diff --git a/core/src/main/scala/org/apache/spark/storage/BlockManagerMasterEndpoint.scala b/core/src/main/scala/org/apache/spark/storage/BlockManagerMasterEndpoint.scala
index 467c3e0e6b51f..6f85b9e4d6c73 100644
--- a/core/src/main/scala/org/apache/spark/storage/BlockManagerMasterEndpoint.scala
+++ b/core/src/main/scala/org/apache/spark/storage/BlockManagerMasterEndpoint.scala
@@ -497,11 +497,17 @@ private[spark] class BlockManagerInfo(
 
     updateLastSeenMs()
 
-    if (_blocks.containsKey(blockId)) {
+    val blockExists = _blocks.containsKey(blockId)
+    var originalMemSize: Long = 0
+    var originalDiskSize: Long = 0
+    var originalLevel: StorageLevel = StorageLevel.NONE
+
+    if (blockExists) {
       // The block exists on the slave already.
       val blockStatus: BlockStatus = _blocks.get(blockId)
-      val originalLevel: StorageLevel = blockStatus.storageLevel
-      val originalMemSize: Long = blockStatus.memSize
+      originalLevel = blockStatus.storageLevel
+      originalMemSize = blockStatus.memSize
+      originalDiskSize = blockStatus.diskSize
 
       if (originalLevel.useMemory) {
         _remainingMem += originalMemSize
@@ -520,32 +526,44 @@ private[spark] class BlockManagerInfo(
         blockStatus = BlockStatus(storageLevel, memSize = memSize, diskSize = 0)
         _blocks.put(blockId, blockStatus)
         _remainingMem -= memSize
-        logInfo("Added %s in memory on %s (size: %s, free: %s)".format(
-          blockId, blockManagerId.hostPort, Utils.bytesToString(memSize),
-          Utils.bytesToString(_remainingMem)))
+        if (blockExists) {
+          logInfo(s"Updated $blockId in memory on ${blockManagerId.hostPort}" +
+            s" (current size: ${Utils.bytesToString(memSize)}," +
+            s" original size: ${Utils.bytesToString(originalMemSize)}," +
+            s" free: ${Utils.bytesToString(_remainingMem)})")
+        } else {
+          logInfo(s"Added $blockId in memory on ${blockManagerId.hostPort}" +
+            s" (size: ${Utils.bytesToString(memSize)}," +
+            s" free: ${Utils.bytesToString(_remainingMem)})")
+        }
       }
       if (storageLevel.useDisk) {
         blockStatus = BlockStatus(storageLevel, memSize = 0, diskSize = diskSize)
         _blocks.put(blockId, blockStatus)
-        logInfo("Added %s on disk on %s (size: %s)".format(
-          blockId, blockManagerId.hostPort, Utils.bytesToString(diskSize)))
+        if (blockExists) {
+          logInfo(s"Updated $blockId on disk on ${blockManagerId.hostPort}" +
+            s" (current size: ${Utils.bytesToString(diskSize)}," +
+            s" original size: ${Utils.bytesToString(originalDiskSize)})")
+        } else {
+          logInfo(s"Added $blockId on disk on ${blockManagerId.hostPort}" +
+            s" (size: ${Utils.bytesToString(diskSize)})")
+        }
       }
       if (!blockId.isBroadcast && blockStatus.isCached) {
         _cachedBlocks += blockId
       }
-    } else if (_blocks.containsKey(blockId)) {
+    } else if (blockExists) {
       // If isValid is not true, drop the block.
-      val blockStatus: BlockStatus = _blocks.get(blockId)
       _blocks.remove(blockId)
       _cachedBlocks -= blockId
-      if (blockStatus.storageLevel.useMemory) {
-        logInfo("Removed %s on %s in memory (size: %s, free: %s)".format(
-          blockId, blockManagerId.hostPort, Utils.bytesToString(blockStatus.memSize),
-          Utils.bytesToString(_remainingMem)))
+      if (originalLevel.useMemory) {
+        logInfo(s"Removed $blockId on ${blockManagerId.hostPort} in memory" +
+          s" (size: ${Utils.bytesToString(originalMemSize)}," +
+          s" free: ${Utils.bytesToString(_remainingMem)})")
       }
-      if (blockStatus.storageLevel.useDisk) {
-        logInfo("Removed %s on %s on disk (size: %s)".format(
-          blockId, blockManagerId.hostPort, Utils.bytesToString(blockStatus.diskSize)))
+      if (originalLevel.useDisk) {
+        logInfo(s"Removed $blockId on ${blockManagerId.hostPort} on disk" +
+          s" (size: ${Utils.bytesToString(originalDiskSize)})")
       }
     }
   }