/** @param packet */
 private void handleCommitRollback(final ReplicationCommitMessage packet) throws Exception {
   Journal journalToUse = getJournal(packet.getJournalID());
   if (packet.isRollback()) {
     journalToUse.appendRollbackRecord(packet.getTxId(), noSync);
   } else {
     journalToUse.appendCommitRecord(packet.getTxId(), noSync);
   }
 }