[GitHub] [incubator-kyuubi] yaooqinn commented on a diff in pull request #3155: [KYUUBI #3154][Subtask] Connectors for Spark SQL Query Engine -> TiDB/TiKV

[GitBox <gi...@apache.org>]

yaooqinn commented on code in PR #3155:
URL: https://github.com/apache/incubator-kyuubi/pull/3155#discussion_r931796344


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docs/connector/spark/tidb.rst:
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+.. Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+..    http://www.apache.org/licenses/LICENSE-2.0
+
+.. Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+`TiDB`_
+==========
+
+TiDB is an open-source NewSQL database that supports Hybrid Transactional and Analytical Processing
+(HTAP) workloads.
+
+TiSpark is a thin layer built for running Apache Spark on top of TiDB/TiKV to answer complex OLAP
+queries. It enjoys the merits of both the Spark platform and the distributed clusters
+of TiKV while seamlessly integrated to TiDB to provide one-stop HTAP solutions for online
+transactions and analyses.
+
+.. tip::
+   This article assumes that you have mastered the basic knowledge and operation of TiDB and TiSpark.
+   For the knowledge not mentioned in this article, you can obtain it from TiDB `Official Documentation`_.
+
+By using kyuubi, we can run SQL queries towards TiDB/TiKV which is more
+convenient, easy to understand, and easy to expand than directly using
+spark to manipulate TiDB/TiKV.
+
+TiDB Integration
+-------------------
+
+To enable the integration of kyuubi spark sql engine and TiDB through
+Apache Spark Datasource V2 and Catalog APIs, you need to:
+
+- Referencing the TiSpark :ref:`dependencies`
+- Setting the spark extension and catalog :ref:`configurations`
+
+.. _dependencies:
+
+Dependencies
+************
+The classpath of kyuubi spark sql engine with TiDB supported consists of
+
+1. kyuubi-spark-sql-engine-|release|.jar, the engine jar deployed with Kyuubi distributions
+2. a copy of spark distribution
+3. tispark-assembly-<spark.version>_<scala.version>-<tispark.version>.jar (example: tispark-assembly-3.2_2.12-3.0.1.jar), which can be found in the `Maven Central`_
+
+In order to make the TiSpark packages visible for the runtime classpath of engines, we can use one of these methods:
+
+1. Put the TiSpark packages into ``$SPARK_HOME/jars`` directly
+2. Set ``spark.jars=/path/to/tispark-assembly``
+
+.. warning::
+   Please mind the compatibility of different TiDB, TiSpark and Spark versions, which can be confirmed on the page of `Environment setup`_.
+
+.. _configurations:
+
+Configurations
+**************
+
+To activate functionality of TiSpark, we can set the following configurations:
+
+.. code-block:: properties
+
+   spark.tispark.pd.addresses $pd_host:$pd_port
+   spark.sql.extensions org.apache.spark.sql.TiExtensions
+   spark.sql.catalog.tidb_catalog  org.apache.spark.sql.catalyst.catalog.TiCatalog
+   spark.sql.catalog.tidb_catalog.pd.addresses $pd_host:$pd_port
+
+The `spark.tispark.pd.addresses` and `spark.sql.catalog.tidb_catalog.pd.addresses` configurations
+allow you to put in multiple PD servers. Specify the port number for each of them.
+
+For example, when you have multiple PD servers on `10.16.20.1,10.16.20.2,10.16.20.3` with the port `2379`,
+put it as `10.16.20.1:2379,10.16.20.2:2379,10.16.20.3:2379`.
+
+TiDB Operations
+------------------
+
+Taking ``SELECT`` as a example,
+
+.. code-block:: sql
+
+   SELECT * FROM foo;
+
+Taking ``DELETE FROM`` as a example, Spark 3 added support for DELETE FROM queries to remove data from tables.
+
+.. code-block:: sql
+
+   DELETE FROM foo WHERE id >= 1 and id < 2;
+
+.. note::
+   As for now (TiSpark 3.0.1), TiSpark does not support ``CREATE TABLE``, ``INSERT INTO/OVERWRITE`` operations
+   through Apache Spark Datasource V2 and Catalog APIs.
+
+.. _Official Documentation: https://docs.pingcap.com/tidb/stable/overview
+.. _Maven Central: https://repo1.maven.org/maven2/com/pingcap/tispark/
+.. _Environment setup: https://docs.pingcap.com/tidb/stable/tispark-overview#environment-setup

Review Comment:
   TiSpark Environment setup



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