Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/10376#discussion_r49662046
--- Diff:
core/src/test/scala/org/apache/spark/shuffle/sort/BypassMergeSortShuffleWriterSuite.scala
---
@@ -169,6 +170,41 @@ class BypassMergeSortShuffleWriterSuite extends
SparkFunSuite with BeforeAndAfte
assert(taskMetrics.memoryBytesSpilled === 0)
}
+ test("only generate temp shuffle file for non-empty partition") {
+ // Using exception to test whether only non-empty partition creates
temp shuffle file,
--- End diff --
`temporaryFilesCreated` is only cleared in `afterAll()`, so it should
contain every file which was created even after those files are deleted from
the disk. Thus, I think we can simplify this test a bit by not relying on the
exception here: just check that `temporaryFilesCreated.size === 3` while
`temporaryFilesCreated.count(_.exists()) === 0` after a successful stop.
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