Re: memory usage of: radosgw-admin bucket rm

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Hi Harald,

Please file a tracker issue, yes.  (Deletes do tend to be slower,
presumably due to rocksdb compaction.)

Matt

On Tue, Jul 9, 2019 at 7:12 AM Harald Staub <harald.staub@xxxxxxxxx> wrote:
>
> Currently removing a bucket with a lot of objects:
> radosgw-admin bucket rm --bucket=$BUCKET --bypass-gc --purge-objects
>
> This process was killed by the out-of-memory killer. Then looking at the
> graphs, we see a continuous increase of memory usage for this process,
> about +24 GB per day. Removal rate is about 3 M objects per day.
>
> It is not the fastest hardware, and this index pool is still without
> SSDs. The bucket is sharded, 1024 shards. We are on Nautilus 14.2.1, now
> about 500 OSDs.
>
> So with this bucket with 60 M objects, we would need about 480 GB of RAM
> to come through. Or is there a workaround? Should I open a tracker issue?
>
> The killed remove command can just be called again, but it will be
> killed again before it finishes. Also, it has to run some time until it
> continues to actually remove objects. This "wait time" is also
> increasing. Last time, after about 16 M objects already removed, the
> wait time was nearly 9 hours. Also during this time, there is a memory
> ramp, but not so steep.
>
> BTW it feels strange that the removal of objects is slower (about 3
> times) than adding objects.
>
>   Harry
> _______________________________________________
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> ceph-users@xxxxxxxxxxxxxx
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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

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