using apache commons to safely remove directory; previous version was unsafe
diff --git a/hyracks/hyracks-dataflow-std/pom.xml b/hyracks/hyracks-dataflow-std/pom.xml
index 56046f7..8e67891 100644
--- a/hyracks/hyracks-dataflow-std/pom.xml
+++ b/hyracks/hyracks-dataflow-std/pom.xml
@@ -45,5 +45,10 @@
   		<type>jar</type>
   		<scope>test</scope>
   	</dependency>
+  	<dependency>
+  		<groupId>commons-io</groupId>
+  		<artifactId>commons-io</artifactId>
+  		<version>2.4</version>
+  	</dependency>
   </dependencies>
 </project>
diff --git a/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/file/FileRemoveOperatorDescriptor.java b/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/file/FileRemoveOperatorDescriptor.java
index 0df15e9..bf7ff33 100644
--- a/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/file/FileRemoveOperatorDescriptor.java
+++ b/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/file/FileRemoveOperatorDescriptor.java
@@ -16,6 +16,9 @@
 package edu.uci.ics.hyracks.dataflow.std.file;
 
 import java.io.File;
+import java.io.IOException;
+
+import org.apache.commons.io.FileUtils;
 
 import edu.uci.ics.hyracks.api.comm.IFrameWriter;
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
@@ -52,20 +55,11 @@
             @Override
             public void initialize() throws HyracksDataException {
                 File f = split.getLocalFile().getFile();
-                delete(f);
-            }
-
-            private void delete(File root) {
-                if (root.isDirectory()) {
-                    for (File f : root.listFiles()) {
-                        if (f.isDirectory()) {
-                            delete(f);
-                        } else {
-                            f.delete();
-                        }
-                    }
+                try {
+                    FileUtils.deleteDirectory(f);
+                } catch (IOException e) {
+                    throw new HyracksDataException(e);
                 }
-                root.delete();
             }
 
             @Override