Meetings/NovaCellsv2

Weekly OpenStack Nova Cells v2 Meeting

This is a weekly meeting to discuss the Nova Cells v2 effort. It's intended as a forum for:

• People to keep up with what work is going on with the Nova Cells v2 and where it is headed
• Helping coordinate ongoing development work
• Wiki page for Cell v2

Meetings

• We removed the weekly meeting from openstack meetings because we canceled it far more often than we held it: https://review.openstack.org/609496
• Please find us in the #openstack-nova channel on IRC to talk about cells v2.

Next Meeting

Agenda

Please feel free to add items to the Agenda

• Bugs
  • #link https://bugs.launchpad.net/nova/+bug/1742649 map_instances default batch size is too small.
    • Docs were updated, otherwise this is low priority / opinion.
  • #link https://bugs.launchpad.net/nova/+bug/1749734 Purge comp_node and res_prvdr records during deletion of cells/hosts (tssurya)
    • https://review.openstack.org/#/c/546660/ - needs review
  • #link https://bugs.launchpad.net/nova/+bug/1719487 nova-manage db archive_deleted_rows is not multi-cell aware (Kevin_Zheng)
    • https://review.openstack.org/#/c/507486/ - needs review
  • Has been around for a long time now : Make nova-manage syncing all cells databases (licanwei)
    • https://review.openstack.org/#/c/519275/ - no updates since May 11
  • #link https://bugs.launchpad.net/nova/+bug/1757472 Required to define database/connection when running services for nova_api cell (mriedem)
    • Recreate in devstack: https://review.openstack.org/#/c/555346/
  • #link https://bugs.launchpad.net/nova/+bug/1778515 nova-manage list_cells doesn't work is some special characters are in the passwords (tssurya)
  • #link https://bugs.launchpad.net/nova/+bug/1781300 resize reschedule results in CantStartEngineError during up-call to InstanceMappings table (mriedem)
    • https://review.openstack.org/#/c/581912/ - needs to be backported to queens and pike
  • #link https://bugs.launchpad.net/nova/+bug/1781286 CantStartEngineError in cell conductor during reschedule - get_host_availability_zone up-call
  • #link https://bugs.launchpad.net/nova/+bug/1781421 CantStartEngineError due to host aggregate up-call when boot from volume and [cinder]/cross_az_attach=False (mriedem)
    • https://review.openstack.org/#/c/582342/
  • #link https://bugs.launchpad.net/nova/+bug/1784074 Instances end up with no cell assigned in instance_mappings (mriedem)
    • https://review.openstack.org/#/c/586713/ - need to change how conductor manager schedule_and_build_instances works (update instance mapping as soon as we create the instance in the cell); also need to collapse the two for loops
  • #link https://bugs.launchpad.net/nova/+bug/1784093 Build requests can be orphaned without instance mappings (mnaser/melwitt)
    • Create build_requests, instance_mappings, and request_specs in a single DB transaction

• Cells testing

• Open Reviews
  • #link https://review.openstack.org/#/c/581910/ Add another up-call to the cells v2 caveats list (mriedem)

• Open Discussion
  • Cross-cell migration (mriedem)
    • Some draft ideas in https://etherpad.openstack.org/p/nova-ptg-stein-cells
  • Config option to hide VMs if any in a down cell (mriedem)
    • Huawei public cloud operators want the ability to not list any VMs if at least one is in a down cell; show is OK, but they don't want users to be confused about why there are missing VMs (this would be before the new microversion). : https://review.openstack.org/592428/ (open for comments on the approach);

Previous Meetings

http://eavesdrop.openstack.org/meetings/nova_cells/