Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/43#discussion_r10226983
--- Diff:
core/src/main/scala/org/apache/spark/storage/BlockFetcherIterator.scala ---
@@ -146,6 +146,12 @@ object BlockFetcherIterator {
}
protected def splitLocalRemoteBlocks(): ArrayBuffer[FetchRequest] = {
+ // Make remote requests at most maxBytesInFlight / 5 in length; the
reason to keep them
+ // smaller than maxBytesInFlight is to allow multiple, parallel
fetches from up to 5
+ // nodes, rather than blocking on reading output from one node.
+ val maxRequestSize = math.max(maxBytesInFlight / 5, 1L)
--- End diff --
if you look at the code, this is used as a threshold where if the size gets
larger than this it truncates the current request and creates a new one. I
think the name was just wrong. Also even with my change it's *sort of* wrong
because in fact the request size may be slightly larger than this.
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