Github user mccheah commented on a diff in the pull request:
https://github.com/apache/spark/pull/21366#discussion_r194535271
--- Diff:
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/scheduler/cluster/k8s/ExecutorPodsSnapshotsStoreImpl.scala
---
@@ -0,0 +1,95 @@
+/*
+ * 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.cluster.k8s
+
+import java.util.concurrent.{ExecutorService, ScheduledExecutorService,
TimeUnit}
+
+import com.google.common.collect.Lists
+import io.fabric8.kubernetes.api.model.Pod
+import io.reactivex.disposables.Disposable
+import io.reactivex.functions.Consumer
+import io.reactivex.schedulers.Schedulers
+import io.reactivex.subjects.PublishSubject
+import javax.annotation.concurrent.GuardedBy
+import scala.collection.JavaConverters._
+import scala.collection.mutable
+
+import org.apache.spark.util.{ThreadUtils, Utils}
+
+private[spark] class ExecutorPodsSnapshotsStoreImpl(
--- End diff --
Prefer an impl class here because we also implement a test-only version in
https://github.com/apache/spark/pull/21366/files#diff-ac93ac5a7a34f600bb942c7feb092924
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