Swift processes constantly overload controllers after reboot

[Artem Panchenko]

Fuel version info (9.0 mos #427): http://paste.openstack.org/show/508639/

After all controllers graceful reboot (simultaneous), could becomes broken for 1 hour because different services can't start and work properly due to heavy overload (CPU). After 1 hour my environment was stabilized and OpenStack basic function started to work (OSTF passed), but all controllers are still overloaded by Swift python processes:

http://paste.openstack.org/show/508640/

node specs: http://paste.openstack.org/show/508641/

Also Swift processes are being constantly re-spawned by something (PIDs are changed):

http://paste.openstack.org/show/508548/

Here is a part of swift logs:

http://paste.openstack.org/show/508547/

Steps to reproduce:

1. Create cluster with 3 controllers and 2 computes, defaults for storage
2. Reboot all cluster nodes
3. Run OSTF

Expected result: tests are passed

Actual result: test fails for ~ 1 hour due to controller nodes overload

Diagnostic snapshot: https://drive.google.com/file/d/0BzaZINLQ8-xkcjV4MDF2TktSSVk/view?usp=sharing

[Anastasia Kuznetsova (akuznetsova)]

As for me, it is to risky to try to fix it quickly before HCF, because:
- tested case is not usual (rebooting of all nodes), it means, that issue is reproduced only in specific scenario, not after every deployment;
- finally, env goes to "working" status (> "After 1 hour my environment was stabilized and OpenStack basic function started to work (OSTF passed)")

[Dina Belova (dbelova)]

Agree with Nastya, moving the bug to 9.0-updates for the 9.0 series.