public static byte[] getRowKey(String serverName, long timestamp) {
    // converting to string since this will help seeing the timestamp in string format using
    // hbase shell commands.
    String timestampStr = String.valueOf(timestamp);
    final String rowKeyStr = serverName + DELIMITER + timestampStr;
    return Bytes.toBytes(rowKeyStr);
  }
Creates a rowkey with region server name and timestamp.
@param serverName region server name
@param timestamp  timestamp
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationMarkerChore.java