Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/3916#discussion_r25147958
--- Diff:
launcher/src/main/java/org/apache/spark/launcher/SparkClassCommandBuilder.java
---
@@ -0,0 +1,155 @@
+/*
+ * 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.launcher;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Pattern;
+
+import static org.apache.spark.launcher.CommandBuilderUtils.*;
+
+/**
+ * Command builder for internal Spark classes.
+ * <p/>
+ * This class handles building the command to launch all internal Spark
classes except for
+ * SparkSubmit (which is handled by {@link SparkSubmitCommandBuilder}
class.
+ */
+class SparkClassCommandBuilder extends SparkLauncher implements
CommandBuilder {
--- End diff --
It might be worth noting here that this never actually uses `launch` and
instead it just uses the shared plumbing for building commands. It's a bit
non-obvious to have this thing extend SparkLauncher but have no intention of
ever being used to launch something.
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