Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14201#discussion_r71015601
  
    --- Diff: 
launcher/src/main/java/org/apache/spark/launcher/SparkLauncher.java ---
    @@ -455,6 +555,26 @@ private ProcessBuilder createBuilder() {
         for (Map.Entry<String, String> e : builder.childEnv.entrySet()) {
           pb.environment().put(e.getKey(), e.getValue());
         }
    +
    +    if (workingDir != null) {
    +      pb.directory(workingDir);
    +    }
    +
    +    // Only one of redirectError and redirectError(...) can be specified
    +    if (redirectErrorStream && errorStream != null) {
    --- End diff --
    
    minor: you can use `checkState` (from `CommandBuilderUtils` which is 
already imported).


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