[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | |
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| 19 | package org.apache.hadoop.util; |
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| 20 | |
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| 21 | import java.io.BufferedReader; |
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| 22 | import java.io.File; |
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| 23 | import java.io.FileNotFoundException; |
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| 24 | import java.io.FileReader; |
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| 25 | import java.io.IOException; |
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| 26 | import java.util.ArrayList; |
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| 27 | import java.util.List; |
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| 28 | import java.util.Map; |
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| 29 | import java.util.HashMap; |
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| 30 | import java.util.regex.Matcher; |
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| 31 | import java.util.regex.Pattern; |
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| 32 | import java.util.Arrays; |
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| 33 | import java.util.LinkedList; |
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| 34 | |
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| 35 | import org.apache.commons.logging.Log; |
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| 36 | import org.apache.commons.logging.LogFactory; |
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| 37 | |
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| 38 | import org.apache.hadoop.util.Shell.ExitCodeException; |
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| 39 | import org.apache.hadoop.util.Shell.ShellCommandExecutor; |
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| 40 | |
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| 41 | /** |
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| 42 | * A Proc file-system based ProcessTree. Works only on Linux. |
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| 43 | */ |
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| 44 | public class ProcfsBasedProcessTree { |
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| 45 | |
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| 46 | private static final Log LOG = LogFactory |
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| 47 | .getLog("org.apache.hadoop.mapred.ProcfsBasedProcessTree"); |
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| 48 | |
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| 49 | private static final String PROCFS = "/proc/"; |
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| 50 | public static final long DEFAULT_SLEEPTIME_BEFORE_SIGKILL = 5000L; |
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| 51 | private long sleepTimeBeforeSigKill = DEFAULT_SLEEPTIME_BEFORE_SIGKILL; |
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| 52 | private static final Pattern PROCFS_STAT_FILE_FORMAT = Pattern |
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| 53 | .compile("^([0-9-]+)\\s([^\\s]+)\\s[^\\s]\\s([0-9-]+)\\s([0-9-]+)\\s([0-9-]+)\\s([0-9-]+\\s){16}([0-9]+)(\\s[0-9-]+){16}"); |
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| 54 | |
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| 55 | // to enable testing, using this variable which can be configured |
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| 56 | // to a test directory. |
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| 57 | private String procfsDir; |
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| 58 | |
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| 59 | private Integer pid = -1; |
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| 60 | |
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| 61 | private Map<Integer, ProcessInfo> processTree = new HashMap<Integer, ProcessInfo>(); |
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| 62 | |
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| 63 | public ProcfsBasedProcessTree(String pid) { |
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| 64 | this(pid, PROCFS); |
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| 65 | } |
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| 66 | |
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| 67 | public ProcfsBasedProcessTree(String pid, String procfsDir) { |
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| 68 | this.pid = getValidPID(pid); |
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| 69 | this.procfsDir = procfsDir; |
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| 70 | } |
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| 71 | |
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| 72 | public void setSigKillInterval(long interval) { |
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| 73 | sleepTimeBeforeSigKill = interval; |
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| 74 | } |
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| 75 | |
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| 76 | /** |
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| 77 | * Checks if the ProcfsBasedProcessTree is available on this system. |
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| 78 | * |
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| 79 | * @return true if ProcfsBasedProcessTree is available. False otherwise. |
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| 80 | */ |
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| 81 | public static boolean isAvailable() { |
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| 82 | try { |
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| 83 | String osName = System.getProperty("os.name"); |
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| 84 | if (!osName.startsWith("Linux")) { |
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| 85 | LOG.info("ProcfsBasedProcessTree currently is supported only on " |
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| 86 | + "Linux."); |
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| 87 | return false; |
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| 88 | } |
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| 89 | } catch (SecurityException se) { |
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| 90 | LOG.warn("Failed to get Operating System name. " + se); |
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| 91 | return false; |
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| 92 | } |
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| 93 | return true; |
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| 94 | } |
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| 95 | |
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| 96 | /** |
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| 97 | * Get the process-tree with latest state. If the root-process is not alive, |
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| 98 | * an empty tree will be returned. |
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| 99 | * |
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| 100 | * @return the process-tree with latest state. |
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| 101 | */ |
