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From jia...@apache.org
Subject [27/39] hadoop git commit: YARN-5461. Initial code ported from slider-core module. (jianhe)
Date Tue, 02 Aug 2016 16:27:08 GMT
http://git-wip-us.apache.org/repos/asf/hadoop/blob/848f9490/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/common/tools/SliderUtils.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/common/tools/SliderUtils.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/common/tools/SliderUtils.java
new file mode 100644
index 0000000..73e0879
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/common/tools/SliderUtils.java
@@ -0,0 +1,2548 @@
+/*
+ * 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.slider.common.tools;
+
+import com.google.common.base.Preconditions;
+
+import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
+import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
+import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
+import org.apache.commons.compress.archivers.zip.ZipArchiveInputStream;
+import org.apache.commons.io.output.ByteArrayOutputStream;
+import org.apache.commons.lang.StringUtils;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.FileUtil;
+import org.apache.hadoop.fs.GlobFilter;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.io.IOUtils;
+import org.apache.hadoop.io.nativeio.NativeIO;
+import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.security.SecurityUtil;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.util.ExitUtil;
+import org.apache.hadoop.util.Shell;
+import org.apache.hadoop.util.VersionInfo;
+import org.apache.hadoop.yarn.api.ApplicationConstants;
+import org.apache.hadoop.yarn.api.records.ApplicationReport;
+import org.apache.hadoop.yarn.api.records.Container;
+import org.apache.hadoop.yarn.api.records.LocalResource;
+import org.apache.hadoop.yarn.api.records.NodeReport;
+import org.apache.hadoop.yarn.api.records.YarnApplicationState;
+import org.apache.hadoop.yarn.client.api.AMRMClient;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.slider.Slider;
+import org.apache.slider.api.InternalKeys;
+import org.apache.slider.api.RoleKeys;
+import org.apache.slider.api.types.ContainerInformation;
+import org.apache.slider.common.SliderKeys;
+import org.apache.slider.common.SliderXmlConfKeys;
+import org.apache.slider.common.params.Arguments;
+import org.apache.slider.common.params.SliderActions;
+import org.apache.slider.core.conf.ConfTreeOperations;
+import org.apache.slider.core.conf.MapOperations;
+import org.apache.slider.core.exceptions.BadClusterStateException;
+import org.apache.slider.core.exceptions.BadCommandArgumentsException;
+import org.apache.slider.core.exceptions.BadConfigException;
+import org.apache.slider.core.exceptions.ErrorStrings;
+import org.apache.slider.core.exceptions.SliderException;
+import org.apache.slider.core.launch.ClasspathConstructor;
+import org.apache.slider.core.main.LauncherExitCodes;
+import org.apache.slider.providers.agent.AgentKeys;
+import org.apache.slider.server.services.utility.PatternValidator;
+import org.apache.slider.server.services.workflow.ForkedProcessService;
+import org.apache.zookeeper.server.util.KerberosUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.BufferedOutputStream;
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.FilenameFilter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.PrintWriter;
+import java.io.Serializable;
+import java.io.StringWriter;
+import java.net.InetSocketAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.net.URLDecoder;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Date;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+import java.util.TimeZone;
+import java.util.Timer;
+import java.util.TimerTask;
+import java.util.TreeMap;
+import java.util.TreeSet;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.regex.Pattern;
+import java.util.zip.GZIPOutputStream;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+/**
+ * These are slider-specific Util methods
+ */
+public final class SliderUtils {
+
+  private static final Logger log = LoggerFactory.getLogger(SliderUtils.class);
+
+  /**
+   * Atomic bool to track whether or not process security has already been
+   * turned on (prevents re-entrancy)
+   */
+  private static final AtomicBoolean processSecurityAlreadyInitialized =
+      new AtomicBoolean(false);
+  public static final String JAVA_SECURITY_KRB5_REALM =
+      "java.security.krb5.realm";
+  public static final String JAVA_SECURITY_KRB5_KDC = "java.security.krb5.kdc";
+
+  /**
+   * Winutils
+   */
+  public static final String WINUTILS = "WINUTILS.EXE";
+  /**
+   * name of openssl program
+   */
+  public static final String OPENSSL = "openssl";
+
+  /**
+   * name of python program
+   */
+  public static final String PYTHON = "python";
+
+  /**
+   * type of docker standalone application
+   */
+  public static final String DOCKER = "docker";
+  /**
+   * type of docker on yarn application
+   */
+  public static final String DOCKER_YARN = "yarn_docker";
+
+  public static final int NODE_LIST_LIMIT = 10;
+
+  private SliderUtils() {
+  }
+
+  /**
+   * Implementation of set-ness, groovy definition of true/false for a string
+   * @param s string
+   * @return true iff the string is neither null nor empty
+   */
+  public static boolean isUnset(String s) {
+    return s == null || s.isEmpty();
+  }
+
+  public static boolean isSet(String s) {
+    return !isUnset(s);
+  }
+
+  /**
+   * Probe for a list existing and not being empty
+   * @param l list
+   * @return true if the reference is valid and it contains entries
+   */
+
+  public static boolean isNotEmpty(List l) {
+    return l != null && !l.isEmpty();
+  }
+
+  /**
+   * Probe for a map existing and not being empty
+   * @param m map
+   * @return true if the reference is valid and it contains map entries
+   */
+  public static boolean isNotEmpty(Map m) {
+    return m != null && !m.isEmpty();
+  }
+  
+  /*
+   * Validates whether num is an integer
+   * @param num
+   * @param msg the message to be shown in exception
+   */
+  @SuppressWarnings("ResultOfMethodCallIgnored")
+  private static void validateNumber(String num, String msg) throws
+      BadConfigException {
+    try {
+      Integer.parseInt(num);
+    } catch (NumberFormatException nfe) {
+      throw new BadConfigException(msg + num);
+    }
+  }
+
+  /*
+   * Translates the trailing JVM heapsize unit: g, G, m, M
+   * This assumes designated unit of 'm'
+   * @param heapsize
+   * @return heapsize in MB
+   */
+  public static String translateTrailingHeapUnit(String heapsize) throws
+      BadConfigException {
+    String errMsg = "Bad heapsize: ";
+    if (heapsize.endsWith("m") || heapsize.endsWith("M")) {
+      String num = heapsize.substring(0, heapsize.length() - 1);
+      validateNumber(num, errMsg);
+      return num;
+    }
+    if (heapsize.endsWith("g") || heapsize.endsWith("G")) {
+      String num = heapsize.substring(0, heapsize.length() - 1) + "000";
+      validateNumber(num, errMsg);
+      return num;
+    }
+    // check if specified heap size is a number
+    validateNumber(heapsize, errMsg);
+    return heapsize;
+  }
+
+  /**
+   * recursive directory delete
+   * @param dir dir to delete
+   * @throws IOException on any problem
+   */
+  public static void deleteDirectoryTree(File dir) throws IOException {
+    if (dir.exists()) {
+      if (dir.isDirectory()) {
+        log.info("Cleaning up {}", dir);
+        //delete the children
+        File[] files = dir.listFiles();
+        if (files == null) {
+          throw new IOException("listfiles() failed for " + dir);
+        }
+        for (File file : files) {
+          log.info("deleting {}", file);
+          if (!file.delete()) {
+            log.warn("Unable to delete " + file);
+          }
+        }
+        if (!dir.delete()) {
+          log.warn("Unable to delete " + dir);
+        }
+      } else {
+        throw new IOException("Not a directory " + dir);
+      }
+    } else {
+      //not found, do nothing
+      log.debug("No output dir yet");
+    }
+  }
+
+  /**
+   * Find a containing JAR
+   * @param clazz class to find
+   * @return the file
+   * @throws IOException any IO problem, including the class not having a
+   * classloader
+   * @throws FileNotFoundException if the class did not resolve to a file
+   */
+  public static File findContainingJarOrFail(Class clazz) throws IOException {
+    File localFile = SliderUtils.findContainingJar(clazz);
+    if (null == localFile) {
+      throw new FileNotFoundException("Could not find JAR containing " + clazz);
+    }
+    return localFile;
+  }
+
+
+  /**
+   * Find a containing JAR
+   * @param my_class class to find
+   * @return the file or null if it is not found
+   * @throws IOException any IO problem, including the class not having a
+   * classloader
+   */
+  public static File findContainingJar(Class my_class) throws IOException {
+    ClassLoader loader = my_class.getClassLoader();
+    if (loader == null) {
+      throw new IOException(
+          "Class " + my_class + " does not have a classloader!");
+    }
+    String class_file = my_class.getName().replaceAll("\\.", "/") + ".class";
+    Enumeration<URL> urlEnumeration = loader.getResources(class_file);
+    if (urlEnumeration == null) {
+      throw new IOException("Unable to find resources for class " + my_class);
+    }
+
+    for (; urlEnumeration.hasMoreElements(); ) {
+      URL url = urlEnumeration.nextElement();
+      if ("jar".equals(url.getProtocol())) {
+        String toReturn = url.getPath();
+        if (toReturn.startsWith("file:")) {
+          toReturn = toReturn.substring("file:".length());
+        }
+        // URLDecoder is a misnamed class, since it actually decodes
+        // x-www-form-urlencoded MIME type rather than actual
+        // URL encoding (which the file path has). Therefore it would
+        // decode +s to ' 's which is incorrect (spaces are actually
+        // either unencoded or encoded as "%20"). Replace +s first, so
+        // that they are kept sacred during the decoding process.
