[UPHPU] load balanced file-based sessions
jon at jenseng.com
Tue May 6 11:53:51 MDT 2008
D'oh, Lonnie beat me.
If you want to know more about why NFS can suck, this paper is a good read:
> Are there any big websites that use file-based sessions or are they all
> database-drive with huge clusters? We are using a database for sessions
> currently but it cannot keep up and brings the site to it's knees.
Mozy uses database sessions and they work quite well. Some things you
may want to consider:
1. Modify your session handler so that it only reads/writes the
session data as needed. In other words, if your session data doesn't get
updated in a given request, don't serialize it. And if a given request
isn't going to need any session data, don't read it.
2. Make sure you are using persistent db connections! If every request
opens and closes a new db handle, then you are in for a world of hurt.
3. Consider making your session table in-memory only. This should
speed things up.
4. Minimize what you store in the session to things that you really
need from page to page (e.g. $user_id).
> The last option I was considering was storing the session in a cookie as
> an encrypted, serialized array. What are the groups thoughts on this?
Not a bad approach either, just be sure to follow #4 above to minimize
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