How to Improve RGW Bucket Stats Performance

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Hi!

To bill our customers we regularly call radosgw-admin bucket stats --uid <uid>.

Since upgrading from Mimic to Octopus (with a short stop at Nautilus), we’ve been seeing much slower response times for this command.

It went from less than a minute for our largest customers, to 5 minutes (with some variance depending on load).

Assuming this is not a bug, is there any way to get these stats quicker?

Ceph seems to do in a single call here, which seems to me like something you could spread out over time (keep a counter somewhere and just return the latest value on request).

One thing we did notice, is that we get a lot of these when the stats are synced:

	2020-11-13T14:56:17.288+0100 7f15347e0700  0 check_bucket_shards: resharding needed: stats.num_objects=5776982 shard max_objects=3200000

Could that hint at a problem in our configuration?

Anything else we could maybe tune to get this time down?

Appreciate any hints and I hope everyone is about to have a great weekend.

Denis
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