Cache persistence on domain name

First of all I would like to THANK YOU for getting this iRule together. However, I have a few questions about the hash and the persistence.

 

Based on the rule, it creates a unique key (using crc32) based on the host/uri and then persists on key. The default persist time is 180 seconds. Don't you think this would create a lot of persist records since the number of unique host/uri combinations are almost endless?

 

Based on the hash, will the BigIP always send it to the same member? For example, if a client requests and HTTP page and based on the hash the BigIP sends it to member cache-1 and then 10 minutes later another client requests the same page, will the BigIP hash and send the request back to memeber cache-1 even if the persist record is no longer there?

 

I also see that you can get the pool member that the hash would send the request to (set cache_mbr [persist lookup hash $key node]), is it possible to just send the request directly to the member and not worry about the persistence?