[pgpool-general: 8105] Re: Problems taking node offline

[Bo Peng]

Hello,


> I want to take a backend node offline and having some trouble with it.
> 
> I check the status of my notes:
> template1=> show pool_nodes;
>  node_id |       hostname       | port | status | lb_weight |  role   | select_cnt | load_balance_node | replication_delay | replication_state | replication_sync_state | last_status_change  
> ---------+----------------------+------+--------+-----------+---------+------------+-------------------+-------------------+-------------------+------------------------+---------------------
>  0       | psql-01.mgmt.bbn.com | 5432 | up     | 0.333333  | standby | 646198     | false             | 0                 | streaming         | sync                   | 2022-04-25 14:19:57
>  1       | psql-02.mgmt.bbn.com | 5432 | up     | 0.333333  | primary | 2115353    | true              | 0                 |                   |                        | 2022-04-25 14:16:24
>  2       | psql-03.mgmt.bbn.com | 5432 | up     | 0.333333  | standby | 2913       | false             | 0                 | streaming         | potential              | 2022-04-25 14:24:25
> (3 rows)
> 
> I want to take psql-02 offline.
> 
> pcp_detach_node -h psql.mgmt.bbn.com -p 9897 -U pgpool -g -n 1
> Password: 
> pcp_detach_node -- Command Successful
> 
> 
> I check the status again:
> template1=> show pool_nodes;
>  node_id |       hostname       | port | status | lb_weight |  role   | select_cnt | load_balance_node | replication_delay | replication_state | replication_sync_state | last_status_change  
> ---------+----------------------+------+--------+-----------+---------+------------+-------------------+-------------------+-------------------+------------------------+---------------------
>  0       | psql-01.mgmt.bbn.com | 5432 | up     | 0.333333  | standby | 718555     | true              | 0                 | streaming         | sync                   | 2022-04-25 14:19:57
>  1       | psql-02.mgmt.bbn.com | 5432 | up     | 0.333333  | primary | 2373454    | false             | 0                 |                   |                        | 2022-04-25 14:16:24
>  2       | psql-03.mgmt.bbn.com | 5432 | up     | 0.333333  | standby | 3310       | false             | 0                 | streaming         | potential              | 2022-04-25 14:24:25
> (3 rows)
> 
> 
> I still see psql-02 online. Why is that?

Could you share pgpool.conf and full log after running pcp_detach_node?
Which version of Pgpool-II are you using? 

> Log messages during the pcp command:
> Apr 25 15:59:48 psql-02 pgpool[11672]: 2022-04-25 15:59:48: pid 11674: LOG:  new IPC connection received
> Apr 25 15:59:48 psql-02 pgpool[11672]: 2022-04-25 15:59:48: pid 11674: LOG:  online recovery request from local pgpool-II node received on IPC interface is forwarded to master watchdog node "psql-02.mgmt.bbn.com:9898 Linux psql-02"
> Apr 25 15:59:48 psql-02 pgpool[11672]: 2022-04-25 15:59:48: pid 11674: DETAIL:  waiting for the reply...
> Apr 25 15:59:48 psql-02 pgpool[11672]: 2022-04-25 15:59:48: pid 13736: LOG:  PCP process with pid: 20049 exit with SUCCESS.
> Apr 25 15:59:48 psql-02 pgpool[11672]: 2022-04-25 15:59:48: pid 13736: LOG:  PCP process with pid: 20049 exits with status 0
> 
> 
> Apr 25 15:59:54 psql-02 pgpool[11672]: 2022-04-25 15:59:54: pid 11672: LOG:  child process with pid: 19261 exits with status 256
> Apr 25 15:59:54 psql-02 pgpool[11672]: 2022-04-25 15:59:54: pid 11672: LOG:  fork a new child process with pid: 20176
> Apr 25 15:59:54 psql-02 pgpool[11672]: 2022-04-25 15:59:54: pid 11672: LOG:  child process with pid: 19006 exits with status 256
> Apr 25 15:59:54 psql-02 pgpool[11672]: 2022-04-25 15:59:54: pid 11672: LOG:  fork a new child process with pid: 20178
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Jon Schewe
> Principal Software Systems Technologist
> C: +1 612.263.2718
> O: +1 952.545.5720
> jon.schewe at raytheon.com
> 
> Raytheon BBN
> Raytheon Intelligence & Space
> 5775 Wayzata Blvd. Suite 630
> St. Louis Park, MN 55416
> _______________________________________________
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-- 
Bo Peng <pengbo at sraoss.co.jp>
SRA OSS, Inc. Japan
http://www.sraoss.co.jp/