Merge pull request apache#484 from tdas/run-example-fix

Made run-example respect SPARK_JAVA_OPTS and SPARK_MEM.

bin/run-example scripts was not passing Java properties set through the SPARK_JAVA_OPTS to the example. This is important for examples like Twitter** as the Twitter authentication information must be set through java properties. Hence added the same JAVA_OPTS code in run-example as it is in bin/spark-class script.

Also added SPARK_MEM, in case someone wants to run the example with different amounts of memory. This can be removed if it is not tune with the intended semantics of the run-example scripts.

@matei Please check this soon I want this to go in 0.9-rc4

bin/run-example

@@ -76,11 +76,20 @@ else
   fi
 fi
 
+# Set JAVA_OPTS to be able to load native libraries and to set heap size
+JAVA_OPTS="$SPARK_JAVA_OPTS"
+JAVA_OPTS="$JAVA_OPTS -Djava.library.path=$SPARK_LIBRARY_PATH"
+# Load extra JAVA_OPTS from conf/java-opts, if it exists
+if [ -e "$FWDIR/conf/java-opts" ] ; then
+  JAVA_OPTS="$JAVA_OPTS `cat $FWDIR/conf/java-opts`"
+fi
+export JAVA_OPTS
+
 if [ "$SPARK_PRINT_LAUNCH_COMMAND" == "1" ]; then
   echo -n "Spark Command: "
-  echo "$RUNNER" -cp "$CLASSPATH" "$@"
+  echo "$RUNNER" -cp "$CLASSPATH" $JAVA_OPTS "$@"
   echo "========================================"
   echo
 fi
 
-exec "$RUNNER" -cp "$CLASSPATH" "$@"
+exec "$RUNNER" -cp "$CLASSPATH" $JAVA_OPTS "$@"