[Bug 968843] Re: [SRU] connection leak in rpc connection pool

[Chuck Short]

** Impact **

In nova, when exception occurs in MulticallWaiter scheduler the
scheduler wont put the connection back to the pool, preventing Nova from
running properly

** Development Fix **

This has been addressed in https://review.openstack.org/6804 and fixed
in quantal.

** Stable Fix **

This has been addressed in https://review.openstack.org/6833

** Test Case **

set small pool size, rpc_conn_pool_size=1
cause rpc response timeout ("Timed out waiting for RPC response" in log)
then when rpc.call next time, it will wait forever to get connection from pool

** Regression Potental **

Minimal this is an edge corner case.

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https://bugs.launchpad.net/bugs/968843

Title:
  [SRU] connection leak in rpc connection pool

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