+        toReturn = toReturn.replaceAll("\\+", "%2B");
+        toReturn = URLDecoder.decode(toReturn, "UTF-8");
+        String jarFilePath = toReturn.replaceAll("!.*$", "");
+        return new File(jarFilePath);
+      } else {
+        log.info("could not locate JAR containing {} URL={}", my_class, url);
+      }
+    }
+    return null;
+  }
+
+  public static void checkPort(String hostname, int port, int connectTimeout)
+      throws IOException {
+    InetSocketAddress addr = new InetSocketAddress(hostname, port);
+    checkPort(hostname, addr, connectTimeout);
+  }
+
+  @SuppressWarnings("SocketOpenedButNotSafelyClosed")
+  public static void checkPort(String name,
+      InetSocketAddress address,
+      int connectTimeout)
+      throws IOException {
+    try(Socket socket = new Socket()) {
+      socket.connect(address, connectTimeout);
+    } catch (Exception e) {
+      throw new IOException("Failed to connect to " + name
+                            + " at " + address
+                            + " after " + connectTimeout + "milliseconds"
+                            + ": " + e,
+          e);
+    }
+  }
+
+  public static void checkURL(String name, String url, int timeout) throws
+      IOException {
+    InetSocketAddress address = NetUtils.createSocketAddr(url);
+    checkPort(name, address, timeout);
+  }
+
+  /**
+   * A required file
+   * @param role role of the file (for errors)
+   * @param filename the filename
+   * @throws ExitUtil.ExitException if the file is missing
+   * @return the file
+   */
+  public static File requiredFile(String filename, String role) throws
+      IOException {
+    if (filename.isEmpty()) {
+      throw new ExitUtil.ExitException(-1, role + " file not defined");
+    }
+    File file = new File(filename);
+    if (!file.exists()) {
+      throw new ExitUtil.ExitException(-1,
+          role + " file not found: " +
+          file.getCanonicalPath());
+    }
+    return file;
+  }
+
+  private static final PatternValidator clusternamePattern
+      = new PatternValidator("[a-z][a-z0-9_-]*");
+
+  /**
+   * Normalize a cluster name then verify that it is valid
+   * @param name proposed cluster name
+   * @return true iff it is valid
+   */
+  public static boolean isClusternameValid(String name) {
+    return name != null && clusternamePattern.matches(name);
+  }
+
+  public static boolean oldIsClusternameValid(String name) {
+    if (name == null || name.isEmpty()) {
+      return false;
+    }
+    int first = name.charAt(0);
+    if (0 == (Character.getType(first) & Character.LOWERCASE_LETTER)) {
+      return false;
+    }
+
+    for (int i = 0; i < name.length(); i++) {
+      int elt = (int) name.charAt(i);
+      int t = Character.getType(elt);
+      if (0 == (t & Character.LOWERCASE_LETTER)
+          && 0 == (t & Character.DECIMAL_DIGIT_NUMBER)
+          && elt != '-'
+          && elt != '_') {
+        return false;
+      }
+      if (!Character.isLetterOrDigit(elt) && elt != '-' && elt != '_') {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  /**
+   * Copy a directory to a new FS -both paths must be qualified. If
+   * a directory needs to be created, supplied permissions can override
+   * the default values. Existing directories are not touched
+   * @param conf conf file
+   * @param srcDirPath src dir
+   * @param destDirPath dest dir
+   * @param permission permission for the dest directory; null means "default"
+   * @return # of files copies
+   */
+  public static int copyDirectory(Configuration conf,
+      Path srcDirPath,
+      Path destDirPath,
+      FsPermission permission) throws
+      IOException,
+      BadClusterStateException {
+    FileSystem srcFS = FileSystem.get(srcDirPath.toUri(), conf);
+    FileSystem destFS = FileSystem.get(destDirPath.toUri(), conf);
+    //list all paths in the src.
+    if (!srcFS.exists(srcDirPath)) {
+      throw new FileNotFoundException("Source dir not found " + srcDirPath);
+    }
+    if (!srcFS.isDirectory(srcDirPath)) {
+      throw new FileNotFoundException(
+          "Source dir not a directory " + srcDirPath);
+    }
+    GlobFilter dotFilter = new GlobFilter("[!.]*");
+    FileStatus[] entries = srcFS.listStatus(srcDirPath, dotFilter);
+    int srcFileCount = entries.length;
+    if (srcFileCount == 0) {
+      return 0;
+    }
+    if (permission == null) {
+      permission = FsPermission.getDirDefault();
+    }
+    if (!destFS.exists(destDirPath)) {
+      new SliderFileSystem(destFS, conf).createWithPermissions(destDirPath,
+          permission);
+    }
+    Path[] sourcePaths = new Path[srcFileCount];
+    for (int i = 0; i < srcFileCount; i++) {
+      FileStatus e = entries[i];
+      Path srcFile = e.getPath();
+      if (srcFS.isDirectory(srcFile)) {
+        String msg = "Configuration dir " + srcDirPath
+                     + " contains a directory " + srcFile;
+        log.warn(msg);
+        throw new IOException(msg);
+      }
+      log.debug("copying src conf file {}", srcFile);
+      sourcePaths[i] = srcFile;
+    }
+    log.debug("Copying {} files from {} to dest {}", srcFileCount,
+        srcDirPath,
+        destDirPath);
+    FileUtil.copy(srcFS, sourcePaths, destFS, destDirPath, false, true, conf);
+    return srcFileCount;
+  }
+
+
+  public static String stringify(Throwable t) {
+    StringWriter sw = new StringWriter();
+    sw.append(t.toString()).append('\n');
+    t.printStackTrace(new PrintWriter(sw));
+    return sw.toString();
+  }
+
+  /**
+   * Create a configuration with Slider-specific tuning.
+   * This is done rather than doing custom configs.
+   * @return the config
+   */
+  public static YarnConfiguration createConfiguration() {
+    YarnConfiguration conf = new YarnConfiguration();
+    patchConfiguration(conf);
+    return conf;
+  }
+
+  /**
+   * Take an existing conf and patch it for Slider's needs. Useful
+   * in Service.init & RunService methods where a shared config is being
+   * passed in
+   * @param conf configuration
+   * @return the patched configuration
+   */
+  public static Configuration patchConfiguration(Configuration conf) {
+
+    //if the fallback option is NOT set, enable it.
+    //if it is explicitly set to anything -leave alone
+    if (conf.get(SliderXmlConfKeys.IPC_CLIENT_FALLBACK_TO_SIMPLE_AUTH) == null) {
+      conf.set(SliderXmlConfKeys.IPC_CLIENT_FALLBACK_TO_SIMPLE_AUTH, "true");
+    }
+    return conf;
+  }
+
+  /**
+   * Take a collection, return a list containing the string value of every
+   * element in the collection.
+   * @param c collection
+   * @return a stringified list
+   */
+  public static List<String> collectionToStringList(Collection c) {
+    List<String> l = new ArrayList<>(c.size());
+    for (Object o : c) {
+      l.add(o.toString());
+    }
+    return l;
+  }
+
+  /**
+   * Join an collection of objects with a separator that appears after every
+   * instance in the list -including at the end
+   * @param collection collection to call toString() on each element
+   * @param separator separator string
+   * @return the joined entries
+   */
+  public static String join(Collection collection, String separator) {
+    return join(collection, separator, true);
+  }
+
+  /**
+   * Join an collection of objects with a separator that appears after every
+   * instance in the list -optionally at the end
+   * @param collection collection to call toString() on each element
+   * @param separator separator string
+   * @param trailing add a trailing entry or not
+   * @return the joined entries
+   */
+  public static String join(Collection collection,
+      String separator,
+      boolean trailing) {
+    StringBuilder b = new StringBuilder();
+    // fast return on empty collection
+    if (collection.isEmpty()) {
+      return trailing ? separator : "";
+    }
+    for (Object o : collection) {
+      b.append(o);
+      b.append(separator);
+    }
+    int length = separator.length();
+    String s = b.toString();
+    return (trailing || s.isEmpty()) ?
+           s : (b.substring(0, b.length() - length));
+  }
+
+  /**
+   * Join an array of strings with a separator that appears after every
+   * instance in the list -including at the end
+   * @param collection strings
+   * @param separator separator string
+   * @return the joined entries
+   */
+  public static String join(String[] collection, String separator) {
+    return join(collection, separator, true);
+
+
+  }
+
+  /**
+   * Join an array of strings with a separator that appears after every
+   * instance in the list -optionally at the end
+   * @param collection strings
+   * @param separator separator string
+   * @param trailing add a trailing entry or not
+   * @return the joined entries
+   */
+  public static String join(String[] collection, String separator,
+      boolean trailing) {
+    return join(Arrays.asList(collection), separator, trailing);
+  }
+
+  /**
+   * Join an array of strings with a separator that appears after every
+   * instance in the list -except at the end
+   * @param collection strings
+   * @param separator separator string
+   * @return the list
+   */
+  public static String joinWithInnerSeparator(String separator,
+      Object... collection) {
+    StringBuilder b = new StringBuilder();
+    boolean first = true;
+
+    for (Object o : collection) {
+      if (first) {
+        first = false;
+      } else {
+        b.append(separator);
+      }
+      b.append(o.toString());
+      b.append(separator);
+    }
+    return b.toString();
+  }
+
+  /**
+   * Resolve a mandatory environment variable
+   * @param key env var
+   * @return the resolved value
+   * @throws BadClusterStateException
+   */
+  public static String mandatoryEnvVariable(String key) throws
+      BadClusterStateException {
+    String v = System.getenv(key);
+    if (v == null) {
+      throw new BadClusterStateException("Missing Environment variable " + key);
+    }
+    return v;
+  }
+
+  public static String appReportToString(ApplicationReport r,
+      String separator) {
+    StringBuilder builder = new StringBuilder(512);
+    builder.append("application ")
+           .append(
+               r.getName())
+           .append("/")
+           .append(r.getApplicationType())
+           .append(separator);
+    Set<String> tags = r.getApplicationTags();
+    if (!tags.isEmpty()) {
+      for (String tag : tags) {
+        builder.append(tag).append(separator);
+      }
+    }
+    DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm");
+    dateFormat.setTimeZone(TimeZone.getDefault());
+    builder.append("state: ").append(r.getYarnApplicationState());
+    String trackingUrl = r.getTrackingUrl();
+    if (isSet(trackingUrl)) {
+      builder.append(separator).append("URL: ").append(trackingUrl);
+    }
+    builder.append(separator)
+           .append("Started: ")
+           .append(dateFormat.format(new Date(r.getStartTime())));
+    long finishTime = r.getFinishTime();
+    if (finishTime > 0) {
+      builder.append(separator)
+             .append("Finished: ")
+             .append(dateFormat.format(new Date(finishTime)));
+    }
+    String rpcHost = r.getHost();
+    if (!isSet(rpcHost)) {
+      builder.append(separator)
+             .append("RPC :")
+             .append(rpcHost)
+             .append(':')
+             .append(r.getRpcPort());
+    }
+    String diagnostics = r.getDiagnostics();
+    if (!isSet(diagnostics)) {
+      builder.append(separator).append("Diagnostics :").append(diagnostics);
+    }
+    return builder.toString();
+  }
+
+  /**
+   * Convert the instance details of an application to a string
+   * @param name instance name
+   * @param report the application report
+   * @param verbose verbose output
+   * @return a string
+   */
+  public static String instanceDetailsToString(String name,
+      ApplicationReport report,
+      List<ContainerInformation> containers,
+      String version,
+      Set<String> components,
+      boolean verbose) {
+    // format strings
+    String staticf = "%-30s";
+    String reportedf = staticf + "  %10s  %-42s";
+    String livef = reportedf + "  %s";
+    StringBuilder builder = new StringBuilder(200);
+    if (report == null) {
+      builder.append(String.format(staticf, name));
+    } else {
+      // there's a report to look at
+      String appId = report.getApplicationId().toString();
+      String state = report.getYarnApplicationState().toString();
+      if (report.getYarnApplicationState() == YarnApplicationState.RUNNING) {
+        // running: there's a URL
+        builder.append(
+            String.format(livef, name, state, appId, report.getTrackingUrl()));
+      } else {
+        builder.append(String.format(reportedf, name, state, appId));
+      }
+      if (verbose) {
+        builder.append('\n');
+        builder.append(SliderUtils.appReportToString(report, "\n  "));
+      }
+      if (containers != null) {
+        builder.append('\n');
+        builder.append(SliderUtils.containersToString(containers, version,
+            components));
+      }
+    }
+
+    builder.append('\n');
+    return builder.toString();
+  }
+
+  public static String containersToString(
+      List<ContainerInformation> containers, String version,
+      Set<String> components) {
+    String containerf = "  %-28s  %30s  %45s  %s\n";
+    StringBuilder builder = new StringBuilder(512);
+    builder.append("Containers:\n");
+    builder.append(String.format("  %-28s  %30s  %45s  %s\n", "Component Name",
+        "App Version", "Container Id", "Container Info/Logs"));
+    for (ContainerInformation container : containers) {
+      if (filter(container.appVersion, version)
+          || filter(container.component, components)) {
+        continue;
+      }
+      builder.append(String.format(containerf, container.component,
+          container.appVersion, container.containerId, container.host
+              + SliderKeys.YARN_CONTAINER_PATH + container.containerId));
+    }
+    return builder.toString();
+  }
+
+  /**
+   * Filter a string value given a single filter
+   * 
+   * @param value
+   *          the string value to check
+   * @param filter
+   *          a single string filter
+   * @return return true if value should be trapped, false if it should be let
+   *         through
+   */
+  public static boolean filter(String value, String filter) {
+    return !(StringUtils.isEmpty(filter) || filter.equals(value));
+  }
+
+  /**
+   * Filter a string value given a set of filters
+   * 
+   * @param value
+   *          the string value to check
+   * @param filters
+   *          a set of string filters
+   * @return return true if value should be trapped, false if it should be let
+   *         through
+   */
+  public static boolean filter(String value, Set<String> filters) {
+    return !(filters.isEmpty() || filters.contains(value));
+  }
+
+  /**
+   * Sorts the given list of application reports, most recently started 
+   * or finished instance first.
