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Using sql as default driver for tokens
kvs driver for tokens is not a production quality storage method. The shortcomings of using kvs as storage driver for tokens: 1. It requires load balancer to persist connections to a single keystone server by token. 2. The memory will grow out of control until token_flush is run. 3. At some point kvs lookups get very slow because there are millions of keys in the dict. 4. Process restart invalidates all tokens. Fixes: bug #1188370 Change-Id: Ic726e12d798b843412158a7b92f5e3e3a654811f
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