Relationship Between HetuEngine and Other Components

The HetuEngine installation depends on the MRS cluster. Table 1 lists the components on which the HetuServer installation depends.

**Table 1** Components on which HetuEngine depends
Name	Description
HDFS	Hadoop Distributed File System, supporting high-throughput data access and suitable for applications with large-scale data sets.
Hive	Open-source data warehouse built on Hadoop. It stores structured data and implements basic data analysis using the Hive Query Language (HQL), a SQL-like language.
ZooKeeper	Enables highly reliable distributed coordination. It helps prevent single point of failures (SPOFs) and provides reliable services for applications.
KrbServer	Key management center that distributes bills.
Yarn	Resource management system, which is a general resource module that manages and schedules resources for various applications.
DBService	DBService is a high-availability relational database storage system that provides metadata backup and restoration functions.