+   *
+   * @param instances list of instances
+   */
+  public static void sortApplicationsByMostRecent(List<ApplicationReport> instances) {
+    Collections.sort(instances, new MostRecentlyStartedOrFinishedFirst());
+  }
+
+  /**
+   * Sorts the given list of application reports
+   * Finished instances are ordered by finished time and running/accepted instances are
+   * ordered by start time
+   * Finally Instance are order by finished instances coming after running instances
+   *
+   * @param instances list of instances
+   */
+  public static void sortApplicationReport(List<ApplicationReport> instances) {
+    if (instances.size() <= 1) {
+      return;
+    }
+    List<ApplicationReport> nonLiveInstance =
+        new ArrayList<>(instances.size());
+    List<ApplicationReport> liveInstance =
+        new ArrayList<>(instances.size());
+
+    for (ApplicationReport report : instances) {
+      if (report.getYarnApplicationState() == YarnApplicationState.RUNNING
+          ||
+          report.getYarnApplicationState() == YarnApplicationState.ACCEPTED) {
+        liveInstance.add(report);
+      } else {
+        nonLiveInstance.add(report);
+      }
+    }
+
+    if (liveInstance.size() > 1) {
+      Collections.sort(liveInstance, new MostRecentlyStartedAppFirst());
+    }
+    if (nonLiveInstance.size() > 1) {
+      Collections.sort(nonLiveInstance, new MostRecentAppFinishFirst());
+    }
+    instances.clear();
+    instances.addAll(liveInstance);
+    instances.addAll(nonLiveInstance);
+  }
+
+  /**
+   * Built a (sorted) map of application reports, mapped to the instance name
+   * The list is sorted, and the addition process does not add a report
+   * if there is already one that exists. If the list handed in is sorted,
+   * those that are listed first form the entries returned
+   * @param instances list of intances
+   * @param minState minimum YARN state to be included
+   * @param maxState maximum YARN state to be included
+   * @return all reports in the list whose state &gt;= minimum and &lt;= maximum
+   */
+  public static Map<String, ApplicationReport> buildApplicationReportMap(
+      List<ApplicationReport> instances,
+      YarnApplicationState minState, YarnApplicationState maxState) {
+    TreeMap<String, ApplicationReport> map = new TreeMap<>();
+    for (ApplicationReport report : instances) {
+      YarnApplicationState state = report.getYarnApplicationState();
+      if (state.ordinal() >= minState.ordinal() &&
+          state.ordinal() <= maxState.ordinal() &&
+          map.get(report.getName()) == null) {
+        map.put(report.getName(), report);
+      }
+    }
+    return map;
+  }
+
+  /**
+   * Take a map and produce a sorted equivalent
+   * @param source source map
+   * @return a map whose iterator returns the string-sorted ordering of entries
+   */
+  public static Map<String, String> sortedMap(Map<String, String> source) {
+    Map<String, String> out = new TreeMap<>(source);
+    return out;
+  }
+
+  /**
+   * Convert a properties instance to a string map.
+   * @param properties source property object
+   * @return a string map
+   */
+  public static Map<String, String> toMap(Properties properties) {
+    Map<String, String> out = new HashMap<>(properties.size());
+    for (Map.Entry<Object, Object> entry : properties.entrySet()) {
+      out.put(entry.getKey().toString(), entry.getValue().toString());
+    }
+    return out;
+  }
+
+  /**
+   * Merge in one map to another -all entries in the second map are
+   * merged into the first -overwriting any duplicate keys.
+   * @param first first map -the updated one.
+   * @param second the map that is merged in
+   * @return the first map
+   */
+  public static Map<String, String> mergeMap(Map<String, String> first,
+      Map<String, String> second) {
+    first.putAll(second);
+    return first;
+  }
+
+  /**
+   * Merge a set of entries into a map. This will take the entryset of
+   * a map, or a Hadoop collection itself
+   * @param dest destination
+   * @param entries entries
+   * @return dest -with the entries merged in
+   */
+  public static Map<String, String> mergeEntries(Map<String, String> dest,
+      Iterable<Map.Entry<String, String>> entries) {
+    for (Map.Entry<String, String> entry : entries) {
+      dest.put(entry.getKey(), entry.getValue());
+    }
+    return dest;
+  }
+
+  /**
+   * Generic map merge logic
+   * @param first first map
+   * @param second second map
+   * @param <T1> key type
+   * @param <T2> value type
+   * @return 'first' merged with the second
+   */
+  public static <T1, T2> Map<T1, T2> mergeMaps(Map<T1, T2> first,
+      Map<T1, T2> second) {
+    first.putAll(second);
+    return first;
+  }
+
+  /**
+   * Generic map merge logic
+   * @param first first map
+   * @param second second map
+   * @param <T1> key type
+   * @param <T2> value type
+   * @return 'first' merged with the second
+   */
+  public static <T1, T2> Map<T1, T2> mergeMapsIgnoreDuplicateKeys(Map<T1, T2> first,
+      Map<T1, T2> second) {
+    Preconditions.checkArgument(first != null, "Null 'first' value");
+    Preconditions.checkArgument(second != null, "Null 'second' value");
+    for (Map.Entry<T1, T2> entry : second.entrySet()) {
+      T1 key = entry.getKey();
+      if (!first.containsKey(key)) {
+        first.put(key, entry.getValue());
+      }
+    }
+    return first;
+  }
+
+  /**
+   * Convert a map to a multi-line string for printing
+   * @param map map to stringify
+   * @return a string representation of the map
+   */
+  public static String stringifyMap(Map<String, String> map) {
+    StringBuilder builder = new StringBuilder();
+    for (Map.Entry<String, String> entry : map.entrySet()) {
+      builder.append(entry.getKey())
+             .append("=\"")
+             .append(entry.getValue())
+             .append("\"\n");
+
+    }
+    return builder.toString();
+  }
+
+  /**
+   * Get the int value of a role
+   * @param roleMap map of role key->val entries
+   * @param key key the key to look for
+   * @param defVal default value to use if the key is not in the map
+   * @param min min value or -1 for do not check
+   * @param max max value or -1 for do not check
+   * @return the int value the integer value
+   * @throws BadConfigException if the value could not be parsed
+   */
+  public static int getIntValue(Map<String, String> roleMap,
+      String key,
+      int defVal,
+      int min,
+      int max
+  ) throws BadConfigException {
+    String valS = roleMap.get(key);
+    return parseAndValidate(key, valS, defVal, min, max);
+
+  }
+
+  /**
+   * Parse an int value, replacing it with defval if undefined;
+   * @param errorKey key to use in exceptions
+   * @param defVal default value to use if the key is not in the map
+   * @param min min value or -1 for do not check
+   * @param max max value or -1 for do not check
+   * @return the int value the integer value
+   * @throws BadConfigException if the value could not be parsed
+   */
+  public static int parseAndValidate(String errorKey,
+      String valS,
+      int defVal,
+      int min, int max) throws
+      BadConfigException {
+    if (valS == null) {
+      valS = Integer.toString(defVal);
+    }
+    String trim = valS.trim();
+    int val;
+    try {
+      val = Integer.decode(trim);
+    } catch (NumberFormatException e) {
+      throw new BadConfigException("Failed to parse value of "
+                                   + errorKey + ": \"" + trim + "\"");
+    }
+    if (min >= 0 && val < min) {
+      throw new BadConfigException("Value of "
+                                   + errorKey + ": " + val + ""
+                                   + "is less than the minimum of " + min);
+    }
+    if (max >= 0 && val > max) {
+      throw new BadConfigException("Value of "
+                                   + errorKey + ": " + val + ""
+                                   + "is more than the maximum of " + max);
+    }
+    return val;
+  }
+
+  public static InetSocketAddress getRmAddress(Configuration conf) {
+    return conf.getSocketAddr(YarnConfiguration.RM_ADDRESS,
+        YarnConfiguration.DEFAULT_RM_ADDRESS,
+        YarnConfiguration.DEFAULT_RM_PORT);
+  }
+
+  public static InetSocketAddress getRmSchedulerAddress(Configuration conf) {
+    return conf.getSocketAddr(YarnConfiguration.RM_SCHEDULER_ADDRESS,
+        YarnConfiguration.DEFAULT_RM_SCHEDULER_ADDRESS,
+        YarnConfiguration.DEFAULT_RM_SCHEDULER_PORT);
