HCatInputFormat.java

public class HCatInputFormat extends InputFormat<SerializableWritable<Writable>, HCatRecord> {
	
	private final org.apache.hcatalog.mapreduce.HCatInputFormat input;
	
	public HCatInputFormat() {
		input = new org.apache.hcatalog.mapreduce.HCatInputFormat();
	}

	@Override
	public RecordReader<SerializableWritable<Writable>, HCatRecord> createRecordReader(
			InputSplit arg0, TaskAttemptContext arg1) throws IOException,
			InterruptedException {
		return new HCatRecordReader(input.createRecordReader(arg0, arg1));
	}

	@Override
	public List<InputSplit> getSplits(JobContext arg0) throws IOException,
			InterruptedException {
		return input.getSplits(arg0);
	}

}

HCatRecordReader.java

class HCatRecordReader extends RecordReader<SerializableWritable<Writable>, HCatRecord>  {
	private final RecordReader<WritableComparable, HCatRecord> reader;
	
	public HCatRecordReader(RecordReader<WritableComparable, HCatRecord> reader) {
		this.reader = reader;
	}

	@Override
	public void close() throws IOException {
		reader.close();
	}

	@Override
	public SerializableWritable<org.apache.hadoop.io.Writable> getCurrentKey() throws IOException,
			InterruptedException {
		return new SerializableWritable<org.apache.hadoop.io.Writable>(reader.getCurrentKey());
	}

	@Override
	public HCatRecord getCurrentValue() throws IOException,
			InterruptedException {
		return reader.getCurrentValue();
	}

	@Override
	public float getProgress() throws IOException, InterruptedException {
		return reader.getProgress();
	}

	@Override
	public void initialize(InputSplit arg0, TaskAttemptContext arg1)
			throws IOException, InterruptedException {
		reader.initialize(arg0, arg1);
	}

	@Override
	public boolean nextKeyValue() throws IOException, InterruptedException {
		return reader.nextKeyValue();
	}

}

test.scala

val f = classOf[org.my.package.spark.hcatalog.HCatInputFormat]
val k = classOf[org.apache.spark.SerializableWritable[org.apache.hadoop.io.Writable]]
val v = classOf[org.apache.hcatalog.data.HCatRecord]
val conf = new org.apache.hadoop.conf.Configuration()
org.apache.hcatalog.mapreduce.HCatInputFormat.setInput(conf, "db", "table")
val data = sc.newAPIHadoopRDD(conf, f, k, v)