Sean Dague's quote from the abandoned review [1]: > Booting an instance is expensive, and triggers io load, which may > increase failure rates of these booting. Doing in parallel is not > really guarunteed to be faster than serial, and in some situations > will actually be slower. > > So this isn't a simple bug fix. It's something which we really should > have a spec for. There definitely has to be a max number which > is < 200. It should also have some real world boot data to see how > this plays out in real world situations.
I'm closing it as "Opinion/Wishlist". If you decide to work on this consider using a blueprint [2] (with a spec [3]). I'll recommend to read [4] if not yet done. If there are any questions left, feel free to contact me (markus_z) in the IRC channel #openstack-nova References: [1] https://review.openstack.org/#/c/223572/ [2] https://blueprints.launchpad.net/nova/ [3] https://github.com/openstack/nova-specs [4] https://wiki.openstack.org/wiki/Blueprints ** Changed in: nova Status: In Progress => Opinion ** Changed in: nova Importance: Undecided => Wishlist ** Changed in: nova Assignee: Rui Chen (kiwik-chenrui) => (unassigned) -- 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/1496334 Title: Nova-compute launch slowly because lots of instances is init one by one Status in OpenStack Compute (nova): Opinion Bug description: 1. code base $ git log -1 commit b492942744e09276e3ba4dcf0196143c521a1662 Merge: 920abc9 9706454 Author: Jenkins <[email protected]> Date: Thu Sep 3 00:05:04 2015 +0000 Merge "Fix bodies on consolidate-console-api" 2. Reproduce steps: The issue happen on VMware driver, think about the following case: * 200 active instances run in one nova-compute host that map to one vCenter Cluster, batch delete all instances, all of them are in "deleting" task_state. * nova-compute process stop and restart when all instances are in "deleting" task_state. * nova-compute start to init 200 deleting instances one by one. The workflow of VMware driver is power-off instance, then wait task finish, then delete the instance. * After all the deleting instances are handled, nova-compute is set to "up" state, continue to work. step 3 will spend lots of time on serial init_instance. In my performance test environment, the nova-compute spend about 15 minutes to finish init_instance. In other drivers, like: libvirt, nova-compute manage less instances than VMware driver (maybe less than 50 instances), so these drivers have less chance to face the issue. To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1496334/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