+  }
+
+  /**
+   * probe to see if the RM scheduler is defined
+   * @param conf config
+   * @return true if the RM scheduler address is set to
+   * something other than 0.0.0.0
+   */
+  public static boolean isRmSchedulerAddressDefined(Configuration conf) {
+    InetSocketAddress address = getRmSchedulerAddress(conf);
+    return isAddressDefined(address);
+  }
+
+  /**
+   * probe to see if the address
+   * @param address network address
+   * @return true if the scheduler address is set to
+   * something other than 0.0.0.0
+   */
+  public static boolean isAddressDefined(InetSocketAddress address) {
+    if (address == null || address.getHostString() == null) {
+      return false;
+    }
+    return !(address.getHostString().equals("0.0.0.0"));
+  }
+
+  public static void setRmAddress(Configuration conf, String rmAddr) {
+    conf.set(YarnConfiguration.RM_ADDRESS, rmAddr);
+  }
+
+  public static void setRmSchedulerAddress(Configuration conf, String rmAddr) {
+    conf.set(YarnConfiguration.RM_SCHEDULER_ADDRESS, rmAddr);
+  }
+
+  public static boolean hasAppFinished(ApplicationReport report) {
+    return report == null ||
+           report.getYarnApplicationState().ordinal() >=
+           YarnApplicationState.FINISHED.ordinal();
+  }
+
+  public static String containerToString(Container container) {
+    if (container == null) {
+      return "null container";
+    }
+    return String.format(Locale.ENGLISH,
+        "ContainerID=%s nodeID=%s http=%s priority=%s resource=%s",
+        container.getId(),
+        container.getNodeId(),
+        container.getNodeHttpAddress(),
+        container.getPriority(),
+        container.getResource());
+  }
+
+  /**
+   * convert an AM report to a string for diagnostics
+   * @param report the report
+   * @return the string value
+   */
+  public static String reportToString(ApplicationReport report) {
+    if (report == null) {
+      return "Null application report";
+    }
+
+    return "App " + report.getName() + "/" + report.getApplicationType() +
+           "# " +
+           report.getApplicationId() + " user " + report.getUser() +
+           " is in state " + report.getYarnApplicationState() +
+           " RPC: " + report.getHost() + ":" + report.getRpcPort() +
+           " URL: " + report.getOriginalTrackingUrl();
+  }
+
+  /**
+   * Convert a YARN URL into a string value of a normal URL
+   * @param url URL
+   * @return string representatin
+   */
+  public static String stringify(org.apache.hadoop.yarn.api.records.URL url) {
+    StringBuilder builder = new StringBuilder();
+    builder.append(url.getScheme()).append("://");
+    if (url.getHost() != null) {
+      builder.append(url.getHost()).append(":").append(url.getPort());
+    }
+    builder.append(url.getFile());
+    return builder.toString();
+  }
+
+  public static int findFreePort(int start, int limit) {
+    if (start == 0) {
+      //bail out if the default is "dont care"
+      return 0;
+    }
+    int found = 0;
+    int port = start;
+    int finish = start + limit;
+    while (found == 0 && port < finish) {
+      if (isPortAvailable(port)) {
+        found = port;
+      } else {
+        port++;
+      }
+    }
+    return found;
+  }
+
+  /**
+   * Get a random open port
+   * @return true if the port was available for listening on
+   */
+  public static int getOpenPort() throws IOException {
+    ServerSocket socket = null;
+    try {
+      socket = new ServerSocket(0);
+      return socket.getLocalPort();
+    } finally {
+      if (socket != null) {
+        socket.close();
+      }
+    }
+  }
+
+  /**
+   * See if a port is available for listening on by trying to listen
+   * on it and seeing if that works or fails.
+   * @param port port to listen to
+   * @return true if the port was available for listening on
+   */
+  public static boolean isPortAvailable(int port) {
+    try {
+      ServerSocket socket = new ServerSocket(port);
+      socket.close();
+      return true;
+    } catch (IOException e) {
+      return false;
+    }
+  }
+
+  /**
+   * Build the environment map from a role option map, finding all entries
+   * beginning with "env.", adding them to a map of (prefix-removed)
+   * env vars
+   * @param roleOpts role options. This can be null, meaning the
+   * role is undefined
+   * @return a possibly empty map of environment variables.
+   */
+  public static Map<String, String> buildEnvMap(Map<String, String> roleOpts) {
+    return buildEnvMap(roleOpts, null);
+  }
+
+  public static Map<String, String> buildEnvMap(Map<String, String> roleOpts,
+      Map<String,String> tokenMap) {
+    Map<String, String> env = new HashMap<>();
+    if (roleOpts != null) {
+      for (Map.Entry<String, String> entry : roleOpts.entrySet()) {
+        String key = entry.getKey();
+        if (key.startsWith(RoleKeys.ENV_PREFIX)) {
+          String envName = key.substring(RoleKeys.ENV_PREFIX.length());
+          if (!envName.isEmpty()) {
+            String value = entry.getValue();
+            if (tokenMap != null) {
+              for (Map.Entry<String,String> token : tokenMap.entrySet()) {
+                value = value.replaceAll(Pattern.quote(token.getKey()),
+                    token.getValue());
+              }
+            }
+            env.put(envName, value);
+          }
+        }
+      }
+    }
+    return env;
+  }
+
+  /**
+   * Apply a set of command line options to a cluster role map
+   * @param clusterRoleMap cluster role map to merge onto
+   * @param commandOptions command opts
+   */
+  public static void applyCommandLineRoleOptsToRoleMap(
+      Map<String, Map<String, String>> clusterRoleMap,
+      Map<String, Map<String, String>> commandOptions) {
+    for (Map.Entry<String, Map<String, String>> entry : commandOptions.entrySet()) {
+      String key = entry.getKey();
+      Map<String, String> optionMap = entry.getValue();
+      Map<String, String> existingMap = clusterRoleMap.get(key);
+      if (existingMap == null) {
+        existingMap = new HashMap<String, String>();
+      }
+      log.debug("Overwriting role options with command line values {}",
+          stringifyMap(optionMap));
+      mergeMap(existingMap, optionMap);
+      //set or overwrite the role
+      clusterRoleMap.put(key, existingMap);
+    }
+  }
+
+  /**
+   * verify that the supplied cluster name is valid
+   * @param clustername cluster name
+   * @throws BadCommandArgumentsException if it is invalid
+   */
+  public static void validateClusterName(String clustername) throws
+      BadCommandArgumentsException {
+    if (!isClusternameValid(clustername)) {
+      throw new BadCommandArgumentsException(
+          "Illegal cluster name: " + clustername);
+    }
+  }
+
+  /**
+   * Verify that a Kerberos principal has been set -if not fail
+   * with an error message that actually tells you what is missing
+   * @param conf configuration to look at
+   * @param principal key of principal
+   * @throws BadConfigException if the key is not set
+   */
+  public static void verifyPrincipalSet(Configuration conf,
+      String principal) throws
+      BadConfigException {
+    String principalName = conf.get(principal);
+    if (principalName == null) {
+      throw new BadConfigException("Unset Kerberos principal : %s",
+          principal);
+    }
+    log.debug("Kerberos princial {}={}", principal, principalName);
+  }
+
+  /**
+   * Flag to indicate whether the cluster is in secure mode
+   * @param conf configuration to look at
+   * @return true if the slider client/service should be in secure mode
+   */
+  public static boolean isHadoopClusterSecure(Configuration conf) {
+    return SecurityUtil.getAuthenticationMethod(conf) !=
+           UserGroupInformation.AuthenticationMethod.SIMPLE;
+  }
+
+  /**
+   * Init security if the cluster configuration declares the cluster is secure
+   * @param conf configuration to look at
+   * @return true if the cluster is secure
+   * @throws IOException cluster is secure
+   * @throws SliderException the configuration/process is invalid
+   */
+  public static boolean maybeInitSecurity(Configuration conf) throws
+      IOException,
+      SliderException {
+    boolean clusterSecure = isHadoopClusterSecure(conf);
+    if (clusterSecure) {
+      log.debug("Enabling security");
+      initProcessSecurity(conf);
+    }
+    return clusterSecure;
+  }
+
+  /**
+   * Turn on security. This is setup to only run once.
