I have been playing around with Apache::Session and had it working with
MySQL -- then decided to switch to Memcached
It seemed to be working but would randomly fail during my testing and the
session ID would start rotating around -- if I reloaded the page over and
over it would keep the same ID, then randomly change it and I could not
figure out why. After some testing I found the following:
If I telnet to the memcached port and type "stats" to see the statistics, I
see that curr_connections is high and stays that way -- I believe this is
due to mod_perl keeping the connections open for each process. I removed
the "Apache::DBI" library option to make sure that was not causing
persistant connections, but the curr_connections continued to stay high
after many reloads of a webpage.
It seems the failures occur after i kill and restart the memcached daemon,
but not restart Apache. I am guessing that the connections to memcached are
staying persistant with each apache child, and then when i restart memcached
they become invalid and fail, causing the session ID's to rotate.
Does anyone have a solution to this? I was originally doing this:
autohandler
===
<%init>
### this was a library routine i had in a "use" that tied to a "my" hash and
returned \%session
my $session = getSession ();
</%init>
=====
Next i tried adding to autohandler:
=====
<%cleanup>
untie %$session
undef $session
</%cleanup>
=======
That did not stop the curr_connection problem. I also tried putting the
getSession code directly into %init, and also used local * as in the mason
book.
I am now using this line in Apache/http.conf
PerlSetVar MasonAllowGlobals %session
to make it global, merely to make it easier to pass this data around (as
suggested in the mason book)... it seems to be working but i still get that
failure if memcached is restarted without restarting apache.
The mason book mentions something about local * and how it is necessary for
closing the connection when done, but I have had no luck. Any thoughts? A
working example would be helpful.
Oh one other question -- anyone know how to detect a failure to connect to
memcached?... it seems that if memcached is not up, that it just returns the
error that the object does not exist, rather than a connection failure
error?
Thanks
-John
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