Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6423#discussion_r31093987
--- Diff:
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
---
@@ -29,6 +30,16 @@ import org.apache.spark.serializer.{SerializerInstance,
Serializer}
import org.apache.spark.util.{CompletionIterator, Utils}
/**
+ * Factory class that creates iterators to read records from fetched blocks
--- End diff --
To help me understand this patch's motivation a little better, it would be
nice if this contained a paragraph explaining what a typical implementation of
this might do (e.g. wrap a stream in a serializer) and to maybe provide one
example of something that a custom implementation could do.
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