+   * @param conf configuration to build up security
+   * @return true if security was initialized in this call
+   * @throws IOException IO/Net problems
+   * @throws BadConfigException the configuration and system state are inconsistent
+   */
+  public static boolean initProcessSecurity(Configuration conf) throws
+      IOException,
+      SliderException {
+
+    if (processSecurityAlreadyInitialized.compareAndSet(true, true)) {
+      //security is already inited
+      return false;
+    }
+
+    log.info("JVM initialized into secure mode with kerberos realm {}",
+        SliderUtils.getKerberosRealm());
+    //this gets UGI to reset its previous world view (i.e simple auth)
+    //security
+    log.debug("java.security.krb5.realm={}",
+        System.getProperty(JAVA_SECURITY_KRB5_REALM, ""));
+    log.debug("java.security.krb5.kdc={}",
+        System.getProperty(JAVA_SECURITY_KRB5_KDC, ""));
+    log.debug("hadoop.security.authentication={}",
+        conf.get(CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHENTICATION));
+    log.debug("hadoop.security.authorization={}",
+        conf.get(CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHORIZATION));
+    UserGroupInformation.setConfiguration(conf);
+    UserGroupInformation authUser = UserGroupInformation.getCurrentUser();
+    log.debug("Authenticating as {}", authUser);
+    log.debug("Login user is {}", UserGroupInformation.getLoginUser());
+    if (!UserGroupInformation.isSecurityEnabled()) {
+      throw new SliderException(LauncherExitCodes.EXIT_UNAUTHORIZED,
+          "Although secure mode is enabled," +
+         "the application has already set up its user as an insecure entity %s",
+          authUser);
+    }
+    if (authUser.getAuthenticationMethod() ==
+        UserGroupInformation.AuthenticationMethod.SIMPLE) {
+      throw new BadConfigException("Auth User is not Kerberized %s" +
+         " -security has already been set up with the wrong authentication method. "
+         + "This can occur if a file system has already been created prior to the loading of "
+         + "the security configuration.",
+          authUser);
+
+    }
+
+    SliderUtils.verifyPrincipalSet(conf, YarnConfiguration.RM_PRINCIPAL);
+    SliderUtils.verifyPrincipalSet(conf, SliderXmlConfKeys.DFS_NAMENODE_KERBEROS_PRINCIPAL_KEY);
+    return true;
+  }
+
+  /**
+   * Force an early login: This catches any auth problems early rather than
+   * in RPC operations
+   * @throws IOException if the login fails
+   */
+  public static void forceLogin() throws IOException {
+    if (UserGroupInformation.isSecurityEnabled()) {
+      if (UserGroupInformation.isLoginKeytabBased()) {
+        UserGroupInformation.getLoginUser().reloginFromKeytab();
+      } else {
+        UserGroupInformation.getLoginUser().reloginFromTicketCache();
+      }
+    }
+  }
+
+  /**
+   * Submit a JAR containing a specific class and map it
+   * @param providerResources provider map to build up
+   * @param sliderFileSystem remote fs
+   * @param clazz class to look for
+   * @param libdir lib directory
+   * @param jarName <i>At the destination</i>
+   * @return the local resource ref
+   * @throws IOException trouble copying to HDFS
+   */
+  public static LocalResource putJar(Map<String, LocalResource> providerResources,
+      SliderFileSystem sliderFileSystem,
+      Class clazz,
+      Path tempPath,
+      String libdir,
+      String jarName
+  )
+      throws IOException, SliderException {
+    LocalResource res = sliderFileSystem.submitJarWithClass(
+        clazz,
+        tempPath,
+        libdir,
+        jarName);
+    providerResources.put(libdir + "/" + jarName, res);
+    return res;
+  }
+
+  /**
+   * Submit a JAR containing and map it
+   * @param providerResources provider map to build up
+   * @param sliderFileSystem remote fs
+   * @param libDir lib directory
+   * @param srcPath copy jars from
+   * @throws IOException, SliderException trouble copying to HDFS
+   */
+  public static void putAllJars(Map<String, LocalResource> providerResources,
+                                SliderFileSystem sliderFileSystem,
+                                Path tempPath,
+                                String libDir,
+                                String srcPath) throws IOException, SliderException {
+    log.info("Loading all dependencies from {}", srcPath);
+    if (SliderUtils.isSet(srcPath)) {
+      File srcFolder = new File(srcPath);
+      FilenameFilter jarFilter = createJarFilter();
+      File[] listOfJars = srcFolder.listFiles(jarFilter);
+      if (listOfJars == null || listOfJars.length == 0) {
+        return;
+      }
+      for (File jarFile : listOfJars) {
+        LocalResource res = sliderFileSystem.submitFile(jarFile, tempPath, libDir, jarFile.getName());
+        providerResources.put(libDir + "/" + jarFile.getName(), res);
+      }
+    }
+  }
+
+  /**
+   * Accept all filenames ending with {@code .jar}
+   * @return a filename filter
+   */
+  public static FilenameFilter createJarFilter() {
+    return new FilenameFilter() {
+      public boolean accept(File dir, String name) {
+        return name.toLowerCase(Locale.ENGLISH).endsWith(".jar");
+      }
+    };
+  }
+
+  /**
+   * Submit the AM tar.gz containing all dependencies and map it
+   * @param providerResources provider map to build up
+   * @param sliderFileSystem remote fs
+   * @throws IOException, SliderException trouble copying to HDFS
+   */
+  public static void putAmTarGzipAndUpdate(
+      Map<String, LocalResource> providerResources,
+      SliderFileSystem sliderFileSystem
+  ) throws IOException, SliderException {
+    log.info("Loading all dependencies from {}{}",
+        SliderKeys.SLIDER_DEPENDENCY_TAR_GZ_FILE_NAME,
+        SliderKeys.SLIDER_DEPENDENCY_TAR_GZ_FILE_EXT);
+    sliderFileSystem.submitTarGzipAndUpdate(providerResources);
+  }
+
+  public static Map<String, Map<String, String>> deepClone(Map<String, Map<String, String>> src) {
+    Map<String, Map<String, String>> dest = new HashMap<>();
+    for (Map.Entry<String, Map<String, String>> entry : src.entrySet()) {
+      dest.put(entry.getKey(), stringMapClone(entry.getValue()));
+    }
+    return dest;
+  }
+
+  public static Map<String, String> stringMapClone(Map<String, String> src) {
+    Map<String, String> dest = new HashMap<>();
+    return mergeEntries(dest, src.entrySet());
+  }
+
+  /**
+   * List a directory in the local filesystem
+   * @param dir directory
+   * @return a listing, one to a line
+   */
+  public static String listDir(File dir) {
+    if (dir == null) {
+      return "";
+    }
+    String[] confDirEntries = dir.list();
+    if (confDirEntries == null) {
+      return "";
+    }
+    StringBuilder builder = new StringBuilder();
+    for (String entry : confDirEntries) {
+      builder.append(entry).append("\n");
+    }
+    return builder.toString();
+  }
+
+  /**
+   * Create a file:// path from a local file
+   * @param file file to point the path
+   * @return a new Path
+   */
+  public static Path createLocalPath(File file) {
+    return new Path(file.toURI());
+  }
+
+  /**
+   * Get the current user -relays to
+   * {@link UserGroupInformation#getCurrentUser()}
+   * with any Slider-specific post processing and exception handling
+   * @return user info
+   * @throws IOException on a failure to get the credentials
+   */
+  public static UserGroupInformation getCurrentUser() throws IOException {
+
+    try {
+      UserGroupInformation currentUser = UserGroupInformation.getCurrentUser();
+      return currentUser;
+    } catch (IOException e) {
+      log.info("Failed to get user info", e);
+      throw e;
+    }
+  }
+
+  public static String getKerberosRealm() {
+    try {
+      return KerberosUtil.getDefaultRealm();
+    } catch (Exception e) {
+      log.debug("introspection into JVM internals failed", e);
+      return "(unknown)";
+
+    }
+  }
+
+  /**
+   * Register the client resource in
+   * {@link SliderKeys#SLIDER_CLIENT_XML}
+   * for Configuration instances.
+   *
+   * @return true if the resource could be loaded
+   */
+  public static URL registerClientResource() {
+    return ConfigHelper.registerDefaultResource(SliderKeys.SLIDER_CLIENT_XML);
+  }
+  
+  /**
+   * Attempt to load the slider client resource. If the
+   * resource is not on the CP an empty config is returned.
+   * @return a config
+   */
+  public static Configuration loadSliderClientXML() {
+    return ConfigHelper.loadFromResource(SliderKeys.SLIDER_CLIENT_XML);
+  }
+
+  /**
+   * Convert a char sequence to a string.
+   * This ensures that comparisons work
+   * @param charSequence source
+   * @return the string equivalent
+   */
+  public static String sequenceToString(CharSequence charSequence) {
+    StringBuilder stringBuilder = new StringBuilder(charSequence);
+    return stringBuilder.toString();
+  }
+
+  /**
+   * Build up the classpath for execution
+   * -behaves very differently on a mini test cluster vs a production
+   * production one.
