Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3916#discussion_r25303965
--- Diff:
launcher/src/main/java/org/apache/spark/launcher/SparkSubmitCommandBuilder.java
---
@@ -0,0 +1,335 @@
+/*
+ * 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.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+
+import static org.apache.spark.launcher.CommandBuilderUtils.*;
+
+/**
+ * Special launcher for handling a CLI invocation of SparkSubmit.
+ * <p/>
+ * This launcher extends SparkLauncher to add command line parsing
compatible with
+ * SparkSubmit. It handles setting driver-side options and special parsing
needed
+ * for the different specialClasses.
+ * <p/>
+ * This class has also some special features to aid PySparkLauncher.
+ */
+class SparkSubmitCommandBuilder extends AbstractCommandBuilder {
+
+ /**
+ * Name of the app resource used to identify the PySpark shell. The
command line parser expects
+ * the resource name to be the very first argument to spark-submit in
this case.
+ *
+ * NOTE: this cannot be "pyspark-shell" since that identifies the
PySpark shell to SparkSubmit
+ * (see java_gateway.py), and can cause this code to enter into an
infinite loop.
+ */
+ static final String PYSPARK_SHELL = "pyspark-shell-main";
--- End diff --
in `bin/pyspark`, why not just run `python` directly as before, instead of
launching a JVM to compile the python command and dealing with all the
escaping, just for BASH to launch the python command again? Then you won't need
this extra `pyspark-shell-main` to avoid an infinite loop. Is there a
particular motivation for restructuring the `pyspark` script this way? Does it
have something to do with children processes not exiting properly if the parent
dies?
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