zeotuan commented on code in PR #46494:
URL: https://github.com/apache/spark/pull/46494#discussion_r1599223748


##########
core/src/main/scala/org/apache/spark/broadcast/TorrentBroadcast.scala:
##########
@@ -278,11 +278,12 @@ private[spark] class TorrentBroadcast[T: ClassTag](obj: 
T, id: Long, serializedO
             }
           case None =>
             val estimatedTotalSize = Utils.bytesToString(numBlocks.toLong * 
blockSize)
-            logInfo(s"Started reading broadcast variable $id with $numBlocks 
pieces " +
-              s"(estimated total size $estimatedTotalSize)")
+            logInfo(log"Started reading broadcast variable ${MDC(BROADCAST_ID, 
id)} with ${MDC(NUM_BROADCAST_BLOCK, numBlocks)} pieces " +
+              log"(estimated total size ${MDC(NUM_BYTES, 
estimatedTotalSize)})")
             val startTimeNs = System.nanoTime()
             val blocks = readBlocks()
-            logInfo(s"Reading broadcast variable $id took 
${Utils.getUsedTimeNs(startTimeNs)}")
+            logInfo(log"Reading broadcast variable ${MDC(BROADCAST_ID, id)}" +
+              log" took ${MDC(TOTAL_TIME, Utils.getUsedTimeNs(startTimeNs))} 
ms")

Review Comment:
   My bad, that is actually ms since `getUsedTimeNs` convert it to ms. But the 
function already provided the unit value



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