Update ExternalAppendOnlyMap.scala

Author: wangfei

core/src/main/scala/org/apache/spark/util/collection/ExternalAppendOnlyMap.scala

@@ -76,16 +76,12 @@ class ExternalAppendOnlyMap[K, V, C](
   private val maxMemoryThreshold = {
     val memoryFraction = sparkConf.getDouble("spark.shuffle.memoryFraction", 0.3)
     val safetyFraction = sparkConf.getDouble("spark.shuffle.safetyFraction", 0.8)
-
-    if (memoryFraction > 1 && memoryFraction <= 0) {
+    if (memoryFraction > 1 && memoryFraction < 0) {
       throw new Exception("spark.shuffle.memoryFraction should be between 0 and 1.")
     }
-
-    if (safetyFraction > 1 && safetyFraction <= 0) {
+    if (safetyFraction > 1 && safetyFraction < 0) {
       throw new Exception("spark.shuffle.safetyFraction should be between 0 and 1.")
     }
-
-
     (Runtime.getRuntime.maxMemory * memoryFraction * safetyFraction).toLong
   }