[GitHub] [spark] otterc commented on a diff in pull request #38333: [SPARK-40872] Fallback to original shuffle block when a push-merged shuffle chunk is zero-size

[GitBox <gi...@apache.org>]

otterc commented on code in PR #38333:
URL: https://github.com/apache/spark/pull/38333#discussion_r1012336511


##########
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala:
##########
@@ -794,7 +794,15 @@ final class ShuffleBlockFetcherIterator(
             // since the last call.
             val msg = s"Received a zero-size buffer for block $blockId from $address " +
               s"(expectedApproxSize = $size, isNetworkReqDone=$isNetworkReqDone)"
-            throwFetchFailedException(blockId, mapIndex, address, new IOException(msg))
+            if (blockId.isShuffleChunk) {
+              logWarning(msg)
+              pushBasedFetchHelper.initiateFallbackFetchForPushMergedBlock(blockId, address)

Review Comment:
   What is the size that is returned in the meta request? 



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