One of unique capabilities of Ignite is a distributed in-memory file system called Ignite File System (IGFS). IGFS delivers similar functionality to Hadoop HDFS, but only in memory. In fact, in addition to its own APIs, IGFS implements Hadoop FileSystem API and can be transparently plugged into Hadoop or Spark deployments.
IGFS splits the data from each file into separate data blocks and stores them in a distributed in-memory cache. However, unlike Hadoop HDFS, IGFS does not need a name node and automatically determines file data locality using a hashing function.
IGFS can be deployed stand alone, as well as on top of HDFS, in which case it becomes a transparent caching layer for the files stored in HDFS.