Cache connection pools
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Key: CAROB-132
URL: https://forge.continuent.org/jira/browse/CAROB-132
Project: Carob
Type: New Feature
Components: C++ API
Versions: Carob 0.7.2
Reporter: Gilles Rayrat
Assigned to: Gilles Rayrat
Priority: Critical
Fix For: Carob 0.7.3
When deleting a connection, if no more connection parameters point to a
controller pool, this pool is deleted
Thus, creating a new connection with same settings will create a new pool,
which will *not* remember which controller the last connection was connected to.
This is a problem for php, which deletes connections after each request. 2
subsequent request will then hit the same controller, without load balancing
The solution is to cache the controller pools for a couple of seconds before
deleting it. This will lead to small memory leaks at the end of the process
(the last controller pool never being freed), which is not a problem as the
process is exiting (thus freeing its memory)
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