[pgpool-general: 3648] Re: Error in pgpool memory cache invalidation.

[Dhananjay Balan]

Looks like only part of this email ended up in the mailing list , not
sure how. Resending again - hope it works this time.

pgpool doesn't seem to be invalidating caches properly. See the
example test case below

psql -U ruser -d mydb -h 127.0.0.1 -p 9999
Password for user ruser:
psql (9.4.1)
Type "help" for help.

mydb=> select comments from users where id=1;
 comments
----------
 boooo
(1 row)

# comes from cache
mydb=> select comments from users where id=1;
 comments
----------
 boooo
(1 row)

# works
mydb=> update users set comments='hello' where id=1;
UPDATE 1
mydb=> select comments from users where id=1;
 comments
----------
 hello
(1 row)

# stale
mydb=> update users set comments='hello world' where id=1;
UPDATE 1
mydb=> select comments from users where id=1;
 comments
----------
 hello
(1 row)

# also stale
mydb=> update users set comments='booo' where id=1;
UPDATE 1
mydb=> select comments from users where id=1;
 comments
----------
 hello
(1 row)