Github user dongjoon-hyun commented on the issue: https://github.com/apache/spark/pull/20893 Hi, @vanzin and @sahilTakiar . Could you take a look at `branch-2.3` hadoop-2.6 parts? It dosen't happen for all branches, but it seems to become unstable a little bit. - https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-branch-2.3-test-maven-hadoop-2.6/311/testReport/junit/org.apache.spark.launcher/LauncherServerSuite/testAppHandleDisconnect/history/ (3 serial failures) - https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-branch-2.3-test-sbt-hadoop-2.6/278/ (1 failure)
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