sphoid

I forgot to come back and resolve this but it turns out the problem was an incompatibility or bug in the memcached daemon. Upgrading to the latest version resolved our issues with our object cache getting corrupted. I Also downgraded the php-memcache to a stable version before that which improved things substantially.

We haven’t fully solved this but we have narrowed it down considerably. The symptom is intermittently calls to get_option(‘siteurl’) return nothing instead of the value that’s in the database. This causes functions that build urls to go completely haywire obviously. We’ve narrowed it down to a condition in the mysql server where queries are not returning in a timely manner resulting in corrupt data being returned by get_option which in turn gets cached and causes all hell to break loose until we flush the cache.