+   *
+   * @param sliderConfDir relative path to the dir containing slider config
+   *                      options to put on the classpath -or null
+   * @param libdir directory containing the JAR files
+   * @param config the configuration
+   * @param usingMiniMRCluster flag to indicate the MiniMR cluster is in use
+   * (and hence the current classpath should be used, not anything built up)
+   * @return a classpath
+   */
+  public static ClasspathConstructor buildClasspath(String sliderConfDir,
+      String libdir,
+      Configuration config,
+      SliderFileSystem sliderFileSystem,
+      boolean usingMiniMRCluster) {
+
+    ClasspathConstructor classpath = new ClasspathConstructor();
+
+    // add the runtime classpath needed for tests to work
+    if (usingMiniMRCluster) {
+      // for mini cluster we pass down the java CP properties
+      // and nothing else
+      classpath.appendAll(classpath.localJVMClasspath());
+    } else {
+      if (sliderConfDir != null) {
+        classpath.addClassDirectory(sliderConfDir);
+      }
+      classpath.addLibDir(libdir);
+      if (sliderFileSystem.isFile(sliderFileSystem.getDependencyTarGzip())) {
+        classpath.addLibDir(SliderKeys.SLIDER_DEPENDENCY_LOCALIZED_DIR_LINK);
+      } else {
+        log.info(
+            "For faster submission of apps, upload dependencies using cmd {} {}",
+            SliderActions.ACTION_DEPENDENCY, Arguments.ARG_UPLOAD);
+      }
+      classpath.addRemoteClasspathEnvVar();
+      classpath.append(ApplicationConstants.Environment.HADOOP_CONF_DIR.$$());
+    }
+    return classpath;
+  }
+
+  /**
+   * Verify that a path refers to a directory. If not
+   * logs the parent dir then throws an exception
+   * @param dir the directory
+   * @param errorlog log for output on an error
+   * @throws FileNotFoundException if it is not a directory
+   */
+  public static void verifyIsDir(File dir, Logger errorlog) throws
+      FileNotFoundException {
+    if (!dir.exists()) {
+      errorlog.warn("contents of {}: {}", dir,
+          listDir(dir.getParentFile()));
+      throw new FileNotFoundException(dir.toString());
+    }
+    if (!dir.isDirectory()) {
+      errorlog.info("contents of {}: {}", dir,
+          listDir(dir.getParentFile()));
+      throw new FileNotFoundException(
+          "Not a directory: " + dir);
+    }
+  }
+
+  /**
+   * Verify that a file exists
+   * @param file file
+   * @param errorlog log for output on an error
+   * @throws FileNotFoundException
+   */
+  public static void verifyFileExists(File file, Logger errorlog) throws
+      FileNotFoundException {
+    if (!file.exists()) {
+      errorlog.warn("contents of {}: {}", file,
+          listDir(file.getParentFile()));
+      throw new FileNotFoundException(file.toString());
+    }
+    if (!file.isFile()) {
+      throw new FileNotFoundException("Not a file: " + file.toString());
+    }
+  }
+
+  /**
+   * verify that a config option is set
+   * @param configuration config
+   * @param key key
+   * @return the value, in case it needs to be verified too
+   * @throws BadConfigException if the key is missing
+   */
+  public static String verifyOptionSet(Configuration configuration, String key,
+      boolean allowEmpty) throws BadConfigException {
+    String val = configuration.get(key);
+    if (val == null) {
+      throw new BadConfigException(
+          "Required configuration option \"%s\" not defined ", key);
+    }
+    if (!allowEmpty && val.isEmpty()) {
+      throw new BadConfigException(
+          "Configuration option \"%s\" must not be empty", key);
+    }
+    return val;
+  }
+
+  /**
+   * Verify that a keytab property is defined and refers to a non-empty file
+   *
+   * @param siteConf configuration
+   * @param prop property to look for
+   * @return the file referenced
+   * @throws BadConfigException on a failure
+   */
+  public static File verifyKeytabExists(Configuration siteConf,
+      String prop) throws
+      BadConfigException {
+    String keytab = siteConf.get(prop);
+    if (keytab == null) {
+      throw new BadConfigException("Missing keytab property %s",
+          prop);
+
+    }
+    File keytabFile = new File(keytab);
+    if (!keytabFile.exists()) {
+      throw new BadConfigException("Missing keytab file %s defined in %s",
+          keytabFile,
+          prop);
+    }
+    if (keytabFile.length() == 0 || !keytabFile.isFile()) {
+      throw new BadConfigException("Invalid keytab file %s defined in %s",
+          keytabFile,
+          prop);
+    }
+    return keytabFile;
+  }
+
+  /**
+   * Convert an epoch time to a GMT time. This
+   * uses the deprecated Date.toString() operation,
+   * so is in one place to reduce the number of deprecation warnings.
+   * @param time timestamp
+   * @return string value as ISO-9601
+   */
+  @SuppressWarnings({"CallToDateToString", "deprecation"})
+  public static String toGMTString(long time) {
+    return new Date(time).toGMTString();
+  }
+
+  /**
+   * Add the cluster build information; this will include Hadoop details too
+   * @param info cluster info
+   * @param prefix prefix for the build info
+   */
+  public static void addBuildInfo(Map<String, String> info, String prefix) {
+
+    Properties props = SliderVersionInfo.loadVersionProperties();
+    info.put(prefix + "." + SliderVersionInfo.APP_BUILD_INFO, props.getProperty(
+        SliderVersionInfo.APP_BUILD_INFO));
+    info.put(prefix + "." + SliderVersionInfo.HADOOP_BUILD_INFO,
+        props.getProperty(SliderVersionInfo.HADOOP_BUILD_INFO));
+
+    info.put(prefix + "." + SliderVersionInfo.HADOOP_DEPLOYED_INFO,
+        VersionInfo.getBranch() + " @" + VersionInfo.getSrcChecksum());
+  }
+
+  /**
+   * Set the time for an information (human, machine) timestamp pair of fields.
+   * The human time is the time in millis converted via the {@link Date} class.
+   * @param info info fields
+   * @param keyHumanTime name of human time key
+   * @param keyMachineTime name of machine time
+   * @param time timestamp
+   */
+  public static void setInfoTime(Map info,
+      String keyHumanTime,
+      String keyMachineTime,
+      long time) {
+    info.put(keyHumanTime, SliderUtils.toGMTString(time));
+    info.put(keyMachineTime, Long.toString(time));
+  }
+
+  public static Path extractImagePath(CoreFileSystem fs,
+      MapOperations internalOptions) throws
+      SliderException, IOException {
+    Path imagePath;
+    String imagePathOption =
+        internalOptions.get(InternalKeys.INTERNAL_APPLICATION_IMAGE_PATH);
+    String appHomeOption =
+        internalOptions.get(InternalKeys.INTERNAL_APPLICATION_HOME);
+    if (!isUnset(imagePathOption)) {
+      if (!isUnset(appHomeOption)) {
+        throw new BadClusterStateException(
+            ErrorStrings.E_BOTH_IMAGE_AND_HOME_DIR_SPECIFIED);
+      }
+      imagePath = fs.createPathThatMustExist(imagePathOption);
+    } else {
+      imagePath = null;
+      if (isUnset(appHomeOption)) {
+        throw new BadClusterStateException(
+            ErrorStrings.E_NO_IMAGE_OR_HOME_DIR_SPECIFIED);
+      }
+    }
+    return imagePath;
+  }
+
+  /**
+   * trigger a  JVM halt with no clean shutdown at all
+   * @param status status code for exit
+   * @param text text message
+   * @param delay delay in millis
+   * @return the timer (assuming the JVM hasn't halted yet)
+   *
+   */
+  public static Timer haltAM(int status, String text, int delay) {
+
+    Timer timer = new Timer("halt timer", false);
+    timer.schedule(new DelayedHalt(status, text), delay);
+    return timer;
+  }
+
+  public static String propertiesToString(Properties props) {
+    TreeSet<String> keys = new TreeSet<>(props.stringPropertyNames());
+    StringBuilder builder = new StringBuilder();
+    for (String key : keys) {
+      builder.append(key)
+             .append("=")
+             .append(props.getProperty(key))
+             .append("\n");
+    }
+    return builder.toString();
+  }
+
+  /**
+   * Add a subpath to an existing URL. This extends
+   * the path, inserting a / between all entries
+   * if needed.
+   * @param base base path/URL
+   * @param path subpath
+   * @return base+"/"+subpath
+   */
+  public static String appendToURL(String base, String path) {
+    StringBuilder fullpath = new StringBuilder(base);
+    if (!base.endsWith("/")) {
+      fullpath.append("/");
+    }
+    if (path.startsWith("/")) {
+      fullpath.append(path.substring(1));
+    } else {
+      fullpath.append(path);
+    }
+    return fullpath.toString();
+  }
+
+  /**
+   * Append a list of paths, inserting "/" signs as appropriate
+   * @param base base path/URL
+   * @param paths subpaths
+   * @return base+"/"+paths[0]+"/"+paths[1]...
+   */
+  public static String appendToURL(String base, String... paths) {
+    String result = base;
+    for (String path : paths) {
+      result = appendToURL(result, path);
+    }
+    return result;
+  }
+
+
+  /**
+   * Truncate the given string to a maximum length provided
+   * with a pad (...) added to the end if expected size if more than 10.
+   * @param toTruncate string to truncate; may be null
+   * @param maxSize maximum size
+   * @return the truncated/padded string. 
+   */
+  public static String truncate(String toTruncate, int maxSize) {
+    if (toTruncate == null || maxSize < 1
+        || toTruncate.length() <= maxSize) {
+      return toTruncate;
+    }
+
+    String pad = "...";
+    if (maxSize < 10) {
+      pad = "";
+    }
+    return toTruncate.substring(0, maxSize - pad.length()).concat(pad);
+  }
+
+  /**
+   * Get a string node label value from a node report
+   * @param report node report
+   * @return a single trimmed label or ""
+   */
+  public static String extractNodeLabel(NodeReport report) {
+    Set<String> newlabels = report.getNodeLabels();
+    if (newlabels != null && !newlabels.isEmpty()) {
+      return newlabels.iterator().next().trim();
+    } else {
+      return "";
+    }
+  }
+
+  /**
+   * Callable for async/scheduled halt
+   */
+  public static class DelayedHalt extends TimerTask {
+    private final int status;
+    private final String text;
+
+    public DelayedHalt(int status, String text) {
+      this.status = status;
+      this.text = text;
+    }
+
+    @Override
+    public void run() {
+      try {
+        ExitUtil.halt(status, text);
+        //this should never be reached
+      } catch (ExitUtil.HaltException e) {
+        log.info("Halt failed");
+      }
+    }
+  }
+
+  /**
+   * A compareTo function that converts the result of a long
+   * comparision into the integer that <code>Comparable</code>
+   * expects.
+   * @param left left side
+   * @param right right side
+   * @return -1, 0, 1 depending on the diff
+   */
+  public static int compareTo(long left, long right) {
+    long diff = left - right;
+    if (diff < 0) {
+      return -1;
+    }
+    if (diff > 0) {
+      return 1;
+    }
+    return 0;
+  }
+
+  /**
+   * Given a source folder create zipped file
+   *
+   * @param srcFolder
+   * @param zipFile
+   *
+   * @throws IOException
+   */
+  public static void zipFolder(File srcFolder, File zipFile) throws IOException {
+    log.info("Zipping folder {} to {}", srcFolder.getAbsolutePath(), zipFile.getAbsolutePath());
+    List<String> files = new ArrayList<>();
+    generateFileList(files, srcFolder, srcFolder, true);
+
+    byte[] buffer = new byte[1024];
+
+    try (FileOutputStream fos = new FileOutputStream(zipFile)) {
+      try (ZipOutputStream zos = new ZipOutputStream(fos)) {
+
+        for (String file : files) {
+          ZipEntry ze = new ZipEntry(file);
+          zos.putNextEntry(ze);
+          try (FileInputStream in = new FileInputStream(srcFolder + File.separator + file)) {
+            int len;
+            while ((len = in.read(buffer)) > 0) {
+              zos.write(buffer, 0, len);
+            }
+          }
+        }
+      }
+    }
+  }
+
+  /**
+   * Given a source folder create a tar.gz file
+   * 
+   * @param srcFolder
+   * @param tarGzipFile
+   * 
+   * @throws IOException
+   */
+  public static void tarGzipFolder(File srcFolder, File tarGzipFile,
+      FilenameFilter filter) throws IOException {
+    log.info("Tar-gzipping folder {} to {}", srcFolder.getAbsolutePath(),
+        tarGzipFile.getAbsolutePath());
+    List<String> files = new ArrayList<>();
+    generateFileList(files, srcFolder, srcFolder, true, filter);
+
+    try(TarArchiveOutputStream taos =
+            new TarArchiveOutputStream(new GZIPOutputStream(
+        new BufferedOutputStream(new FileOutputStream(tarGzipFile))))) {
+      for (String file : files) {
+        File srcFile = new File(srcFolder, file);
+        TarArchiveEntry tarEntry = new TarArchiveEntry(
+            srcFile, file);
+        taos.putArchiveEntry(tarEntry);
+        try(FileInputStream in = new FileInputStream(srcFile)) {
+          org.apache.commons.io.IOUtils.copy(in, taos);
+        }
+        taos.flush();
+        taos.closeArchiveEntry();
+      }
+    }
+  }
+
+  /**
+   * Retrieve the HDP version if it is an HDP cluster, or null otherwise. It
+   * first checks if system property HDP_VERSION is defined. If not it checks if
+   * system env HDP_VERSION is defined.
