To extract data from HDFS, a PowerExchange for Hadoop mapping contains a flat file source. To load data to HDFS or Hive, a PowerExchange for Hadoop mapping contains a flat file target.

In the Workflow Manager, you specify the HDFS flat file reader to extract data from HDFS. You specify the HDFS flat file writer to load data to HDFS or Hive. You select a Hadoop HDFS connection object to access the HDFS database tier of Hadoop.

The Integration Service communicates with Hadoop through the Java Native Interface (JNI). JNI is a programming framework that enables Java code running in a Java Virtual Machine (JVM) to call or be called.