[GitHub] [samza] rmatharu commented on a change in pull request #1180: Samza-2340 Introduce ContainerManager for handling validation for failures & starts of active & standby containers

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rmatharu commented on a change in pull request #1180: Samza-2340 Introduce ContainerManager for handling validation for failures & starts of active & standby containers
URL: https://github.com/apache/samza/pull/1180#discussion_r334107627
 
 

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 File path: samza-core/src/main/java/org/apache/samza/clustermanager/ContainerManager.java
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+/*
+ * 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.samza.clustermanager;
+
+import com.google.common.annotations.VisibleForTesting;
+import java.time.Duration;
+import java.util.Optional;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * ContainerManager is a centralized entity that manages control actions like start, stop for both active and standby containers
+ * ContainerManager acts as a brain for validating and issuing any actions on containers in the Job Coordinator.
+ *
+ * The requests to allocate resources resources made by {@link ContainerAllocator} can either expire or succeed.
+ * When the requests succeeds the ContainerManager validates those requests before starting the container
+ * When the requests expires the ContainerManager decides the next set of actions for the pending request.
+ *
+ * Callbacks issued from  {@link ClusterResourceManager} aka {@link ContainerProcessManager} are intercepted
+ * by ContainerManager to handle container failure and completions for both active and standby containers
+ */
+public class ContainerManager {
+
+  private static final Logger LOG = LoggerFactory.getLogger(ContainerManager.class);
+
+  /**
+   * Resource-manager, used to stop containers
+   */
+  private ClusterResourceManager clusterResourceManager;
 
 Review comment:
   can this and standbyContainerManager be made final?

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