting backend connection
> 2014-12-03 08:51:03: pid 21153: DETAIL:  SSLRequest from client
> 2014-12-03 08:51:03: pid 21153: DEBUG:  SSL is requested but SSL support is
> not available
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading startup packet
> 2014-12-03 08:51:03: pid 21153: DETAIL:  application_name: createdb
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading startup packet
> 2014-12-03 08:51:03: pid 21153: DETAIL:  Protocol Major: 3 Minor: 0
> database: postgres user: postgres
> 2014-12-03 08:51:03: pid 21153: DEBUG:  sending backend key data
> 2014-12-03 08:51:03: pid 21153: DETAIL:  send pid 15378 to frontend
> 2014-12-03 08:51:03: pid 21153: DEBUG:  do_command: Query:"SET
> application_name TO 'createdb'"
> 2014-12-03 08:51:03: pid 21153: DEBUG:  waiting for query response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  waiting for backend:0 to complete
> the query
> 2014-12-03 08:51:03: pid 21153: DEBUG:  detect error: kind: S
> 2014-12-03 08:51:03: pid 21153: DEBUG:  do_command: kind: 'S'
> 2014-12-03 08:51:03: pid 21153: DEBUG:  do_command: kind: 'C'
> 2014-12-03 08:51:03: pid 21153: DEBUG:  do_command: kind: 'Z'
> 2014-12-03 08:51:03: pid 21153: DEBUG:  do_command: Query:"SET
> application_name TO 'createdb'"
> 2014-12-03 08:51:03: pid 21153: DEBUG:  waiting for query response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  waiting for backend:1 to complete
> the query
> 2014-12-03 08:51:03: pid 21153: DEBUG:  detect error: kind: S
> 2014-12-03 08:51:03: pid 21153: DEBUG:  do_command: kind: 'S'
> 2014-12-03 08:51:03: pid 21153: DEBUG:  do_command: kind: 'C'
> 2014-12-03 08:51:03: pid 21153: DEBUG:  do_command: kind: 'Z'
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: clearing
> transaction isolation. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: clearing writing
> transaction. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: clearing failed
> transaction. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: clearing failed
> transaction. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: clearing skip
> reading from backends. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: clearing ignore
> till sync. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  processing frontend response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  received kind 'Q'(51) from frontend
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: clearing doing
> extended query messaging. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: setting query in
> progress. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  decide where to send the queries
> 2014-12-03 08:51:03: pid 21153: DETAIL:  destination = 0 for query= "CREATE
> DATABASE "DB5";
>     "
> 2014-12-03 08:51:03: pid 21153: DEBUG:  waiting for query response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  waiting for backend:0 to complete
> the query
> 2014-12-03 08:51:03: pid 21153: DEBUG:  detect error: kind: C
> 2014-12-03 08:51:03: pid 21153: DEBUG:  detect error: kind: C
> 2014-12-03 08:51:03: pid 21153: DEBUG:  detect error: kind: C
> 2014-12-03 08:51:03: pid 21153: DEBUG:  detect error: kind: C
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading backend data packet kind
> 2014-12-03 08:51:03: pid 21153: DETAIL:  backend:0 of 2 kind = 'C'
> 2014-12-03 08:51:03: pid 21153: DEBUG:  processing backend response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  received kind 'C'(43) from backend
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: setting command
> success. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading backend data packet kind
> 2014-12-03 08:51:03: pid 21153: DETAIL:  backend:0 of 2 kind = 'Z'
> 2014-12-03 08:51:03: pid 21153: DEBUG:  processing backend response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  received kind 'Z'(5a) from backend
> 2014-12-03 08:51:03: pid 21153: DEBUG:  processing backend response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  Ready For Query received
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading message length
> 2014-12-03 08:51:03: pid 21153: DETAIL:  slot: 0 length: 5
> 2014-12-03 08:51:03: pid 21153: DEBUG:  processing ReadyForQuery
> 2014-12-03 08:51:03: pid 21153: DETAIL:  transaction state 'I'(49)
> 2014-12-03 08:51:03: pid 21153: DEBUG:  processing frontend response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  received kind 'X'(58) from frontend
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: clearing doing
> extended query messaging. DONE
> 2014-12-03 08:51:03: pid 21153: LOG:  Frontend terminated
