Whether a URI may be mirrored off the object; rechecked in drainMirrors() because a stale queue row can outlive the rule (a public file replaced by a private one at the same URI).
drainMirrors()
Whether a URI may be mirrored off the object; rechecked in
drainMirrors()because a stale queue row can outlive the rule (a public file replaced by a private one at the same URI).