cloud-fan commented on a change in pull request #19788: [SPARK-9853][Core]
Optimize shuffle fetch of contiguous partition IDs
URL: https://github.com/apache/spark/pull/19788#discussion_r242537648
##########
File path:
core/src/main/scala/org/apache/spark/shuffle/IndexShuffleBlockResolver.scala
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@@ -202,13 +202,21 @@ private[spark] class IndexShuffleBlockResolver(
// class of issue from re-occurring in the future which is why they are
left here even though
// SPARK-22982 is fixed.
val channel = Files.newByteChannel(indexFile.toPath)
- channel.position(blockId.reduceId * 8L)
val in = new DataInputStream(Channels.newInputStream(channel))
try {
+ channel.position(blockId.reduceId * 8)
val offset = in.readLong()
+ var expectedPosition = 0
+ blockId match {
Review comment:
or even better
```
val numBlocks = blockId match {
case ContinuousShuffleBlockId => ...
case _ => 1
}
```
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