| /** |
| * 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.hadoop.yarn.server.nodemanager.nodelabels; |
| |
| import org.apache.hadoop.util.Shell; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Set; |
| import java.util.TimerTask; |
| |
| /** |
| * A node descriptors script runner periodically runs a script, |
| * parses the output to collect desired descriptors, and then |
| * post these descriptors to the given {@link NodeDescriptorsProvider}. |
| * @param <T> a certain type of descriptor. |
| */ |
| public abstract class NodeDescriptorsScriptRunner<T> extends TimerTask { |
| |
| private final static Logger LOG = LoggerFactory |
| .getLogger(NodeDescriptorsScriptRunner.class); |
| |
| private final Shell.ShellCommandExecutor exec; |
| private final NodeDescriptorsProvider provider; |
| |
| public NodeDescriptorsScriptRunner(String scriptPath, |
| String[] scriptArgs, long scriptTimeout, |
| NodeDescriptorsProvider ndProvider) { |
| ArrayList<String> execScript = new ArrayList<>(); |
| execScript.add(scriptPath); |
| if (scriptArgs != null) { |
| execScript.addAll(Arrays.asList(scriptArgs)); |
| } |
| this.provider = ndProvider; |
| this.exec = new Shell.ShellCommandExecutor( |
| execScript.toArray(new String[execScript.size()]), null, null, |
| scriptTimeout); |
| } |
| |
| @Override |
| public void run() { |
| try { |
| exec.execute(); |
| provider.setDescriptors(parseOutput(exec.getOutput())); |
| } catch (Exception e) { |
| if (exec.isTimedOut()) { |
| LOG.warn("Node Labels script timed out, Caught exception : " |
| + e.getMessage(), e); |
| } else { |
| LOG.warn("Execution of Node Labels script failed, Caught exception : " |
| + e.getMessage(), e); |
| } |
| } |
| } |
| |
| public void cleanUp() { |
| if (exec != null) { |
| Process p = exec.getProcess(); |
| if (p != null) { |
| p.destroy(); |
| } |
| } |
| } |
| |
| abstract Set<T> parseOutput(String scriptOutput) throws IOException; |
| } |