Ngone51 commented on a change in pull request #28746:
URL: https://github.com/apache/spark/pull/28746#discussion_r436445018
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File path: core/src/main/scala/org/apache/spark/deploy/LocalSparkCluster.scala
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@@ -74,6 +74,10 @@ class LocalSparkCluster(
def stop(): Unit = {
logInfo("Shutting down local Spark cluster.")
+ // SPARK-31922: wait one more second before shutting down rpcEnvs of
master and worker,
+ // in order to let the cluster have time to handle the
`UnregisterApplication` message.
+ // Otherwise, we could hit "RpcEnv already stopped" error.
+ Thread.sleep(1000)
// Stop the workers before the master so they don't get upset that it
disconnected
workerRpcEnvs.foreach(_.shutdown())
Review comment:
It's not really necessary since shutdown is performed in a
synchronization way. Therefore, the worker will close the connection to the
master firstly. And `awaitTermination()` doesn't make sure everything stops but
only the `Dispather`.
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