Public bug reported: Currently the "_get_computes_for_cells" function in the host_manager of scheduler runs sequentially and this affects the performance in case of large deployments (running a lot of cells) :
https://github.com/openstack/nova/blob/stable/pike/nova/scheduler/host_manager.py#L601 So it would be nice to use the scatter_gather_all_cells function to do this operation in parallel. Also apart from the performance scaling point of view, in case connection to a particular cell fails, it would be nice to have sentinels returned which is done by the scatter_gather_all_cells. This helps when a cell is down. ** Affects: nova Importance: Undecided Assignee: Dan Smith (danms) Status: In Progress ** Tags: cells -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1746561 Title: Make host_manager use scatter-gather and ignore down cells Status in OpenStack Compute (nova): In Progress Bug description: Currently the "_get_computes_for_cells" function in the host_manager of scheduler runs sequentially and this affects the performance in case of large deployments (running a lot of cells) : https://github.com/openstack/nova/blob/stable/pike/nova/scheduler/host_manager.py#L601 So it would be nice to use the scatter_gather_all_cells function to do this operation in parallel. Also apart from the performance scaling point of view, in case connection to a particular cell fails, it would be nice to have sentinels returned which is done by the scatter_gather_all_cells. This helps when a cell is down. To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1746561/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp