| /** |
| * 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 java.io.File; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Set; |
| import java.util.Timer; |
| import java.util.TimerTask; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileUtil; |
| import org.apache.hadoop.util.Shell.ShellCommandExecutor; |
| import org.apache.hadoop.yarn.api.records.NodeLabel; |
| import org.apache.hadoop.yarn.conf.YarnConfiguration; |
| |
| /** |
| * The class which provides functionality of getting the labels of the node |
| * using the configured node labels provider script. "NODE_PARTITION:" is the |
| * pattern which will be used to search node label partition from the out put of |
| * the NodeLabels provider script |
| */ |
| public class ScriptBasedNodeLabelsProvider extends AbstractNodeLabelsProvider { |
| /** Absolute path to the node labels script. */ |
| private String nodeLabelsScriptPath; |
| |
| /** Time after which the script should be timed out */ |
| private long scriptTimeout; |
| |
| /** ShellCommandExecutor used to execute monitoring script */ |
| ShellCommandExecutor shexec = null; |
| |
| /** Pattern used for searching in the output of the node labels script */ |
| public static final String NODE_LABEL_PARTITION_PATTERN = "NODE_PARTITION:"; |
| |
| private String[] scriptArgs; |
| |
| public ScriptBasedNodeLabelsProvider() { |
| super(ScriptBasedNodeLabelsProvider.class.getName()); |
| } |
| |
| /* |
| * Method which initializes the values for the script path and interval time. |
| */ |
| @Override |
| protected void serviceInit(Configuration conf) throws Exception { |
| super.serviceInit(conf); |
| this.nodeLabelsScriptPath = |
| conf.get(YarnConfiguration.NM_SCRIPT_BASED_NODE_LABELS_PROVIDER_PATH); |
| this.scriptTimeout = |
| conf.getLong(YarnConfiguration.NM_NODE_LABELS_PROVIDER_FETCH_TIMEOUT_MS, |
| YarnConfiguration.DEFAULT_NM_NODE_LABELS_PROVIDER_FETCH_TIMEOUT_MS); |
| scriptArgs = conf.getStrings( |
| YarnConfiguration.NM_SCRIPT_BASED_NODE_LABELS_PROVIDER_SCRIPT_OPTS, |
| new String[] {}); |
| |
| verifyConfiguredScript(); |
| } |
| |
| /** |
| * Method used to determine if or not node labels fetching script is |
| * configured and whether it is fit to run. Returns true if following |
| * conditions are met: |
| * |
| * <ol> |
| * <li>Path to Node Labels fetch script is not empty</li> |
| * <li>Node Labels fetch script file exists</li> |
| * </ol> |
| * |
| * @throws IOException |
| */ |
| private void verifyConfiguredScript() |
| throws IOException { |
| boolean invalidConfiguration = false; |
| if (nodeLabelsScriptPath == null |
| || nodeLabelsScriptPath.trim().isEmpty()) { |
| invalidConfiguration = true; |
| } else { |
| File f = new File(nodeLabelsScriptPath); |
| invalidConfiguration = !f.exists() || !FileUtil.canExecute(f); |
| } |
| if (invalidConfiguration) { |
| throw new IOException( |
| "Distributed Node labels provider script \"" + nodeLabelsScriptPath |
| + "\" is not configured properly. Please check whether the script " |
| + "path exists, owner and the access rights are suitable for NM " |
| + "process to execute it"); |
| } |
| } |
| |
| /** |
| * Method used to terminate the Node Labels Fetch script. |
| */ |
| @Override |
| public void cleanUp() { |
| if (shexec != null) { |
| Process p = shexec.getProcess(); |
| if (p != null) { |
| p.destroy(); |
| } |
| } |
| } |
| |
| @Override |
| public TimerTask createTimerTask() { |
| return new NodeLabelsScriptRunner(); |
| } |
| |
| /** |
| * Class which is used by the {@link Timer} class to periodically execute the |
| * node labels script. |
| */ |
| private class NodeLabelsScriptRunner extends TimerTask { |
| |
| private final Logger LOG = |
| LoggerFactory.getLogger(NodeLabelsScriptRunner.class); |
| |
| public NodeLabelsScriptRunner() { |
| ArrayList<String> execScript = new ArrayList<String>(); |
| execScript.add(nodeLabelsScriptPath); |
| if (scriptArgs != null) { |
| execScript.addAll(Arrays.asList(scriptArgs)); |
| } |
| shexec = new ShellCommandExecutor( |
| execScript.toArray(new String[execScript.size()]), null, null, |
| scriptTimeout); |
| } |
| |
| @Override |
| public void run() { |
| try { |
| shexec.execute(); |
| setNodeLabels(fetchLabelsFromScriptOutput(shexec.getOutput())); |
| } catch (Exception e) { |
| if (shexec.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); |
| } |
| } |
| } |
| |
| /** |
| * Method which collect lines from the output string which begins with |
| * Patterns provided. |
| * |
| * @param scriptOutput string |
| * @return true if output string has error pattern in it. |
| * @throws IOException |
| */ |
| private Set<NodeLabel> fetchLabelsFromScriptOutput(String scriptOutput) |
| throws IOException { |
| String nodePartitionLabel = null; |
| String[] splits = scriptOutput.split("\n"); |
| for (String line : splits) { |
| String trimmedLine = line.trim(); |
| if (trimmedLine.startsWith(NODE_LABEL_PARTITION_PATTERN)) { |
| nodePartitionLabel = |
| trimmedLine.substring(NODE_LABEL_PARTITION_PATTERN.length()); |
| } |
| } |
| return convertToNodeLabelSet(nodePartitionLabel); |
| } |
| } |
| } |