Re: rbd export-diff/import-diff hangs

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To update, hanging happens when updating local image, not remote, networking
is not a concern here. Any advices how to look into it?

Thanks!
Tony
________________________________________
From: Tony Liu <tonyliu0592@xxxxxxxxxxx>
Sent: August 26, 2023 10:43 PM
To: dev@xxxxxxx; ceph-users@xxxxxxx
Subject:  rbd export-diff/import-diff hangs

Hi,

I'm using rbd import and export to copy image from one cluster to another.
Also using import-diff and export-diff to update image in remote cluster.
For example, "rbd --cluster local export-diff ... | rbd --cluster remote import-diff ...".
Sometimes, the whole command is stuck. I can't tell it's stuck on which end of the pipe.
I did some search, [1] seems the same issue and [2] is also related.

Wonder if there is any way to identify where it's stuck and get more debugging info.
Given [2], I'd suspect the import-diff is stuck, cause rbd client is importing to the
remote cluster. Networking latency could be involved here? Ping latency is 7~8 ms.

Any comments is appreciated!

[1] https://bugs.launchpad.net/cinder/+bug/2031897
[2] https://stackoverflow.com/questions/69858763/ceph-rbd-import-hangs

Thanks!
Tony
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