Ian wrote:
I do have one more question, but feel free to ignore it if I'm bugging you.
What is the point of the automatic failover php has by default?
If there is an error getting/adding to the memcached server, and it
fails over to another, wouldn't there be duplicates then? Because it
would be adding the same key to more than 1 server in the connection pool?
Well, yes, there would be two copies assuming the failed server is still
up and running. Usually, when we have hit this issue, a server has
died. Also, we don't cache anything more than a day and most things no
more than an hour. So, at worst, there are two copies out there for an
hour. If you have a system that is actively adding and deleting data
from memcached, this could be an issue. You could write a custom script
that connects to all servers and deletes the key on each server. If
your application can deal with a downed node, you can set
memcache.allow_failover in your php.ini to No.
--
Brian Moon
Senior Developer
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