+   * 
+   * @return HDP version (if defined) or null otherwise
+   */
+  public static String getHdpVersion() {
+    String hdpVersion = System
+        .getProperty(SliderKeys.HDP_VERSION_PROP_NAME);
+    if (StringUtils.isEmpty(hdpVersion)) {
+      hdpVersion = System.getenv(SliderKeys.HDP_VERSION_PROP_NAME);
+    }
+    return hdpVersion;
+  }
+
+  /**
+   * Query to find if it is an HDP cluster
+   * 
+   * @return true if this is invoked in an HDP cluster or false otherwise
+   */
+  public static boolean isHdp() {
+    return StringUtils.isNotEmpty(getHdpVersion());
+  }
+
+  /**
+   * Retrieve the version of the current Slider install
+   * 
+   * @return the version string of the Slider release
+   */
+  public static String getSliderVersion() {
+    if (isHdp()) {
+      return getHdpVersion();
+    } else {
+      Properties props = SliderVersionInfo.loadVersionProperties();
+      return props.getProperty(SliderVersionInfo.APP_VERSION);
+    }
+  }
+
+  private static void generateFileList(List<String> fileList, File node,
+      File rootFolder, Boolean relative) {
+    generateFileList(fileList, node, rootFolder, relative, null);
+  }
+
+  private static void generateFileList(List<String> fileList, File node,
+      File rootFolder, Boolean relative, FilenameFilter filter) {
+    if (node.isFile()) {
+      String fileFullPath = node.toString();
+      if (relative) {
+        fileList.add(fileFullPath.substring(rootFolder.toString().length() + 1,
+            fileFullPath.length()));
+      } else {
+        fileList.add(fileFullPath);
+      }
+    }
+
+    if (node.isDirectory()) {
+      String[] subNode = node.list(filter);
+      if (subNode == null || subNode.length == 0) {
+          return;
+      }
+      for (String filename : subNode) {
+        generateFileList(fileList, new File(node, filename), rootFolder,
+            relative, filter);
+      }
+    }
+  }
+
+  /**
+   * This wraps ApplicationReports and generates a string version
+   * iff the toString() operator is invoked
+   */
+  public static class OnDemandReportStringifier {
+    private final ApplicationReport report;
+
+    public OnDemandReportStringifier(ApplicationReport report) {
+      this.report = report;
+    }
+
+    @Override
+    public String toString() {
+      return appReportToString(report, "\n");
+    }
+  }
+
+  public static InputStream getApplicationResourceInputStream(FileSystem fs,
+      Path appPath,
+      String entry)
+      throws IOException {
+    InputStream is = null;
+    try(FSDataInputStream appStream = fs.open(appPath)) {
+      ZipArchiveInputStream zis = new ZipArchiveInputStream(appStream);
+      ZipArchiveEntry zipEntry;
+      boolean done = false;
+      while (!done && (zipEntry = zis.getNextZipEntry()) != null) {
+        if (entry.equals(zipEntry.getName())) {
+          int size = (int) zipEntry.getSize();
+          if (size != -1) {
+            log.info("Reading {} of size {}", zipEntry.getName(),
+                zipEntry.getSize());
+            byte[] content = new byte[size];
+            int offset = 0;
+            while (offset < size) {
+              offset += zis.read(content, offset, size - offset);
+            }
+            is = new ByteArrayInputStream(content);
+          } else {
+            log.debug("Size unknown. Reading {}", zipEntry.getName());
+            ByteArrayOutputStream baos = new ByteArrayOutputStream();
+            while (true) {
+              int byteRead = zis.read();
+              if (byteRead == -1) {
+                break;
+              }
+              baos.write(byteRead);
+            }
+            is = new ByteArrayInputStream(baos.toByteArray());
+          }
+          done = true;
+        }
+      }
+    }
+
+    return is;
+  }
+
+  /**
+   * Check for any needed libraries being present. On Unix none are needed;
+   * on windows they must be present
+   * @return true if all is well
+   */
+  public static String checkForRequiredNativeLibraries() {
+
+    if (!Shell.WINDOWS) {
+      return "";
+    }
+    StringBuilder errorText = new StringBuilder("");
+    if (!NativeIO.isAvailable()) {
+      errorText.append("No native IO library. ");
+    }
+    try {
+      String path = Shell.getQualifiedBinPath(WINUTILS);
+      log.debug("winutils is at {}", path);
+    } catch (IOException e) {
+      errorText.append("No " + WINUTILS);
+      log.warn("No winutils: {}", e, e);
+    }
+    try {
+      File target = new File("target");
+      FileUtil.canRead(target);
+    } catch (UnsatisfiedLinkError e) {
+      log.warn("Failing to link to native IO methods: {}", e, e);
+      errorText.append("No native IO methods");
+    }
+    return errorText.toString();
+  }
+
+  /**
+   * Strictly verify that windows utils is present.
+   * Checks go as far as opening the file and looking for
+   * the headers. 
+   * @throws IOException on any problem reading the file
+   * @throws FileNotFoundException if the file is not considered valid
+   */
+  public static void maybeVerifyWinUtilsValid() throws
+      IOException,
+      SliderException {
+    String errorText = SliderUtils.checkForRequiredNativeLibraries();
+    if (!errorText.isEmpty()) {
+      throw new BadClusterStateException(errorText);
+    }
+  }
+
+  public static void verifyIsFile(String program, File exe) throws
+      FileNotFoundException {
+    if (!exe.isFile()) {
+      throw new FileNotFoundException(program
+                                      + " at " + exe
+                                      + " is not a file");
+
+    }
+  }
+
+  public static void verifyFileSize(String program,
+      File exe,
+      int minFileSize) throws FileNotFoundException {
+    if (exe.length() < minFileSize) {
+      throw new FileNotFoundException(program
+                                      + " at " + exe
+                                      + " is too short to be an executable");
+    }
+  }
+
+  /**
+   * Look for the windows executable and check it has the right headers.
+   * <code>File.canRead()</code> doesn't work on windows, so the reading
+   * is mandatory.
+   *
+   * @param program program name for errors
+   * @param exe executable
+   * @throws IOException IOE
+   */
+  public static void verifyWindowsExe(String program, File exe)
+      throws IOException {
+    verifyIsFile(program, exe);
+
+    verifyFileSize(program, exe, 0x100);
+
+    // now read two bytes and verify the header.
+    try(FileReader reader = new FileReader(exe)) {
+      int[] header = new int[2];
+      header[0] = reader.read();
+      header[1] = reader.read();
+      if ((header[0] != 'M' || header[1] != 'Z')) {
+        throw new FileNotFoundException(program
+                                        + " at " + exe
+                                        + " is not a windows executable file");
+      }
+    }
+  }
+
+  /**
+   * Verify that a Unix exe works
+   * @param program program name for errors
+   * @param exe executable
+   * @throws IOException IOE
+
+   */
+  public static void verifyUnixExe(String program, File exe)
+      throws IOException {
+    verifyIsFile(program, exe);
+
+    // read flag
+    if (!exe.canRead()) {
+      throw new IOException("Cannot read " + program + " at " + exe);
+    }
+    // exe flag
+    if (!exe.canExecute()) {
+      throw new IOException("Cannot execute " + program + " at " + exe);
+    }
+  }
+
+  /**
+   * Validate an executable
+   * @param program program name for errors
+   * @param exe program to look at
+   * @throws IOException
+   */
+  public static void validateExe(String program, File exe) throws IOException {
+    if (!Shell.WINDOWS) {
+      verifyWindowsExe(program, exe);
+    } else {
+      verifyUnixExe(program, exe);
+    }
+  }
+
+  /**
+   * Write bytes to a file
+   * @param outfile output file
+   * @param data data to write
+   * @param createParent flag to indicate that the parent dir should
+   * be created
+   * @throws IOException on any IO problem
+   */
+  public static void write(File outfile, byte[] data, boolean createParent)
+      throws IOException {
+    File parentDir = outfile.getCanonicalFile().getParentFile();
+    if (parentDir == null) {
+      throw new IOException(outfile.getPath() + " has no parent dir");
+    }
+    if (createParent) {
+      parentDir.mkdirs();
+    }
+    SliderUtils.verifyIsDir(parentDir, log);
+    try(FileOutputStream out = new FileOutputStream(outfile)) {
+      out.write(data);
+    }
+
+  }
+
+  /**
+   * Execute a command for a test operation
+   * @param name name in error
+   * @param status status code expected
+   * @param timeoutMillis timeout in millis for process to finish
+   * @param logger
+   * @param outputString optional string to grep for (must not span a line)
+   * @param commands commands   @return the process
+   * @throws IOException on any failure.
