Add print statements to debug MemoryStore

core/src/main/scala/org/apache/spark/storage/memory/MemoryStore.scala

@@ -399,9 +399,13 @@ private[spark] class MemoryStore(
       val origEntry = entries.get(blockId)
       print("Hello, world!\n")
       logInfo(s"blockId: $blockId")
+      print("402\n")
       if (origEntry != null) {
+        print("404\n")
         blockIdAndSizeSet -= new OurBlockIdAndSizeType(blockId, origEntry.size)
+        print("406\n")
       }
+      print("408\n")
       entries.remove(blockId)
     }
     if (entry != null) {