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| 102 | public ProcfsBasedProcessTree getProcessTree() { |
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| 103 | if (pid != -1) { |
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| 104 | // Get the list of processes |
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| 105 | List<Integer> processList = getProcessList(); |
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| 106 | |
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| 107 | Map<Integer, ProcessInfo> allProcessInfo = new HashMap<Integer, ProcessInfo>(); |
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| 108 | |
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| 109 | // cache the processTree to get the age for processes |
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| 110 | Map<Integer, ProcessInfo> oldProcs = |
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| 111 | new HashMap<Integer, ProcessInfo>(processTree); |
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| 112 | processTree.clear(); |
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| 113 | |
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| 114 | ProcessInfo me = null; |
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| 115 | for (Integer proc : processList) { |
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| 116 | // Get information for each process |
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| 117 | ProcessInfo pInfo = new ProcessInfo(proc); |
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| 118 | if (constructProcessInfo(pInfo, procfsDir) != null) { |
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| 119 | allProcessInfo.put(proc, pInfo); |
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| 120 | if (proc.equals(this.pid)) { |
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| 121 | me = pInfo; // cache 'me' |
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| 122 | processTree.put(proc, pInfo); |
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| 123 | } |
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| 124 | } |
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| 125 | } |
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| 126 | |
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| 127 | if (me == null) { |
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| 128 | return this; |
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| 129 | } |
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| 130 | |
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| 131 | // Add each process to its parent. |
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| 132 | for (Map.Entry<Integer, ProcessInfo> entry : allProcessInfo.entrySet()) { |
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| 133 | Integer pID = entry.getKey(); |
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| 134 | if (pID != 1) { |
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| 135 | ProcessInfo pInfo = entry.getValue(); |
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| 136 | ProcessInfo parentPInfo = allProcessInfo.get(pInfo.getPpid()); |
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| 137 | if (parentPInfo != null) { |
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| 138 | parentPInfo.addChild(pInfo); |
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| 139 | } |
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| 140 | } |
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| 141 | } |
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| 142 | |
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| 143 | // now start constructing the process-tree |
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| 144 | LinkedList<ProcessInfo> pInfoQueue = new LinkedList<ProcessInfo>(); |
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| 145 | pInfoQueue.addAll(me.getChildren()); |
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| 146 | while (!pInfoQueue.isEmpty()) { |
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| 147 | ProcessInfo pInfo = pInfoQueue.remove(); |
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| 148 | if (!processTree.containsKey(pInfo.getPid())) { |
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| 149 | processTree.put(pInfo.getPid(), pInfo); |
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| 150 | } |
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| 151 | pInfoQueue.addAll(pInfo.getChildren()); |
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| 152 | } |
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| 153 | |
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| 154 | // update age values. |
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| 155 | for (Map.Entry<Integer, ProcessInfo> procs : processTree.entrySet()) { |
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| 156 | ProcessInfo oldInfo = oldProcs.get(procs.getKey()); |
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| 157 | if (oldInfo != null) { |
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| 158 | if (procs.getValue() != null) { |
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| 159 | procs.getValue().updateAge(oldInfo); |
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| 160 | } |
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| 161 | } |
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| 162 | } |
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| 163 | |
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| 164 | if (LOG.isDebugEnabled()) { |
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| 165 | // Log.debug the ProcfsBasedProcessTree |
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| 166 | LOG.debug(this.toString()); |
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| 167 | } |
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| 168 | } |
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| 169 | return this; |
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| 170 | } |
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| 171 | |
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| 172 | /** |
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| 173 | * Is the process-tree alive? Currently we care only about the status of the |
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| 174 | * root-process. |
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| 175 | * |
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| 176 | * @return true if the process-true is alive, false otherwise. |
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| 177 | */ |
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| 178 | public boolean isAlive() { |
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| 179 | if (pid == -1) { |
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| 180 | return false; |
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| 181 | } else { |
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| 182 | return this.isAlive(pid); |
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| 183 | } |
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| 184 | } |
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| 185 | |
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| 186 | /** |
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| 187 | * Destroy the process-tree. Currently we only make sure the root process is |
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| 188 | * gone. It is the responsibility of the root process to make sure that all |
