attilapiros commented on a change in pull request #25299: [SPARK-27651][Core]
Avoid the network when shuffle blocks are fetched from the same host
URL: https://github.com/apache/spark/pull/25299#discussion_r314388565
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File path:
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
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@@ -379,6 +452,13 @@ final class ShuffleBlockFetcherIterator(
// Get Local Blocks
fetchLocalBlocks()
logDebug(s"Got local blocks in ${Utils.getUsedTimeNs(startTimeNs)}")
+
+ // Get Host-local Blocks
+ if (hostLocalBlocks.nonEmpty) {
+ val hostLocalStartTimeNs = System.nanoTime()
+ fetchHostLocalBlocks()
Review comment:
It is a good catch. Thanks! Fixed and a unit test is added for this case.
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