Github user NiharS commented on a diff in the pull request:
https://github.com/apache/spark/pull/22192#discussion_r212777617
--- Diff: core/src/main/java/org/apache/spark/ExecutorPlugin.java ---
@@ -0,0 +1,38 @@
+/*
+ * 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. We will
+ * *hopefully* be able to keep compatability by providing default
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 interface ExecutorPlugin {
--- End diff --
Pinging @squito for this one, not sure if he specifically wanted an empty
API to start (and have plugins run to their own completion or until the JVM
cleans them up) or was considering adding methods later
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