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| 189 | * its descendants are cleaned up. |
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| 190 | */ |
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| 191 | public void destroy() { |
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| 192 | LOG.debug("Killing ProcfsBasedProcessTree of " + pid); |
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| 193 | if (pid == -1) { |
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| 194 | return; |
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| 195 | } |
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| 196 | ShellCommandExecutor shexec = null; |
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| 197 | |
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| 198 | if (isAlive(this.pid)) { |
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| 199 | try { |
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| 200 | String[] args = { "kill", this.pid.toString() }; |
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| 201 | shexec = new ShellCommandExecutor(args); |
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| 202 | shexec.execute(); |
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| 203 | } catch (IOException ioe) { |
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| 204 | LOG.warn("Error executing shell command " + ioe); |
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| 205 | } finally { |
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| 206 | LOG.info("Killing " + pid + " with SIGTERM. Exit code " |
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| 207 | + shexec.getExitCode()); |
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| 208 | } |
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| 209 | } |
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| 210 | |
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| 211 | SigKillThread sigKillThread = new SigKillThread(); |
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| 212 | sigKillThread.setDaemon(true); |
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| 213 | sigKillThread.start(); |
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| 214 | } |
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| 215 | |
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| 216 | /** |
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| 217 | * Get the cumulative virtual memory used by all the processes in the |
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| 218 | * process-tree. |
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| 219 | * |
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| 220 | * @return cumulative virtual memory used by the process-tree in bytes. |
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| 221 | */ |
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| 222 | public long getCumulativeVmem() { |
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| 223 | // include all processes.. all processes will be older than 0. |
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| 224 | return getCumulativeVmem(0); |
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| 225 | } |
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| 226 | |
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| 227 | /** |
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| 228 | * Get the cumulative virtual memory used by all the processes in the |
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| 229 | * process-tree that are older than the passed in age. |
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| 230 | * |
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| 231 | * @param olderThanAge processes above this age are included in the |
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| 232 | * memory addition |
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| 233 | * @return cumulative virtual memory used by the process-tree in bytes, |
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| 234 | * for processes older than this age. |
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| 235 | */ |
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| 236 | public long getCumulativeVmem(int olderThanAge) { |
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| 237 | long total = 0; |
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| 238 | for (ProcessInfo p : processTree.values()) { |
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| 239 | if ((p != null) && (p.getAge() > olderThanAge)) { |
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| 240 | total += p.getVmem(); |
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| 241 | } |
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| 242 | } |
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| 243 | return total; |
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| 244 | } |
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| 245 | |
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| 246 | /** |
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| 247 | * Get PID from a pid-file. |
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| 248 | * |
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| 249 | * @param pidFileName |
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| 250 | * Name of the pid-file. |
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| 251 | * @return the PID string read from the pid-file. Returns null if the |
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| 252 | * pidFileName points to a non-existing file or if read fails from the |
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| 253 | * file. |
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| 254 | */ |
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| 255 | public static String getPidFromPidFile(String pidFileName) { |
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| 256 | BufferedReader pidFile = null; |
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| 257 | FileReader fReader = null; |
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| 258 | String pid = null; |
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| 259 | |
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| 260 | try { |
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| 261 | fReader = new FileReader(pidFileName); |
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| 262 | pidFile = new BufferedReader(fReader); |
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| 263 | } catch (FileNotFoundException f) { |
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| 264 | LOG.debug("PidFile doesn't exist : " + pidFileName); |
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| 265 | return pid; |
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| 266 | } |
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| 267 | |
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| 268 | try { |
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| 269 | pid = pidFile.readLine(); |
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| 270 | } catch (IOException i) { |
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| 271 | LOG.error("Failed to read from " + pidFileName); |
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| 272 | } finally { |
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| 273 | try { |
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| 274 | if (fReader != null) { |
