[rgw] Very high cache misses with automatic bucket resharding

[Rudenko Aleksandr <ARudenko@xxxxxxx>]

Hi, guys.

I use Luminous 12.2.5.

Automatic bucket index resharding has not been activated in the past.

Few days ago i activated auto. resharding.

After that and now i see:

- very high Ceph read I/O (~300 I/O before activating resharding, ~4k now),
- very high Ceph read bandwidth (50 MB/s before activating resharding, 250 MB/s now),
- very high RGW cache miss (400 count/s before activating resharding, ~3.5k now).

For Ceph monitoring i use MGR+Zabbix plugin and zabbix-template from ceph github repo.
For RGW monitoring i use RGW perf dump and my script.

Why is it happening? When is it ending?

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