MapR Direct Access NFS™ makes Apache Hadoop radically easier and less expensive to use. MapR allows files to be modified, overwritten, and enables multiple concurrent reads and writes on any file. While other distributions try to provide NFS mounts, they are read-only in nature, are not highly available and suffer from poor NFS gateway performance. Unlike MapR, HDFS is not POSIX compliant, and does not provide standard file system functionality.
With MapR, users can derive several benefits from an industry standard interface that connects to a random read-write capable file system and that does not compromise on performance.