ulysses-you commented on code in PR #3178:
URL: https://github.com/apache/incubator-kyuubi/pull/3178#discussion_r936383787


##########
docs/extensions/server/applications.rst:
##########
@@ -18,7 +18,71 @@ Manage Applications against Extra Cluster Managers
 
 .. versionadded:: 1.6.0
 
-.. caution:: unstable
+Application Operation
+---------------------
 
-.. warning::
-   This page is still in-progress.
+Kyuubi supports configure custom ``ApplicationOperation`` for certain cluster 
manager which provides an ability to control application, includes get 
application info and kill application.
+
+The steps of adding custom Application Operation
+-------------------------------------------------------
+
+1. reference kyuubi-server
+
+   .. code-block:: xml
+
+      <dependency>
+         <groupId>org.apache.kyuubi</groupId>
+         <artifactId>kyuubi-server_2.12</artifactId>
+         <version>1.5.2-incubating</version>
+         <scope>provided</scope>
+      </dependency>
+
+2. create a custom class which implements the 
``org.apache.kyuubi.engine.ApplicationOperation``.
+3. compile and put the jar into ``$KYUUBI_HOME/jars``
+
+.. code-block:: scala
+
+   trait ApplicationOperation {
+
+     /**
+      * Step for initializing the instance.
+      */
+     def initialize(conf: KyuubiConf): Unit
+
+     /**
+      * Step to clean up the instance
+      */
+     def stop(): Unit
+
+     /**
+      * Called before other method to do a quick skip
+      *
+      * @param clusterManager the underlying cluster manager or just local 
instance
+      */
+     def isSupported(clusterManager: Option[String]): Boolean
+
+     /**
+      * Kill the app/engine by the unique application tag
+      *
+      * @param tag the unique application tag for engine instance.
+      *            For example,
+      *            if the Hadoop Yarn is used, for spark applications,
+      *            the tag will be preset via spark.yarn.tags
+      * @return a message contains response describing how the kill process.
+      *
+      * @note For implementations, please suppress exceptions and always 
return KillResponse
+      */
+     def killApplicationByTag(tag: String): KillResponse

Review Comment:
   added the related code block



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