Alright. Once the failover is done successfully and the standby is promoted to new primary, I start the recovery of the old primary (5432).
The ol primary is getting recovered. But I found that pgpool is getting killed. Why? Here is the pgpool log: ...... 2011-04-19 11:23:42 LOG: pid 15894: send_failback_request: fail back 0 th node request from pid 15894 2011-04-19 11:23:42 DEBUG: pid 21977: s_do_auth: auth kind: 0 2011-04-19 11:23:42 ERROR: pid 21977: s_do_auth: unknown response "E" before processing BackendKeyData 2011-04-19 11:23:42 ERROR: pid 21977: s_do_auth: unknown response "^@" before processing BackendKeyData 2011-04-19 11:23:42 ERROR: pid 21977: s_do_auth: unknown response "^@" before processing BackendKeyData 2011-04-19 11:23:42 ERROR: pid 21977: s_do_auth: unknown response "^@" before processing BackendKeyData 2011-04-19 11:23:42 ERROR: pid 21977: s_do_auth: unknown response "V" before processing BackendKeyData 2011-04-19 11:23:42 DEBUG: pid 21977: s_do_auth: parameter status data received 2011-04-19 11:23:42 ERROR: pid 21977: pool_read2: failed to realloc 2011-04-19 11:23:42 DEBUG: pid 15861: failover_handler called 2011-04-19 11:23:42 DEBUG: pid 15861: failover_handler: starting to select new master node 2011-04-19 11:23:42 LOG: pid 15861: starting fail back. reconnect host localhost(5432) 2011-04-19 11:23:42 LOG: pid 15861: execute command: touch /home/sandeep/PostgreSQL9.0/inst/bin/../failback.log 2011-04-19 11:23:42 DEBUG: pid 20267: child received shutdown request signal 3 2011-04-19 11:23:42 DEBUG: pid 15861: failover_handler: kill 20267 2011-04-19 11:23:42 DEBUG: pid 15861: failover_handler: kill 20268 2011-04-19 11:23:42 DEBUG: pid 15861: failover_handler: kill 20269 2011-04-19 11:23:42 DEBUG: pid 20268: child received shutdown request signal 3 2011-04-19 11:23:42 DEBUG: pid 20270: child received shutdown request signal 3 ..... 2011-04-19 11:23:42 LOG: pid 15861: failover_handler: set new master node: 0 2011-04-19 11:23:42 DEBUG: pid 22011: I am 22011 2011-04-19 11:23:42 LOG: pid 15861: failback done. reconnect host localhost(5432) My command to start recovery is: pcp_recovery_node -d 20 localhost 9898 pg pg 0 The other thing I noticed is that the above command does not return, I have to press Control-C, to get the prompt back. I'm working on CentOS 64bit. Thanks for your help. ________________________________ From: Sandeep Thakkar <[email protected]> To: Sandeep Thakkar <[email protected]>; [email protected] Sent: Thu, April 14, 2011 3:28:34 PM Subject: Re: [Pgpool-general] failover done, now need help in online recovery Can we bring the primary server up again? I found in the doc that "In master/slave mode with streaming replication, online recovery can be performed. Only a standby node can be recovered. You cannot recover the primary node. To recover the primary node, you have to stop all DB nodes and pgpool-II, and then restore it from a backup." So, can't we restore the primary without making the standby (new primary) down? Thanks. ________________________________ From: Sandeep Thakkar <[email protected]> To: [email protected] Sent: Wed, April 13, 2011 3:05:25 PM Subject: [Pgpool-general] failover done, now need help in online recovery Hi, Failover: I have one Master (PG9.0), one Standby (PG9.0) and one instance of pgpool-II (3.0.3) on the same box. I created a recovery.conf in the Standby and did all the other required settings in pgool.conf and postgresql.conf. To mimic the failover scenario, I killed the Master server, and found that failover process started successfully. Standby stops in recovering mode, and is promoted to primary (read-write). I could even execute write query on Standby (new Primary) now. Online recovery: To take it forward, I want to bring my old primary up and once up, it should behave as a Standby (read only). One step I know of is to execute the basebackup.sh on the new Primary, which will copy it's base directory to the old primary's data directory. Then what? I do not have the recovery.conf on the old primary yet. Do I need to keep it there? What else do I need to do? Thanks
_______________________________________________ Pgpool-general mailing list [email protected] http://pgfoundry.org/mailman/listinfo/pgpool-general
