Hi Denis,
You might want to look at rgw_gc_obj_min_wait from [1] and try
increasing the default value of 7200s (2 hours) to whatever suits your
need < 2^64.
Just remind that at some point you'll have to get these objects
processed by the gc. Or manually through the API [2].
One thing that comes to mind regarding the "last night's missing object"
is maybe it was multi-part re-written and the re-write failed somehow
and the object was then enlisted by the gc. But that supposes this
particular object sometimes gets re-written which may not be the case.
Regards,
Frédéric.
[1] https://docs.ceph.com/en/latest/radosgw/config-ref/
[2]
https://docs.ceph.com/en/latest/dev/radosgw/admin/adminops_nonimplemented/#manually-processes-garbage-collection-items
Le 18/11/2020 à 11:27, Denis Krienbühl a écrit :
By the way, since there’s some probability that this is a GC refcount issue, would it be possible and sane to somehow slow the GC down or disable it altogether? Is that something we could implement on our end as a stop-gap measure to prevent dataloss?
On 18 Nov 2020, at 10:46, Denis Krienbühl <denis@xxxxxxx> wrote:
I can now confirm that last night’s missing object was a multi-part file.
On 18 Nov 2020, at 10:01, Janek Bevendorff <janek.bevendorff@xxxxxxxxxxxxx> wrote:
Sorry, it's radosgw-admin object stat --bucket=BUCKETNAME --object=OBJECTNAME (forgot the "object" there)
On 18/11/2020 09:58, Janek Bevendorff wrote:
The object, a Docker layer, that went missing has not been touched in 2 months. It worked for a while, but then suddenly went missing.
Was the object a multipart object? You can check by running radosgw-admin stat --bucket=BUCKETNAME --object=OBJECTNAME. It should say something "ns": "multipart" in the output. If it says "ns": "shadow", it's a single-part object.
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