The MapR File System (MapR FS) is a clustered file system that supports both verylarge-scale and high-performance uses. MapR FS supports a variety of interfaces includingconventional read/write file access via NFS and a FUSE interface, as well as via the HDFS interface used bymany systems such as Apache Hadoop and Apache Spark. In addition to file-oriented access,MapR FS supports access to tables and message streams using the Apache HBase and Apache Kafka APIs as well as via a document database interface.