[pgpool-general: 3054] PGPool connection dropped when using pg_detach

[James Sewell]

Hey all,

This is a seemingly a pretty bad problem which I uncovered as part of my
last post, so the start of the message will be similar.

I have two pgpool nodes which I am using a TCP load balancer to spread
between. I am using watchdog to synchronise PostgreSQL node information
between the two and an external HA solution (with ALLOW_TO_FAILOVER).

If I start both my pgpool nodes up I get the following initial state:

postgres=# show pool_nodes;
 node_id |  hostname   | port | status | lb_weight |  role
---------+-------------+------+--------+-----------+---------
 0       | 10.10.10.1   | 5432 | 2      | 0.500000  | standby
 1       | 10.10.10.2   | 5432 | 2      | 0.500000  | primary
(2 rows)

Now I open a PSQL connection and do the following:

postgres=# SELECT inet_server_addr();
 inet_server_addr
------------------
 10.10.10.2
(1 row)

This shows I am connected to the primary.

I can run this multiple times and I will always be connected to the
primary, as long as I don't close the psql session.

Then from another window I run the following command:

 pcp_detach_node 1 load_balancer 9898 postgres postgres 0

And in the same PSQL session run the command again:

postgres=# SELECT inet_server_addr();
SSL SYSCALL error: EOF detected
The connection to the server was lost. Attempting reset: Succeeded.

This is strange. Why has my master connection been severed?

James Sewell,
PostgreSQL Team Lead / Solutions Architect
______________________________________


 Level 2, 50 Queen St, Melbourne VIC 3000

*P *(+61) 3 8370 8000  *W* www.lisasoft.com  *F *(+61) 3 8370 8099

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