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| 275 | fReader.close(); |
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| 276 | } |
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| 277 | try { |
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| 278 | if (pidFile != null) { |
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| 279 | pidFile.close(); |
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| 280 | } |
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| 281 | } catch (IOException i) { |
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| 282 | LOG.warn("Error closing the stream " + pidFile); |
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| 283 | } |
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| 284 | } catch (IOException i) { |
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| 285 | LOG.warn("Error closing the stream " + fReader); |
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| 286 | } |
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| 287 | } |
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| 288 | return pid; |
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| 289 | } |
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| 290 | |
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| 291 | private Integer getValidPID(String pid) { |
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| 292 | Integer retPid = -1; |
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| 293 | try { |
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| 294 | retPid = Integer.parseInt((String) pid); |
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| 295 | if (retPid <= 0) { |
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| 296 | retPid = -1; |
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| 297 | } |
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| 298 | } catch (NumberFormatException nfe) { |
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| 299 | retPid = -1; |
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| 300 | } |
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| 301 | return retPid; |
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| 302 | } |
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| 303 | |
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| 304 | /** |
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| 305 | * Get the list of all processes in the system. |
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| 306 | */ |
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| 307 | private List<Integer> getProcessList() { |
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| 308 | String[] processDirs = (new File(procfsDir)).list(); |
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| 309 | List<Integer> processList = new ArrayList<Integer>(); |
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| 310 | |
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| 311 | for (String dir : processDirs) { |
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| 312 | try { |
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| 313 | int pd = Integer.parseInt(dir); |
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| 314 | if ((new File(procfsDir, dir)).isDirectory()) { |
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| 315 | processList.add(Integer.valueOf(pd)); |
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| 316 | } |
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| 317 | } catch (NumberFormatException n) { |
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| 318 | // skip this directory |
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| 319 | } catch (SecurityException s) { |
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| 320 | // skip this process |
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| 321 | } |
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| 322 | } |
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| 323 | return processList; |
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| 324 | } |
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| 325 | |
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| 326 | /** |
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| 327 | * |
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| 328 | * Construct the ProcessInfo using the process' PID and procfs and return the |
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| 329 | * same. Returns null on failing to read from procfs, |
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| 330 | */ |
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| 331 | private ProcessInfo constructProcessInfo(ProcessInfo pinfo) { |
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| 332 | return constructProcessInfo(pinfo, PROCFS); |
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| 333 | } |
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| 334 | |
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| 335 | /** |
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| 336 | * Construct the ProcessInfo using the process' PID and procfs rooted at the |
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| 337 | * specified directory and return the same. It is provided mainly to assist |
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| 338 | * testing purposes. |
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| 339 | * |
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| 340 | * Returns null on failing to read from procfs, |
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| 341 | * |
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| 342 | * @param pinfo ProcessInfo that needs to be updated |
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| 343 | * @param procfsDir root of the proc file system |
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| 344 | * @return updated ProcessInfo, null on errors. |
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| 345 | */ |
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| 346 | private ProcessInfo constructProcessInfo(ProcessInfo pinfo, |
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| 347 | String procfsDir) { |
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| 348 | ProcessInfo ret = null; |
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| 349 | // Read "procfsDir/<pid>/stat" file |
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| 350 | BufferedReader in = null; |
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| 351 | FileReader fReader = null; |
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| 352 | try { |
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| 353 | File pidDir = new File(procfsDir, String.valueOf(pinfo.getPid())); |
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| 354 | fReader = new FileReader(new File(pidDir, "/stat")); |
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| 355 | in = new BufferedReader(fReader); |
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| 356 | } catch (FileNotFoundException f) { |
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| 357 | // The process vanished in the interim! |
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| 358 | return ret; |
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| 359 | } |
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| 360 | |
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| 361 | ret = pinfo; |
