|  | ----------------------------------------------------------------------------- | 
|  | HttpFS - Hadoop HDFS over HTTP | 
|  |  | 
|  | HttpFS is a server that provides a REST HTTP gateway to HDFS with full | 
|  | filesystem read & write capabilities. | 
|  |  | 
|  | HttpFS can be used to transfer data between clusters running different | 
|  | versions of Hadoop (overcoming RPC versioning issues), for example using | 
|  | Hadoop DistCP. | 
|  |  | 
|  | HttpFS can be used to access data in HDFS on a cluster behind of a firewall | 
|  | (the HttpFS server acts as a gateway and is the only system that is allowed | 
|  | to cross the firewall into the cluster). | 
|  |  | 
|  | HttpFS can be used to access data in HDFS using HTTP utilities (such as curl | 
|  | and wget) and HTTP libraries Perl from other languages than Java. | 
|  | ----------------------------------------------------------------------------- |