parquet code demo
http://www.programcreek.com/java-api-examples/index.php?source_dir=hiped2-master/src/main/java/hip/ch3/parquet/ExampleParquetMapReduce.java
http://www.programcreek.com/java-api-examples/index.php?source_dir=hiped2-master/src/main/java/hip/ch3/parquet/ExampleParquetMapReduce.java