Some more feedback.

Author: Marcelo Vanzin

core/src/main/scala/org/apache/spark/deploy/worker/CommandUtils.scala

@@ -19,7 +19,7 @@ package org.apache.spark.deploy.worker
 
 import java.io.{File, FileOutputStream, InputStream, IOException}
 import java.lang.System._
-import java.util.{ArrayList, List => JList, Map => JMap}
+import java.util.{List => JList, Map => JMap}
 
 import scala.collection.JavaConversions._
 import scala.collection.Map
@@ -112,7 +112,7 @@ object CommandUtils extends Logging {
   }
 }
 
-private class CommandLauncher(sparkHome: String, memory: Int, env: Map[String, String])
+private class CommandLauncher(sparkHome: String, memoryMb: Int, env: Map[String, String])
     extends AbstractLauncher[CommandLauncher](env) {
 
   setSparkHome(sparkHome)
@@ -121,8 +121,8 @@ private class CommandLauncher(sparkHome: String, memory: Int, env: Map[String, S
     val cmd = buildJavaCommand()
     cmd.add("-cp")
     cmd.add(buildClassPath(null).mkString(File.pathSeparator))
-    cmd.add(s"-Xms${memory}M")
-    cmd.add(s"-Xmx${memory}M")
+    cmd.add(s"-Xms${memoryMb}M")
+    cmd.add(s"-Xmx${memoryMb}M")
     addOptionString(cmd, getenv("SPARK_JAVA_OPTS"))
     cmd
   }

launcher/src/main/java/org/apache/spark/launcher/AbstractLauncher.java

@@ -34,7 +34,9 @@
 import java.util.regex.Pattern;
 
 /**
- * Basic functionality for launchers.
+ * Basic functionality for launchers - objects that encapsulate knowledge about how to build the
+ * commands to run a Spark application or service. This class is not meant to be extended by user
+ * code.
  */
 public abstract class AbstractLauncher<T extends AbstractLauncher> extends LauncherCommon {
 

launcher/src/main/java/org/apache/spark/launcher/LauncherCommon.java

@@ -23,7 +23,7 @@
 import java.util.Map;
 
 /**
- * Configuration key definitions for Spark jobs, and some helper methods.
+ * Configuration key definitions for Spark apps, and some helper methods.
  */
 public class LauncherCommon {
 
@@ -128,7 +128,7 @@ protected static boolean isWindows() {
    * Updates the user environment to contain the merged value of "envKey" after appending
    * the given path list.
    */
-  protected void mergeEnvPathList(Map<String, String> userEnv, String envKey, String pathList) {
+  protected static void mergeEnvPathList(Map<String, String> userEnv, String envKey, String pathList) {
     if (!isEmpty(pathList)) {
       String current = firstNonEmpty(userEnv.get(envKey), System.getenv(envKey));
       userEnv.put(envKey, join(File.pathSeparator, current, pathList));