[GitHub] [spark] cloud-fan commented on a change in pull request #27972: [SPARK-31207][CORE] Ensure the total number of blocks to fetch equals to the sum of local/hostLocal/remote blocks

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cloud-fan commented on a change in pull request #27972: [SPARK-31207][CORE] Ensure the total number of blocks to fetch equals to the sum of local/hostLocal/remote blocks
URL: https://github.com/apache/spark/pull/27972#discussion_r396222718
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
 ##########
 @@ -312,19 +310,57 @@ final class ShuffleBlockFetcherIterator(
         hostLocalBlocks ++= blocksForAddress.map(info => (info._1, info._3))
         hostLocalBlockBytes += mergedBlockInfos.map(_.size).sum
       } else {
-        numRemoteBlocks += blockInfos.size
         remoteBlockBytes += blockInfos.map(_._2).sum
         collectFetchRequests(address, blockInfos, collectedRemoteRequests)
       }
     }
+    val numRemoteBlocks = collectedRemoteRequests.map(_.blocks.size).sum
     val totalBytes = localBlockBytes + remoteBlockBytes + hostLocalBlockBytes
+    assert(numBlocksToFetch == localBlocks.size + hostLocalBlocks.size + numRemoteBlocks,
+      s"The number of non-empty blocks $numBlocksToFetch doesn't equal to the number of local " +
+        s"blocks ${localBlocks.size} + the number of host-local blocks ${hostLocalBlocks.size} " +
+        s"+ the number of remote blocks ${numRemoteBlocks}.")
     logInfo(s"Getting $numBlocksToFetch (${Utils.bytesToString(totalBytes)}) non-empty blocks " +
       s"including ${localBlocks.size} (${Utils.bytesToString(localBlockBytes)}) local and " +
       s"${hostLocalBlocks.size} (${Utils.bytesToString(hostLocalBlockBytes)}) " +
       s"host-local and $numRemoteBlocks (${Utils.bytesToString(remoteBlockBytes)}) remote blocks")
     collectedRemoteRequests
   }
 
+  def createFetchRequest(
+      blocks: Seq[FetchBlockInfo],
+      address: BlockManagerId,
+      curRequestSize: Long): FetchRequest = {
+    logDebug(s"Creating fetch request of $curRequestSize at $address "
+      + s"with ${blocks.size} blocks")
+    FetchRequest(address, blocks)
+  }
+
+  def createFetchRequests(
+      curBlocks: ArrayBuffer[FetchBlockInfo],
 
 Review comment:
   does this parameter have to be an `ArrayBuffer` here? We don't mutate it in this method.

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