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| 362 | try { |
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| 363 | String str = in.readLine(); // only one line |
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| 364 | Matcher m = PROCFS_STAT_FILE_FORMAT.matcher(str); |
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| 365 | boolean mat = m.find(); |
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| 366 | if (mat) { |
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| 367 | // Set ( name ) ( ppid ) ( pgrpId ) (session ) (vsize ) |
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| 368 | pinfo.updateProcessInfo(m.group(2), Integer.parseInt(m.group(3)), Integer |
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| 369 | .parseInt(m.group(4)), Integer.parseInt(m.group(5)), Long |
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| 370 | .parseLong(m.group(7))); |
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| 371 | } |
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| 372 | } catch (IOException io) { |
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| 373 | LOG.warn("Error reading the stream " + io); |
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| 374 | ret = null; |
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| 375 | } finally { |
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| 376 | // Close the streams |
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| 377 | try { |
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| 378 | if (fReader != null) { |
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| 379 | fReader.close(); |
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| 380 | } |
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| 381 | try { |
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| 382 | if (in != null) { |
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| 383 | in.close(); |
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| 384 | } |
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| 385 | } catch (IOException i) { |
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| 386 | LOG.warn("Error closing the stream " + in); |
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| 387 | } |
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| 388 | } catch (IOException i) { |
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| 389 | LOG.warn("Error closing the stream " + fReader); |
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| 390 | } |
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| 391 | } |
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| 392 | |
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| 393 | return ret; |
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| 394 | } |
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| 395 | |
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| 396 | /** |
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| 397 | * Is the process with PID pid still alive? |
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| 398 | */ |
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| 399 | private boolean isAlive(Integer pid) { |
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| 400 | // This method assumes that isAlive is called on a pid that was alive not |
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| 401 | // too long ago, and hence assumes no chance of pid-wrapping-around. |
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| 402 | ShellCommandExecutor shexec = null; |
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| 403 | try { |
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| 404 | String[] args = { "kill", "-0", pid.toString() }; |
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| 405 | shexec = new ShellCommandExecutor(args); |
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| 406 | shexec.execute(); |
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| 407 | } catch (ExitCodeException ee) { |
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| 408 | return false; |
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| 409 | } catch (IOException ioe) { |
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| 410 | LOG.warn("Error executing shell command " |
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| 411 | + Arrays.toString(shexec.getExecString()) + ioe); |
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| 412 | return false; |
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| 413 | } |
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| 414 | return (shexec.getExitCode() == 0 ? true : false); |
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| 415 | } |
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| 416 | |
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| 417 | /** |
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| 418 | * Helper thread class that kills process-tree with SIGKILL in background |
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| 419 | */ |
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| 420 | private class SigKillThread extends Thread { |
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| 421 | |
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| 422 | public void run() { |
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| 423 | this.setName(this.getClass().getName() + "-" + String.valueOf(pid)); |
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| 424 | ShellCommandExecutor shexec = null; |
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| 425 | |
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| 426 | try { |
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| 427 | // Sleep for some time before sending SIGKILL |
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| 428 | Thread.sleep(sleepTimeBeforeSigKill); |
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| 429 | } catch (InterruptedException i) { |
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| 430 | LOG.warn("Thread sleep is interrupted."); |
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| 431 | } |
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| 432 | |
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| 433 | // Kill the root process with SIGKILL if it is still alive |
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| 434 | if (ProcfsBasedProcessTree.this.isAlive(pid)) { |
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| 435 | try { |
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| 436 | String[] args = { "kill", "-9", pid.toString() }; |
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| 437 | shexec = new ShellCommandExecutor(args); |
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| 438 | shexec.execute(); |
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| 439 | } catch (IOException ioe) { |
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| 440 | LOG.warn("Error executing shell command " + ioe); |
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| 441 | } finally { |
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| 442 | LOG.info("Killing " + pid + " with SIGKILL. Exit code " |
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| 443 | + shexec.getExitCode()); |
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| 444 | } |
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| 445 | } |
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| 446 | } |
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| 447 | } |
