Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/21068#discussion_r185545685
--- Diff:
resource-managers/yarn/src/test/scala/org/apache/spark/deploy/yarn/YarnAllocatorBlacklistTrackerSuite.scala
---
@@ -0,0 +1,144 @@
+/*
+ * 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.deploy.yarn
+
+import java.util.Arrays
+import java.util.Collections
+
+import org.apache.hadoop.yarn.client.api.AMRMClient
+import org.apache.hadoop.yarn.client.api.AMRMClient.ContainerRequest
+import org.mockito.Mockito._
+import org.scalatest.{BeforeAndAfterEach, Matchers}
+
+import org.apache.spark.{SparkConf, SparkFunSuite}
+import
org.apache.spark.deploy.yarn.config.YARN_EXECUTOR_LAUNCH_BLACKLIST_ENABLED
+import org.apache.spark.internal.config.{MAX_FAILED_EXEC_PER_NODE, _}
--- End diff --
you don't need to import `_` and a specific thing as well. Though in this
case, it looks like the only thing you need is `BLACKLIST_TIMEOUT_CONF` so just
import those two explicitly.
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