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value is being served. Is it a bug or am I doing something wrong? This
happens with both cache backends (memcache and shmem but test logs are
from memcache backend)

Test setup is postgresql-9.4 and memcached 1.4.21 and pgpool-3.4.2. my
configs and logs from test are here

https://gist.github.com/dbalan/d635993a3e532a083751

Regards,
--------
DHANANJAY | Infrastructure Engineer
Plivo, Inc. 340 Pine St, San Francisco - 94104, USA
Web: www.plivo.com | Twitter: @plivo, @notmycommit
DHANANJAY | Infrastructure Engineer
Plivo, Inc. 340 Pine St, San Francisco - 94104, USA
Web: www.plivo.com | Twitter: @plivo, @notmycommit

Free Incoming SMS for All US Short Codes =E2=80=93 Get One Today!=EF=BB=BF




On Tue, Apr 21, 2015 at 12:33 PM, Dhananjay Balan <dhananjay at plivo.com> wro=
te:
> 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=3D> select comments from users where id=3D1;
>  comments
> ----------
>  boooo
> (1 row)
>
> # comes from cache
> mydb=3D> select comments from users where id=3D1;
>  comments
> ----------
>  boooo
> (1 row)
>
> # works
> mydb=3D> update users set comments=3D'hello' where id=3D1;
> UPDATE 1
> mydb=3D> select comments from users where id=3D1;
>  comments
> ----------
>  hello
> (1 row)
>
> # stale
> mydb=3D> update users set comments=3D'hello world' where id=3D1;
> UPDATE 1
> mydb=3D> select comments from users where id=3D1;
>  comments
> ----------
>  hello
> (1 row)
>
> # also stale
> mydb=3D> update users set comments=3D'booo' where id=3D1;
> UPDATE 1
> mydb=3D> select comments from users where id=3D1;
>  comments
> ----------
>  hello
> (1 row)
>
>
> From the second write onwards, the cache is not invalidated and stale
> value is being served. Is it a bug or am I doing something wrong? This
> happens with both cache backends (memcache and shmem but test logs are
> from memcache backend)
>
> Test setup is postgresql-9.4 and memcached 1.4.21 and pgpool-3.4.2. my
> configs and logs from test are here
>
> https://gist.github.com/dbalan/d635993a3e532a083751
>
> Regards,
> --------
> DHANANJAY | Infrastructure Engineer
> Plivo, Inc. 340 Pine St, San Francisco - 94104, USA
> Web: www.plivo.com | Twitter: @plivo, @notmycommit