[pgpool-general: 8219] Re: Pgpool reporting inconsistent statuses

[Bo Peng]

Hello,

> Hi everybody,
> 
> I have managed to set up, from scratch, a postgresql 14 + pgpool 4.3.2 
> cluster, with streaming replication. I have also a simple test that 
> creates a database, a table on it, and adds some records, to then check 
> on all the members of the cluster if replication has been successful.
> 
> If I point my test to the primary node of the streaming replication 
> cluster, my test succeeds and all is OK.
> 
> When I set up everything through pgpool, all seems to work:
> 
>   node_id |  hostname  | port | status | pg_status | lb_weight |  role   
> | pg_role | select_cnt | load_balance_node | replication_delay | 
> replication_state | replication_sync_state | last_status_change
> ---------+------------+------+--------+-----------+-----------+---------+---------+------------+-------------------+-------------------+-------------------+------------------------+---------------------
>   0       | pgsql-0000 | 5433 | up     | up        | 0.333333  | primary 
> | primary | 0          | false             | 0                 |         
>            |                        | 2022-06-14 11:28:11
>   1       | pgsql-0001 | 5433 | up     | up        | 0.333333  | standby 
> | standby | 0          | false             | 0                 | 
> streaming         | async                  | 2022-06-14 11:28:11
>   2       | pgsql-0002 | 5433 | up     | up        | 0.333333  | standby 
> | standby | 0          | true              | 0                 | 
> streaming         | async                  | 2022-06-14 11:28:11
>
> If now run my test, this is what I get back:
> "DETAIL:  kind does not match between main(53) slot[1] (45)"

During you test, what queries were issued?
 
> I have found an article claiming this is a problem caused by the number 
> of connections. To this end, I have max_connections=40 in postgresql, 
> and num_init_children=7 and max_pool=5 in pgpool.conf. As 5*7 < 40, I 
> should ok on the side. Does anybody has a clue on what might be going 
> on, here?
> 
> Regards!
> 
> -- 
> Felix Rubio
> "Don't believe what you're told. Double check."
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-- 
Bo Peng <pengbo at sraoss.co.jp>
SRA OSS, Inc. Japan
https://www.sraoss.co.jp/