Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/860#discussion_r13269370
--- Diff: core/src/main/scala/org/apache/spark/storage/BlockManager.scala
---
@@ -1015,8 +1015,26 @@ private[spark] class BlockManager(
bytes: ByteBuffer,
serializer: Serializer = defaultSerializer): Iterator[Any] = {
bytes.rewind()
- val stream = wrapForCompression(blockId, new
ByteBufferInputStream(bytes, true))
- serializer.newInstance().deserializeStream(stream).asIterator
+
+ def doWork() = {
+ val stream = wrapForCompression(blockId, new
ByteBufferInputStream(bytes, true))
+ serializer.newInstance().deserializeStream(stream).asIterator
+ }
+
+ if (blockId.isShuffle) {
+ // Reducer may need to read many local shuffle blocks and will wrap
them into Iterators
+ // at the beginning. The wrapping will cost some memory(compression
instance
--- End diff --
Add space before (
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