Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18073#discussion_r118152566
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFileFormatSuite.scala
---
@@ -26,6 +26,22 @@ import org.apache.spark.sql.test.SharedSQLContext
class ParquetFileFormatSuite extends QueryTest with ParquetTest with
SharedSQLContext {
+ test("Number of threads doesn't grow extremely after parquet file
reading") {
+ withTempDir { dir =>
+ val file = dir.toString + "/file"
+ spark.range(1).toDF("a").coalesce(1).write.parquet(file)
+ spark.read.parquet(file)
+ val numThreadBefore = Thread.activeCount
+ (1 to 100).map { _ =>
+ spark.read.parquet(file)
+ }
+ val numThreadAfter = Thread.activeCount
+ // Hard to test a correct thread number,
+ // but it shouldn't increase more than a reasonable number.
+ assert(numThreadAfter - numThreadBefore < 20)
--- End diff --
after waiting for enough time, can we expect this to be 0?
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