Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19041#discussion_r163055034
--- Diff:
core/src/test/scala/org/apache/spark/scheduler/CacheRecoveryIntegrationSuite.scala
---
@@ -0,0 +1,136 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.scheduler
+
+import scala.util.Try
+
+import org.scalatest.{BeforeAndAfterEach, Matchers}
+import org.scalatest.concurrent.Eventually
+import org.scalatest.time.{Seconds, Span}
+
+import org.apache.spark.{SparkConf, SparkContext, SparkFunSuite, TestUtils}
+import org.apache.spark.internal.config._
+import org.apache.spark.network.TransportContext
+import org.apache.spark.network.netty.SparkTransportConf
+import org.apache.spark.network.server.TransportServer
+import org.apache.spark.network.shuffle.ExternalShuffleBlockHandler
+import org.apache.spark.rdd.RDD
+import org.apache.spark.storage._
+
+class CacheRecoveryIntegrationSuite
--- End diff --
I'm not too sure about what this suite is testing. You seem to be relying
on the very short idle timeout to have the executors killed; but it doesn't
seem like there a strong relation between your test code and which / how many
executors will be killed as idle.
Instead, shouldn't you explicitly be killing executors to verify that the
data is being replicated?
Or at least explain in a comment how this test is actually testing the
functionality being added.
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