@Override
      public void write(Writable w) throws IOException {
        if (w instanceof Text) {
          writeText((Text) w);
        } else if (w instanceof PutWritable) {
          writePut((PutWritable) w);
        } else {
          throw new IOException("Unexpected writable " + w);
        }
      }
Retrieve the family path, first check the JobConf, then the table properties.
@return the family path or null if not specified.
hbase-handler/src/java/org/apache/hadoop/hive/hbase/HiveHFileOutputFormat.java