question: private void addReplicationFactor ( Operation op ) { op . addRequestHeader ( Operation . REPLICATION_QUORUM_HEADER , Operation . REPLICATION_QUORUM_HEADER_VALUE_ALL ) ; }
target:  Authorization related operations should take effect on all replicas, before they complete. This method adds a special header that sets the quorum level to all available nodes, avoiding a race where a client can reach a node that has not yet received latest authorization changes, even if it received success from this auth helper class