10110346 commented on a change in pull request #23695:
[SPARK-26780][CORE]Improve shuffle read using ReadAheadInputStream
URL: https://github.com/apache/spark/pull/23695#discussion_r281491320
##########
File path:
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
##########
@@ -474,6 +475,12 @@ final class ShuffleBlockFetcherIterator(
// TODO: manage the memory used here, and spill it into disk in
case of OOM.
Utils.copyStream(input, out, closeStreams = true)
input = out.toChunkedByteBuffer.toInputStream(dispose = true)
+ } else {
+ val readAheadEnabled = SparkEnv.get != null &&
+ SparkEnv.get.conf.get(config.SHUFFLE_READ_AHEAD)
+ if (readAheadEnabled) {
+ input = new ReadAheadInputStream(input, 1024 * 1024)
Review comment:
Thanks all, I think @attilapiros 's advice is better.
I've tried 1M, 2M, 4M sizes, however, no significant performance differences
were observed.
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