address arron's comment on inTachyonSize

Author: RongGu

core/src/main/scala/org/apache/spark/storage/BlockManager.scala

@@ -257,7 +257,7 @@ private[spark] class BlockManager(
     if (info.tellMaster) {
       val storageLevel = status.storageLevel
       val inMemSize = Math.max(status.memSize, droppedMemorySize)
-      val inTachyonSize = Math.max(status.tachyonSize, droppedMemorySize)
+      val inTachyonSize = status.tachyonSize
       val onDiskSize = status.diskSize
       master.updateBlockInfo(
         blockManagerId, blockId, storageLevel, inMemSize, onDiskSize, inTachyonSize)

core/src/main/scala/org/apache/spark/storage/BlockManagerMasterActor.scala

@@ -357,7 +357,7 @@ private[spark] class BlockManagerInfo(
     }
 
     if (storageLevel.isValid) {
-      /* isValid means it is either stored in-memory or on-disk.
+      /* isValid means it is either stored in-memory, on-disk or on-Tachyon.
        * But the memSize here indicates the data size in or dropped from memory,
        * tachyonSize here indicates the data size in or dropped from Tachyon,
        * and the diskSize here indicates the data size in or dropped to disk.