Github user ericvandenbergfb commented on a diff in the pull request: https://github.com/apache/spark/pull/18791#discussion_r130743830 --- Diff: core/src/test/scala/org/apache/spark/deploy/history/FsHistoryProviderSuite.scala --- @@ -134,7 +134,8 @@ class FsHistoryProviderSuite extends SparkFunSuite with BeforeAndAfter with Matc // setReadable(...) does not work on Windows. Please refer JDK-6728842. assume(!Utils.isWindows) - class TestFsHistoryProvider extends FsHistoryProvider(createTestConf()) { + class TestFsHistoryProvider extends FsHistoryProvider( + createTestConf().set("spark.testing", "true")) { --- End diff -- The test suite refused to pass on my machine so decided to fix it. Mentioned in commit comments... Fixed race condition in a test (SPARK-3697: ignore files that cannot be read.) where the number of mergeApplicationListings could be more than 1 since the FsHistoryProvider would spin up an executor that also calls checkForLogs in parallel with the test unless spark.testing=true configured.
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