Developer's Reference This section contains in-depth information for the developer. Hadoop Commands This section describes the Hadoop commands. HBase Shell for MapR-DB You can manage MapR-DB tables using HBase shell commands and additional HBase shell commands included in the MapR distribution of Hadoop. YARN commands This section describes the YARN commands. Source Code for MapR Software MapR releases source code to the open-source community for enhancements that MapR has made to the Apache Hadoop project and other ecosystem components.