Github user mccheah commented on a diff in the pull request:
https://github.com/apache/spark/pull/21923#discussion_r207072577
--- Diff: core/src/main/java/org/apache/spark/AbstractExecutorPlugin.java
---
@@ -0,0 +1,39 @@
+/*
+ * 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.
+ */
+
+package org.apache.spark;
+
+import org.apache.spark.annotation.DeveloperApi;
+
+/**
+ * A plugin which can be automaticaly instantiated within each Spark
executor. Users can specify
+ * plugins which should be created with the "spark.executor.plugins"
configuration. An instance
+ * of each plugin will be created for every executor, including those
created by dynamic allocation,
+ * before the executor starts running any tasks.
+ *
+ * The specific api exposed to the end users still considered to be very
unstable. If implementors
+ * extend this base class, we will *hopefully* be able to keep
compatability by providing dummy
+ * implementations for any methods added, but make no guarantees this will
always be possible across
+ * all spark releases.
+ *
+ * Spark does nothing to verify the plugin is doing legitimate things, or
to manage the resources
+ * it uses. A plugin acquires the same privileges as the user running the
task. A bad plugin
+ * could also intefere with task execution and make the executor fail in
unexpected ways.
+ */
+@DeveloperApi
+public class AbstractExecutorPlugin {
--- End diff --
`interface`? A bit more flexibility in terms of the user's desired class
hierarchy.
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