FIX: Internal Error During Recovery

CAUSE

When a superior Transaction Manager attempts to notify a subordinate Transaction Manager of a commit decision, it enters the NOTIFYING COMMITTED state. If the connection between the Transaction Managers is broken before sending the COMMITREQ message, the superior Transaction Manager does not properly catch the down event so that it can log the failure to deliver the commit message. This may leave the Distributed Transaction Coordinator in an inconsistent state when it recovers from a failure.