Re: rgw index shard much larger than others

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Hi Dan,

Possibly you're reproducing https://tracker.ceph.com/issues/46456.

That explains how the underlying issue worked, I don't remember how a
bucked exhibiting this is repaired.

Eric?

Matt


On Thu, Oct 1, 2020 at 8:41 AM Dan van der Ster <dan@xxxxxxxxxxxxxx> wrote:
>
> Dear friends,
>
> Running 14.2.11, we have one particularly large bucket with a very
> strange distribution of objects among the shards. The bucket has 512
> shards, and most shards have ~75k entries, but shard 0 has 1.75M
> entries:
>
> # rados -p default.rgw.buckets.index listomapkeys
> .dir.61c59385-085d-4caa-9070-63a3868dccb6.272652427.1.0 | wc -l
> 1752085
>
> # rados -p default.rgw.buckets.index listomapkeys
> .dir.61c59385-085d-4caa-9070-63a3868dccb6.272652427.1.1 | wc -l
> 78388
>
> # rados -p default.rgw.buckets.index listomapkeys
> .dir.61c59385-085d-4caa-9070-63a3868dccb6.272652427.1.2 | wc -l
> 78764
>
> We had resharded this bucket (manually) from 32 up to 512 shards just
> before upgrading from 12.2.12 to 14.2.11 a couple weeks ago.
>
> Any idea why shard .0 is getting such an imbalance of entries?
> Should we manually reshard this bucket again?
>
> Thanks!
>
> Dan
> _______________________________________________
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>
>


-- 

Matt Benjamin
Red Hat, Inc.
315 West Huron Street, Suite 140A
Ann Arbor, Michigan 48103

http://www.redhat.com/en/technologies/storage

tel.  734-821-5101
fax.  734-769-8938
cel.  734-216-5309
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