Re-post my rely to make sure it goes through the mailing list.
----- Forwarded Message ----- From: Yixin Jin <yjin77@xxxxxxxx>To: Soumya Koduri <skoduri@xxxxxxxxxx>Sent: Monday, April 24, 2023 at 02:37:46 p.m. EDTSubject: Re: Re: Bucket sync policy
An update:
After creating and enabling the bucket sync policy, I ran "bucket sync markers" and saw that each shard had the status of "init". The run "bucket sync run" in the end marked the status to be "incremental-sync", which seems to go through full-sync stage. However, the lone object in the source zone wasn't synced over to the destination zone.
I actually used gdb to walk through radosgw-admin to run "bucket sync run". It seems not to do anything for full-sync and it printed a log saying "finished iterating over all available prefixes:...", which actually broke off the do-while loop after the call to prefix_handler.revalidate_marker(&list_marker). This call returned false because it couldn't find rules from the sync pipe. I haven't drilled deeper to see why it didn't get rules, whatever it means. Nevertheless, the workaround with "bucket sync run" doesn't seem to work, at least not with Quincy.
Regards,Yixin
On Monday, April 24, 2023 at 12:37:24 p.m. EDT, Soumya Koduri <skoduri@xxxxxxxxxx> wrote:
On 4/24/23 21:52, Yixin Jin wrote:
> Hello ceph gurus,
>
> We are trying bucket-specific sync policy feature with Quincy release and we encounter something strange. Our test setup is very simple. I use mstart.sh to spin up 3 clusters, configure them with a single realm, a single zonegroup and 3 zones – z0, z1, z2, with z0 being the master. I created a zonegroup-level sync policy with “allowed”, a symmetrical flow among all 3 zones and a pipe allowing all zones to all zones. I created a single bucket “test-bucket” at z0 and uploaded a single object to it. By now, there should be no sync since the policy is “allowed” only and I can see the single file only exist in z0 and “bucket sync status” shows the sync is actually disabled. Finally, I created a bucket-specific sync policy being “enabled” and a pipe between z0 and z1 only. I expected that sync should be kicked off between z0 and z1 and I did see from “sync info” that there are sources/dests being z0/z1. “bucket sync status” also shows the source zone and source bucket. At z0, it shows everything is caught up but at z1 it shows one shard is behind, which is expected since that only object exists in z0 but not in z1.
>
>
>
> Now, here comes the strange part. Although z1 shows there is one shard behind, it doesn’t seem to make any progress on syncing it. It doesn’t seem to do any full sync at all since “bucket sync status” shows “full sync: 0/11 shards”. There hasn’t been any full sync since otherwise, z1 should have that only object. It is stuck in this condition forever until I make another upload on the same object. I suspect the update of the object triggers a new data log, which triggers the sync. Why wasn’t there a full sync and how can one force a full sync?
yes this is known_issue yet to be addressed with bucket level sync
policy ( - https://tracker.ceph.com/issues/57489 ). The interim
workaround to sync existing objects is to either
* create new objects (or)
* execute "bucket sync run"
after creating/enabling the bucket policy.
Please note that this issue is specific to only bucket policy but
doesn't exist for sync-policy set at zonegroup level.
Thanks,
Soumya
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