Description of problem: The proposed fix for a race condition in multisite during full sync involving deletes. A custom header was added passing the destination zone's trace string and is then checked against the object's replication trace. If there is a match, a 304 response is returned which will prevent full sync from overwriting a deleted object. Please see the tracker for more details.
Please specify the severity of this bug. Severity is defined here: https://bugzilla.redhat.com/page.cgi?id=fields.html#bug_severity.