It is a new beast (good pun, by the way). There are no service dependencies like HBase or Zookeeper, and there is not really any packaging to speak of since it's just a JAR file.
Some open source is used internally, especially Netty, but our goal has always been to build a tightly coupled system for performance reasons. For example, the entire replication pipeline including the optimized Raft implementation is from scratch, as is the scheduler.
LSM trees perform well especially on SSDs, but we probably will migrate away from them eventually to something closer to LMDB in order to get a zero-copy read path.
Some open source is used internally, especially Netty, but our goal has always been to build a tightly coupled system for performance reasons. For example, the entire replication pipeline including the optimized Raft implementation is from scratch, as is the scheduler.
LSM trees perform well especially on SSDs, but we probably will migrate away from them eventually to something closer to LMDB in order to get a zero-copy read path.