Large OMAP object in RGW GC pool

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Hi,

I've got a Ceph cluster with this status:

    health: HEALTH_WARN
            3 large omap objects

After looking into it I see that the issue comes from objects in the
'.rgw.gc' pool.

Investigating it I found that the gc.* objects have a lot of OMAP keys:

for OBJ in $(rados -p .rgw.gc ls); do
  echo $OBJ
  rados -p .rgw.gc listomapkeys $OBJ|wc -l
done

I then found out that on average these objects have about 100k of OMAP
keys each, but two stand out and have about 3M OMAP keys.

I can list the GC with 'radosgw-admin gc list' and this yields a JSON
which is a couple of MB in size.

I ran:

$ radosgw-admin gc process

That runs for hours and then finishes, but the large list of OMAP keys
stays.

Running Mimic 13.3.5 on this cluster.

Has anybody seen this before?

Wido
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