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On 11/10/19 12:41, Matt Riedemann wrote:
> On 11/10/2019 10:29 AM, Balázs Gibizer wrote:
>> * Also there could be two cells running this command at the same time
>> fighting for the API db lock,
> 
> In Train the --all-cells option was added to the CLI so that should 
> resolve this issue. I think Mel said she backported those changes 
> internally so I'm not sure how hard it would be for those to go back to 
> Stein or Rocky or whatever release CERN is using now.

That's correct, I backported --all-cells [1][2][3][4] to Stein, Rocky, 
and Queens downstream. I found it not to be easy but YMMV.

The primary conflicts in Stein were with --before, so I went ahead and 
brought those patches back as well [5][6][7] since we also needed 
--before to help people avoid the "orphaned virt guests if archive runs 
while nova-compute is down" problem.

Same deal for Rocky.

And finally with Queens, there's an additional conflict around deleting 
instance group members [8], so I also brought that back because it's 
related to all of the database cleanup issues that support has 
repeatedly faced with customers.

Hope this helps anyone considering backporting --all-cells.

Cheers,
-melanie

[1] https://review.opendev.org/675218
[2] https://review.opendev.org/675209
[3] https://review.opendev.org/675205
[4] https://review.opendev.org/507486
[5] https://review.opendev.org/661289
[6] https://review.opendev.org/556751
[7] https://review.opendev.org/643779
[8] https://review.opendev.org/598953