| 
 Features  | 
 Cloudera  | 
 MapR  | 
 HortonWorks  | 
| 
 License  | 
 Commercial  | 
 Commercial  | 
 Open-Source  | 
| 
 Community  | 
 Yes  | 
 Yes  | 
 Yes  | 
| 
 SQL  | 
 Impala  | 
 Hive, Drill, Shark  | 
 Stinger  | 
| 
 MapReduce  | 
 Yes  | 
 Yes  | 
 Yes  | 
| 
 Unique Features  | 
 Cloudera Manager  | 
 Direct Access NFS  | 
 100% open-source  | 
| 
 App Development  | 
 Not Built-in  | 
 Not Built-in  | 
 Not Built-in  | 
| 
 Operating System  | 
 LINUX  | 
 LINUX  | 
 LINUX  | 
| 
 Free to use  | 
 60 day Trial  | 
 M3 free addition  | 
 100% free  | 
| 
 Revenue  | 
 56% of total big data  | 
 23% of total big data  | 
 18% of total big data  | 
 
I have explained the difference all the 3 architecture that is MapR Horton Works and Cloudera. But Cloudera has its own Impala query language.