[KYUUBI #1347 ] [DOC] Fix miscellaneous doc typos

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### _Why are the changes needed?_
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Some spelling & grammar format fix.

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [ ] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #1347 from zhenjiaguo/typo-fix.

Closes #1347

5c20ae28 [zhenjiaguo] change serial to several
db3fa969 [zhenjiaguo] typo fix

Authored-by: zhenjiaguo <zhenjia_guo@163.com>
Signed-off-by: ulysses-you <ulyssesyou@apache.org>

2021-11-08 09:27:37 +08:00

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Kyuubi v.s. HiveServer2

Introduction

HiveServer2 is a service that enables clients to execute Hive QL queries on Hive supporting multi-client concurrency and authentication. Kyuubi enables clients to execute Spark SQL queries directly on Spark supporting multi-client concurrency and authentication too.

They are both designed to provide better support for open API clients like JDBC and ODBC to manage and analyze BigData.

Hive on Spark

The purpose of Hive on Spark is to add Spark as a third execution backend, parallel to MR and Tez. Comparing to Hive on MR, it's use the Spark DAG will help improve the performance of Hive queries, especially those have multiple reducer stages.

Differences Between Kyuubi and HiveServer2

Kyuubi	HiveServer2
Language	Spark SQL	Hive QL
Optimizer	Spark SQL Catalyst	Hive Optimizer
Engine	up to Spark 3.x	MapReduce/up to Spark 2.3/Tez
Performance	High	Low
Compatibility with Spark	Good	Bad(need to rebuild on a specific version)
Data Types	Spark Data Types	Hive Data Types

Performance

References

HiveServer2 Overview

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