| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.hadoop.yarn.server.nodemanager; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerEvent; |
| import org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerImpl; |
| import org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerState; |
| import org.apache.hadoop.yarn.state.StateTransitionListener; |
| |
| /** |
| * Interface to be used by external cluster operators to implement a |
| * State Transition listener that is notified before and after a container |
| * state transition. |
| * NOTE: The pre and post transition callbacks will be made in the synchronized |
| * block as the call to the instrumented transition - Serially, in the |
| * order: preTransition, transition and postTransition. The implementor |
| * must ensure that the callbacks return in a timely manner to avoid |
| * blocking the state-machine. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public interface ContainerStateTransitionListener extends |
| StateTransitionListener<ContainerImpl, ContainerEvent, ContainerState> { |
| |
| /** |
| * Init method which will be invoked by the Node Manager to inject the |
| * NM {@link Context}. |
| * @param context NM Context. |
| */ |
| void init(Context context); |
| } |