Re: [rgw] Very high cache misses with automatic bucket resharding

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Hi,

Do you have on going resharding? 'radosgw-admin reshard list' should so you the status.

Do you see the number of objects in .rgw.bucket.index pool increasing?

I hit a lot of problems trying to use auto resharding in 12.2.5 - I have disabled it for the moment.

Thanks

[1] https://tracker.ceph.com/issues/24551

On Mon, Jul 16, 2018 at 12:32 PM, Rudenko Aleksandr <ARudenko@xxxxxxx> wrote:

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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