In my keystone logs I get multiple messages like

"<188>Nov  4 14:51:32 node-4 keystone-keystone.common.kvs.core WARNING: KVS lock released (timeout reached) for: usertokens-ce84e2ed0dc84cf4b582482fcc3e14d0".

All records concern the single user who is admin.

Keystone in running on multiple nodes, and the version of Openstack is Icehouse.

I know that these log warnings mean that there are lots of lock releases of the admin user token by timeout.

So the my question is why these lock releases by timeout occur?

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