> 2014-12-03 08:51:03: pid 21153: DETAIL:  received message kind 'X' from
> frontend
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: setting query in
> progress. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  decide where to send the queries
> 2014-12-03 08:51:03: pid 21153: DETAIL:  destination = 3 for query= "
> DISCARD ALL"
> 2014-12-03 08:51:03: pid 21153: DEBUG:  waiting for query response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  waiting for backend:0 to complete
> the query
> 2014-12-03 08:51:03: pid 21153: DEBUG:  detect error: kind: S
> 2014-12-03 08:51:03: pid 21153: DEBUG:  detect error: kind: S
> 2014-12-03 08:51:03: pid 21153: DEBUG:  detect error: kind: S
> 2014-12-03 08:51:03: pid 21153: DEBUG:  detect error: kind: S
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading backend data packet kind
> 2014-12-03 08:51:03: pid 21153: DETAIL:  parameter name: is_superuser
> value: "on"
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading backend data packet kind
> 2014-12-03 08:51:03: pid 21153: DETAIL:  parameter name:
> session_authorization value: "postgres"
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading backend data packet kind
> 2014-12-03 08:51:03: pid 21153: DETAIL:  parameter name: application_name
> value: "createdb"
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading backend data packet kind
> 2014-12-03 08:51:03: pid 21153: DETAIL:  backend:0 of 2 kind = 'C'
> 2014-12-03 08:51:03: pid 21153: DEBUG:  processing backend response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  received kind 'C'(43) from backend
> 2014-12-03 08:51:03: pid 21153: DEBUG:  session context: setting command
> success. DONE
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading backend data packet kind
> 2014-12-03 08:51:03: pid 21153: DETAIL:  backend:0 of 2 kind = 'Z'
> 2014-12-03 08:51:03: pid 21153: DEBUG:  processing backend response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  received kind 'Z'(5a) from backend
> 2014-12-03 08:51:03: pid 21153: DEBUG:  processing backend response
> 2014-12-03 08:51:03: pid 21153: DETAIL:  Ready For Query received
> 2014-12-03 08:51:03: pid 21153: DEBUG:  reading message length
> 2014-12-03 08:51:03: pid 21153: DETAIL:  slot: 0 length: 5
> 2014-12-03 08:51:03: pid 21153: DEBUG:  processing ReadyForQuery
> 2014-12-03 08:51:03: pid 21153: DETAIL:  transaction state 'I'(49)
> 2014-12-03 08:51:03: pid 21153: DEBUG:  setting backend connection close
> timer
> 2014-12-03 08:51:03: pid 21153: DETAIL:  close time 1417593063
> 
> 2014-12-03 0:05 GMT+01:00 Tatsuo Ishii <ishii at postgresql.org>:
> 
>> > Hi,
>> >
>> > frstly I want to say "Good job, your technology is really good, thank
>> you."
>> > and secondly "Sorry for my bad english, I do my best."
>> >
>> > Ok, so what's my problem:
>> >
>> > I created replication model for my application (1 server with pgpool2
>> > instance and 2 servers like host0 and host1). Everything is ok except
>> > online_recovery part which I really have problem to understand.
>> >
>> > For now I have 3 empty scripts so adding node works, but there is no
>> > sychronization of DBs:
>> > basebackup
>> > pgpool_recovery_pitr
>> > pgpool_remote_start
>> >
>> >
>> > There is a sample of basebackup script:
>> >
>> > #! /bin/sh
>> > DATA=$1
>> > RECOVERY_TARGET=$2
>> > RECOVERY_DATA=$3
>> > psql -c "select pg_start_backup('pgpool-recovery')"
>> > postgres echo "restore_command = 'scp $HOSTNAME:/data/archive_log/%f
>> > %p'" > /data/recovery.conf
>> > tar -C /data -zcf pgsql.tar.gz pgsql
>> > psql -c 'select pg_stop_backup()' postgres
>> > scp pgsql.tar.gz $RECOVERY_TARGET:$RECOVERY_DATA
>> >
>> > I really need some advices there, because can't understand it.
>> >
>> > 1] there is something like /data/ so its $DATA or its other data?
>> > 2] there is tar on pgsql in data directory, but i have no pgsql directory
>> > there
>> > 3] do you have some working example? not only common sample?
>> > 4] very similar problem I have with other two scripts
>> >
>> > Last 2 days I spent many hours by trying to understand this online
>> recovery
>> > mechanism, but
>> > my karma is probably too low.
>> >
>> > Thank you for any advice,
>> > Michal Stava,
>> > CZECH REPUBLIC
>>
>> I recommend to start with this tutorial:
>>
>>
>> http://www.pgpool.net/pgpool-web/contrib_docs/simple_sr_setting2_3.3/index.html
>>
>> Best regards,
>> --
>> Tatsuo Ishii
>> SRA OSS, Inc. Japan
>> English: http://www.sraoss.co.jp/index_en.php
>> Japanese:http://www.sraoss.co.jp
>>

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