Hive service, HiveServer2 & MetaStore service?

Question

I am trying to understand hive in terms of architecture, and I am referring to Tom White\'s book on Hadoop.

I came across the following terms in regards to

Answer 1

My understanding is:

Hive Services includes: HS2(may call thrift server sometimes)、Driver, Compiler, Execution Engine. But these four component(HS2、Driver, Compiler, Execution Engine) are all in hiverserver2 process. So in hive, there are three processes:

• HS2(includes hs2 or thrift server, Compiler, Execution Engine)
• MetaStore
• WebHCat