Hi Sage and all, Another bug discovered during the proxy write teuthology testing is when rolling back to a degraded object. This doesn't seem specific to proxy write. I see a scenario like below from the log file:
- A rollback op comes in, and is enqueued. - Several other ops on the same object come in, and are enqueued. - The rollback op dispatches, and finds the object which it rollbacks to is degraded, then this op is pushbacked into a list to wait for the degraded object to recover. - The later ops are handled and responded back to client. - The degraded object recovers. The rollback op is enqueued again and finally responded to client. This breaks the op order. A fix for this is to maintain a map to track the <source, destination> pair. And when an op on the source dispatches, if such a pair exists, queue the op in the destination's degraded waiting list. A drawback of this approach is that some entries in the ' waiting_for_degraded_object' list of the destination object may not be actually accessing the destination, but the source. Does this make sense? -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
