mridulm commented on code in PR #45327:
URL: https://github.com/apache/spark/pull/45327#discussion_r1513264898
##########
sql/core/src/test/scala/org/apache/spark/sql/JoinSuite.scala:
##########
@@ -1737,3 +1738,34 @@ class JoinSuite extends QueryTest with
SharedSparkSession with AdaptiveSparkPlan
}
}
}
+
+class ThreadLeakInSortMergeJoinSuite
+ extends QueryTest
+ with SharedSparkSession
+ with AdaptiveSparkPlanHelper {
+
+ setupTestData()
+ override protected def createSparkSession: TestSparkSession = {
+ SparkSession.cleanupAnyExistingSession()
+ new TestSparkSession(
+ sparkConf.set(SHUFFLE_SPILL_NUM_ELEMENTS_FORCE_SPILL_THRESHOLD, 20))
+ }
+
+ test("SPARK-47146: thread leak when doing SortMergeJoin (with spill)") {
+
+ withSQLConf(
+ SQLConf.AUTO_BROADCASTJOIN_THRESHOLD.key -> "1") {
+
+ assertSpilled(sparkContext, "inner join") {
+ sql("SELECT * FROM testData JOIN testData2 ON key = a").collect()
+ System.gc()
+ }
+
+ val readAheadThread = Thread.getAllStackTraces.keySet().asScala
+ .find {
+ _.getName.startsWith("read-ahead")
+ }
+ assert(readAheadThread.isEmpty)
Review Comment:
Thanks for confirming, that was my assessment as well - but wanted to double
check given we faced it very recently :-)
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