static byte[] toByteArray() {
    ZooKeeperProtos.ClusterUp.Builder builder = ZooKeeperProtos.ClusterUp.newBuilder();
    builder.setStartDate(new java.util.Date().toString());
    return ProtobufUtil.prependPBMagic(builder.build().toByteArray());
  }
Returns Content of the clusterup znode as a serialized pb with the pb magic as prefix.
hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/ClusterStatusTracker.java