[jira] [Created] (SPARK-24653) Flaky test "JoinSuite.test SortMergeJoin (with spill)"

["Marcelo Vanzin (JIRA)" <ji...@apache.org>]

Marcelo Vanzin created SPARK-24653:
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             Summary: Flaky test "JoinSuite.test SortMergeJoin (with spill)"
                 Key: SPARK-24653
                 URL: https://issues.apache.org/jira/browse/SPARK-24653
             Project: Spark
          Issue Type: Bug
          Components: Tests
    Affects Versions: 2.4.0
            Reporter: Marcelo Vanzin


We've run into failures in this test in our internal jobs a few times. They look like this:

{noformat}
java.lang.AssertionError: assertion failed: expected full outer join to not spill, but did
      at scala.Predef$.assert(Predef.scala:170)
      at org.apache.spark.TestUtils$.assertNotSpilled(TestUtils.scala:189)
      at org.apache.spark.sql.JoinSuite$$anonfun$23$$anonfun$apply$mcV$sp$16.apply$mcV$sp(JoinSuite.scala:734)
      at org.apache.spark.sql.test.SQLTestUtils$class.withSQLConf(SQLTestUtils.scala:108)
{noformat}

I looked on the riselab jenkins and couldn't find a failure, so filing with a low priority.

I did notice a possible race in the code that could explain the failure. Will send a PR.



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