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| 448 | /** |
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| 449 | * Returns a string printing PIDs of process present in the |
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| 450 | * ProcfsBasedProcessTree. Output format : [pid pid ..] |
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| 451 | */ |
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| 452 | public String toString() { |
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| 453 | StringBuffer pTree = new StringBuffer("[ "); |
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| 454 | for (Integer p : processTree.keySet()) { |
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| 455 | pTree.append(p); |
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| 456 | pTree.append(" "); |
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| 457 | } |
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| 458 | return pTree.substring(0, pTree.length()) + "]"; |
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| 459 | } |
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| 460 | |
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| 461 | /** |
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| 462 | * |
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| 463 | * Class containing information of a process. |
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| 464 | * |
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| 465 | */ |
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| 466 | private static class ProcessInfo { |
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| 467 | private Integer pid; // process-id |
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| 468 | private String name; // command name |
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| 469 | private Integer pgrpId; // process group-id |
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| 470 | private Integer ppid; // parent process-id |
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| 471 | private Integer sessionId; // session-id |
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| 472 | private Long vmem; // virtual memory usage |
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| 473 | // how many times has this process been seen alive |
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| 474 | private int age; |
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| 475 | private List<ProcessInfo> children = new ArrayList<ProcessInfo>(); // list of children |
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| 476 | |
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| 477 | public ProcessInfo(int pid) { |
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| 478 | this.pid = Integer.valueOf(pid); |
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| 479 | // seeing this the first time. |
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| 480 | this.age = 1; |
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| 481 | } |
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| 482 | |
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| 483 | public Integer getPid() { |
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| 484 | return pid; |
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| 485 | } |
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| 486 | |
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| 487 | public String getName() { |
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| 488 | return name; |
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| 489 | } |
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| 490 | |
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| 491 | public Integer getPgrpId() { |
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| 492 | return pgrpId; |
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| 493 | } |
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| 494 | |
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| 495 | public Integer getPpid() { |
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| 496 | return ppid; |
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| 497 | } |
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| 498 | |
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| 499 | public Integer getSessionId() { |
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| 500 | return sessionId; |
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| 501 | } |
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| 502 | |
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| 503 | public Long getVmem() { |
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| 504 | return vmem; |
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| 505 | } |
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| 506 | |
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| 507 | public int getAge() { |
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| 508 | return age; |
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| 509 | } |
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| 510 | |
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| 511 | public boolean isParent(ProcessInfo p) { |
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| 512 | if (pid.equals(p.getPpid())) { |
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| 513 | return true; |
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| 514 | } |
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| 515 | return false; |
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| 516 | } |
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| 517 | |
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| 518 | public void updateProcessInfo(String name, Integer ppid, Integer pgrpId, |
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| 519 | Integer sessionId, Long vmem) { |
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| 520 | this.name = name; |
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| 521 | this.ppid = ppid; |
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| 522 | this.pgrpId = pgrpId; |
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| 523 | this.sessionId = sessionId; |
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| 524 | this.vmem = vmem; |
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| 525 | } |
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| 526 | |
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| 527 | public void updateAge(ProcessInfo oldInfo) { |
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| 528 | this.age = oldInfo.age + 1; |
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| 529 | } |
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| 530 | |
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| 531 | public boolean addChild(ProcessInfo p) { |
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| 532 | return children.add(p); |
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| 533 | } |
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| 534 | |
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| 535 | public List<ProcessInfo> getChildren() { |
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| 536 | return children; |
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| 537 | } |
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| 538 | } |
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| 539 | } |
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