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in the LAST_VERSION global.\n\nThere are 30+ API controller classes that construct an\ninstance of nova.compute.api.API which itself constructs\na nova.compute.rpcapi.ComputeAPI object which determines\nthe version cap as described above, and that is per API\nworker. Each cell DB call goes through RequestContext.set_target_cell\nwhich has a lock in it, so in this scenario on start of\nnova-api there can be a lot of locking log messages for\nget_or_set_cached_cell_and_set_connections.\n\nThe RPC API ClientRouter can be a singleton and just constructed\non first access to avoid the redundant database queries which\nis what this change does.\n\nTo preserve the LAST_VERSION re-calculation that was in\nComputeManager.reset(), we have to also reset the _ROUTER global\nso ComputeManager.reset() now resets all of the compute RPC API\nglobals.\n\nChange-Id: I48109d5e32a2e9635c240da1c77f7f6cc7e3c76d\nRelated-Bug: #1807219\nRelated-Bug: #1815697\n(cherry picked from commit ae659668b5679cf7223474193d3b9a584dd3f016)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/7d54f91e9f5782413807b284a77b3f34f5551fa0"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/7d54f91e9f5782413807b284a77b3f34f5551fa0"}]},"branch":"refs/heads/stable/stein"}},"requirements":[],"submit_records":[],"submit_requirements":[]}