diff --git a/graphx/src/main/scala/org/apache/spark/graphx/EdgeRDD.scala b/graphx/src/main/scala/org/apache/spark/graphx/EdgeRDD.scala
index 5bcb96b136ed7..5267560b3e5ce 100644
--- a/graphx/src/main/scala/org/apache/spark/graphx/EdgeRDD.scala
+++ b/graphx/src/main/scala/org/apache/spark/graphx/EdgeRDD.scala
@@ -82,12 +82,17 @@ class EdgeRDD[@specialized ED: ClassTag, VD: ClassTag](
     this
   }
 
-  /** Persists the vertex partitions using `targetStorageLevel`, which defaults to MEMORY_ONLY. */
+  /** Persists the edge partitions using `targetStorageLevel`, which defaults to MEMORY_ONLY. */
   override def cache(): this.type = {
     partitionsRDD.persist(targetStorageLevel)
     this
   }
 
+  /** The number of edges in the RDD. */
+  override def count(): Long = {
+    partitionsRDD.map(_._2.size.toLong).reduce(_ + _)
+  }
+
   private[graphx] def mapEdgePartitions[ED2: ClassTag, VD2: ClassTag](
       f: (PartitionID, EdgePartition[ED, VD]) => EdgePartition[ED2, VD2]): EdgeRDD[ED2, VD2] = {
     this.withPartitionsRDD[ED2, VD2](partitionsRDD.mapPartitions({ iter =>