+   */
+  public static ForkedProcessService execCommand(String name,
+      int status,
+      long timeoutMillis,
+      Logger logger,
+      String outputString,
+      String... commands) throws IOException, SliderException {
+    Preconditions.checkArgument(isSet(name), "no name");
+    Preconditions.checkArgument(commands.length > 0, "no commands");
+    Preconditions.checkArgument(isSet(commands[0]), "empty command");
+
+    ForkedProcessService process;
+
+
+    process = new ForkedProcessService(
+        name,
+        new HashMap<String, String>(),
+        Arrays.asList(commands));
+    process.setProcessLog(logger);
+    process.init(new Configuration());
+    String errorText = null;
+    process.start();
+    try {
+      if (!process.waitForServiceToStop(timeoutMillis)) {
+        throw new TimeoutException(
+            "Process did not stop in " + timeoutMillis + "mS");
+      }
+      int exitCode = process.getExitCode();
+      List<String> recentOutput = process.getRecentOutput();
+      if (status != exitCode) {
+        // error condition
+        errorText = "Expected exit code={" + status + "}, "
+                    + "actual exit code={" + exitCode + "}";
+      } else {
+        if (isSet(outputString)) {
+          boolean found = false;
+          for (String line : recentOutput) {
+            if (line.contains(outputString)) {
+              found = true;
+              break;
+            }
+          }
+          if (!found) {
+            errorText = "Did not find \"" + outputString + "\""
+                        + " in output";
+          }
+        }
+      }
+      if (errorText == null) {
+        return process;
+      }
+
+    } catch (TimeoutException e) {
+      errorText = e.toString();
+    }
+    // error text: non null ==> operation failed
+    log.warn(errorText);
+    List<String> recentOutput = process.getRecentOutput();
+    for (String line : recentOutput) {
+      log.info(line);
+    }
+    throw new SliderException(LauncherExitCodes.EXIT_OTHER_FAILURE,
+        "Process %s failed: %s", name, errorText);
+
+  }
+
+
+  /**
+   * Validate the slider client-side execution environment.
+   * This looks for everything felt to be critical for execution, including
+   * native binaries and other essential dependencies.
+   * @param logger logger to log to on normal execution
+   * @throws IOException on IO failures
+   * @throws SliderException on validation failures
+   */
+  public static void validateSliderClientEnvironment(Logger logger) throws
+      IOException,
+      SliderException {
+    maybeVerifyWinUtilsValid();
+  }
+
+  /**
+   * Validate the slider server-side execution environment.
+   * This looks for everything felt to be critical for execution, including
+   * native binaries and other essential dependencies.
+   * @param logger logger to log to on normal execution
+   * @param dependencyChecks flag to indicate checks for agent dependencies
+   * @throws IOException on IO failures
+   * @throws SliderException on validation failures
+   */
+  public static void validateSliderServerEnvironment(Logger logger,
+      boolean dependencyChecks) throws
+      IOException,
+      SliderException {
+    maybeVerifyWinUtilsValid();
+    if (dependencyChecks) {
+      validatePythonEnv(logger);
+      validateOpenSSLEnv(logger);
+    }
+  }
+
+  public static void validateOpenSSLEnv(Logger logger) throws
+      IOException,
+      SliderException {
+    execCommand(OPENSSL, 0, 5000, logger, "OpenSSL", OPENSSL, "version");
+  }
+
+  public static void validatePythonEnv(Logger logger) throws
+      IOException,
+      SliderException {
+    execCommand(PYTHON, 0, 5000, logger, "Python", PYTHON, "-V");
+  }
+
+  /**
+   * return the path to the currently running slider command
+   *
+   * @throws NullPointerException
+   *             - If the pathname argument is null
+   * @throws SecurityException
+   *             - if a security manager exists and its checkPermission method
+   *             doesn't allow getting the ProtectionDomain
+   */
+  public static String getCurrentCommandPath() {
+    File f = new File(Slider.class.getProtectionDomain().getCodeSource()
+                                  .getLocation().getPath());
+    return f.getAbsolutePath();
+  }
+
+  /**
+   * return the HDFS path where the application package has been uploaded
+   * manually or by using slider client (install package command)
+   * 
+   * @param conf configuration
+   * @return
+   */
+  public static String getApplicationDefinitionPath(ConfTreeOperations conf)
+      throws BadConfigException {
+    String appDefPath = conf.getGlobalOptions().getMandatoryOption(
+        AgentKeys.APP_DEF);
+    return appDefPath;
+  }
+
+  /**
+   * return the path to the slider-client.xml used by the current running
+   * slider command
+   *
+   * @throws SecurityException
+   *             - if a security manager exists and its checkPermission method
+   *             denies access to the class loader for the class
+   */
+  public static String getClientConfigPath() {
+    URL path = ConfigHelper.class.getClassLoader().getResource(
+        SliderKeys.SLIDER_CLIENT_XML);
+    Preconditions.checkNotNull(path, "Failed to locate resource " + SliderKeys.SLIDER_CLIENT_XML);
+    return path.toString();
+  }
+
+  /**
+   * validate if slider-client.xml under the path can be opened
+   *
+   * @throws IOException
+   *             : the file can't be found or open
+   */
+  public static void validateClientConfigFile() throws IOException {
+    URL resURL = SliderVersionInfo.class.getClassLoader().getResource(
+        SliderKeys.SLIDER_CLIENT_XML);
+    if (resURL == null) {
+      throw new IOException(
+          "slider-client.xml doesn't exist on the path: "
+          + getClientConfigPath());
+    }
+
+    try {
+      InputStream inStream = resURL.openStream();
+      if (inStream == null) {
+        throw new IOException("slider-client.xml can't be opened");
+      }
+    } catch (IOException e) {
+      throw new IOException("slider-client.xml can't be opened: "
+                            + e.toString());
+    }
+  }
+
+  /**
+   * validate if a file on HDFS can be open
+   *
+   * @throws IOException the file can't be found or opened
+   * @throws URISyntaxException
+   */
+  public static void validateHDFSFile(SliderFileSystem sliderFileSystem,
+      String pathStr)
+      throws IOException, URISyntaxException {
+    try(InputStream inputStream =
+            sliderFileSystem.getFileSystem().open(new Path(new URI(pathStr)))) {
+      if (inputStream == null) {
+        throw new IOException("HDFS file " + pathStr + " can't be opened");
+      }
+    }
+  }
+
+  /**
+   * return the version and path of the JDK invoking the current running
+   * slider command
+   *
+   * @throws SecurityException
+   *             - if a security manager exists and its checkPropertyAccess
+   *             method doesn't allow access to the specified system property.
+   */
+  public static String getJDKInfo() {
+    String version = System.getProperty("java.version");
+    String javaHome = System.getProperty("java.home");
+    return
+        "The version of the JDK invoking the current running slider command: "
+        + version + "; The path to it is: " + javaHome;
+  }
+
+  /**
+   * return a description of whether the current user has created credential
+   * cache files from kerberos servers
+   *
+   * @throws IOException
+   * @throws BadConfigException
+   * @throws SecurityException
+   *             - if a security manager exists and its checkPropertyAccess
+   *             method doesn't allow access to the specified system property.
+   */
+  public static String checkCredentialCacheFile() throws IOException,
+      BadConfigException {
+    String result = null;
+    if (!Shell.WINDOWS) {
+      result = Shell.execCommand("klist");
+    }
+    return result;
+  }
+
+  /**
+   * Compare the times of two applications: most recent app comes first
+   * Specifically: the one whose start time value is greater.
+   */
+  private static class MostRecentlyStartedAppFirst
+      implements Comparator<ApplicationReport>, Serializable {
+    @Override
+    public int compare(ApplicationReport r1, ApplicationReport r2) {
+      long x = r1.getStartTime();
+      long y = r2.getStartTime();
+      return compareTwoLongsReverse(x, y);
+    }
+  }
+  
+  /**
+   * Compare the times of two applications: most recent app comes first.
+   * "Recent"== the app whose start time <i>or finish time</i> is the greatest.
+   */
+  private static class MostRecentlyStartedOrFinishedFirst
+      implements Comparator<ApplicationReport>, Serializable {
+    @Override
+    public int compare(ApplicationReport r1, ApplicationReport r2) {
+      long started1 = r1.getStartTime();
+      long started2 = r2.getStartTime();
+      long finished1 = r1.getFinishTime();
+      long finished2 = r2.getFinishTime();
+      long lastEvent1 = Math.max(started1, finished1);
+      long lastEvent2 = Math.max(started2, finished2);
+      return compareTwoLongsReverse(lastEvent1, lastEvent2);
+    }
+  }
+
+  /**
+   * Compare the times of two applications: most recently finished app comes first
+   * Specifically: the one whose finish time value is greater.
+   */
+  private static class MostRecentAppFinishFirst
+      implements Comparator<ApplicationReport>, Serializable {
+    @Override
+    public int compare(ApplicationReport r1, ApplicationReport r2) {
+      long x = r1.getFinishTime();
+      long y = r2.getFinishTime();
+      return compareTwoLongsReverse(x, y);
+    }
+  }
+
+  /**
+   * Compare two long values for sorting. As the return value for 
+   * comparators must be int, the simple value of <code>x-y</code>
+   * is inapplicable
+   * @param x x value
+   * @param y y value
+   * @return +ve if x is less than y, -ve if y is greater than x; 0 for equality
+   */
+  public static int compareTwoLongsReverse(long x, long y) {
+    return (x < y) ? 1 : ((x == y) ? 0 : -1);
+  }
+
+  public static String getSystemEnv(String property) {
+    return System.getenv(property);
+  }
+
+  public static Map<String, String> getSystemEnv() {
+    return System.getenv();
+  }
+
+  public static String requestToString(AMRMClient.ContainerRequest request) {
+    Preconditions.checkArgument(request != null, "Null request");
+    StringBuilder buffer = new StringBuilder(request.toString());
+    buffer.append("; ");
+    buffer.append("relaxLocality=").append(request.getRelaxLocality()).append("; ");
+    String labels = request.getNodeLabelExpression();
+    if (labels != null) {
+      buffer.append("nodeLabels=").append(labels).append("; ");
+    }
+    List<String> nodes = request.getNodes();
+    if (nodes != null) {
+      buffer.append("Nodes = [ ");
+      int size = nodes.size();
+      for (int i = 0; i < Math.min(NODE_LIST_LIMIT, size); i++) {
+        buffer.append(nodes.get(i)).append(' ');
+      }
+      if (size > NODE_LIST_LIMIT) {
+        buffer.append(String.format("...(total %d entries)", size));
+      }
+      buffer.append("]; ");
+    }
+    List<String> racks = request.getRacks();
+    if (racks != null) {
+      buffer.append("racks = [")
+          .append(join(racks, ", ", false))
+          .append("]; ");
+    }
+    return buffer.toString();
+  }
+}


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