Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/1481#discussion_r15718740
--- Diff:
core/src/main/scala/org/apache/spark/storage/BlockObjectWriter.scala ---
@@ -176,7 +183,9 @@ private[spark] class DiskBlockObjectWriter(
if (!initialized) {
open()
}
+ val prevPos = channel.position()
--- End diff --
this seems like it will have potentially high overhead... this is called
when writing each individual record
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