cloud-fan commented on a change in pull request #26930: [SPARK-30290][Core]
Count for merged block when fetching continuous blocks in batch
URL: https://github.com/apache/spark/pull/26930#discussion_r361089166
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File path:
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
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@@ -337,14 +337,25 @@ final class ShuffleBlockFetcherIterator(
assertPositiveBlockSize(blockId, size)
curBlocks += FetchBlockInfo(blockId, size, mapIndex)
curRequestSize += size
- if (curRequestSize >= targetRemoteRequestSize ||
- curBlocks.size >= maxBlocksInFlightPerAddress) {
+ // For batch fetch, the actual block in flight should count for merged
block.
+ val exceedsMaxBlocksInFlightPerAddress = !doBatchFetch &&
+ curBlocks.size >= maxBlocksInFlightPerAddress
+ if (curRequestSize >= targetRemoteRequestSize ||
exceedsMaxBlocksInFlightPerAddress) {
// Add this FetchRequest
val mergedBlocks = mergeContinuousShuffleBlockIdsIfNeeded(curBlocks)
- collectedRemoteRequests += new FetchRequest(address, mergedBlocks)
- logDebug(s"Creating fetch request of $curRequestSize at $address "
- + s"with ${mergedBlocks.size} blocks")
+ .grouped(maxBlocksInFlightPerAddress)
curBlocks = new ArrayBuffer[FetchBlockInfo]
+ mergedBlocks.foreach { mergedBlock =>
+ if (mergedBlock.size == maxBlocksInFlightPerAddress) {
+ collectedRemoteRequests += new FetchRequest(address, mergedBlock)
+ logDebug(s"Creating fetch request of $curRequestSize at $address "
+ + s"with ${mergedBlock.size} blocks")
+ } else {
+ // The last group might not exceed `maxBlocksInFlightPerAddress`.
Put it back
Review comment:
when we reach here, it's not `might not exceed`, it's `does not exceed`
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