YARN-1666. Modified RM HA handling of include/exclude node-lists to be available across RM failover by making using of a remote configuration-provider. Contributed by Xuan Gong.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1569856 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/HostsFileReader.java

@@ -25,6 +25,7 @@ import java.util.HashSet;
 import org.apache.commons.logging.LogFactory;
 import org.apache.commons.logging.Log;
 import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.classification.InterfaceStability;
 
 // Keeps track of which datanodes/tasktrackers are allowed to connect to the 
@@ -48,13 +49,30 @@ public class HostsFileReader {
     refresh();
   }
 
+  @Private
+  public HostsFileReader(String includesFile, InputStream inFileInputStream,
+      String excludesFile, InputStream exFileInputStream) throws IOException {
+    includes = new HashSet<String>();
+    excludes = new HashSet<String>();
+    this.includesFile = includesFile;
+    this.excludesFile = excludesFile;
+    refresh(inFileInputStream, exFileInputStream);
+  }
+
   public static void readFileToSet(String type,
       String filename, Set<String> set) throws IOException {
     File file = new File(filename);
     FileInputStream fis = new FileInputStream(file);
+    readFileToSetWithFileInputStream(type, filename, fis, set);
+  }
+
+  @Private
+  public static void readFileToSetWithFileInputStream(String type,
+      String filename, InputStream fileInputStream, Set<String> set)
+      throws IOException {
     BufferedReader reader = null;
     try {
-      reader = new BufferedReader(new InputStreamReader(fis));
+      reader = new BufferedReader(new InputStreamReader(fileInputStream));
       String line;
       while ((line = reader.readLine()) != null) {
         String[] nodes = line.split("[ \t\n\f\r]+");
@@ -76,21 +94,58 @@ public class HostsFileReader {
       if (reader != null) {
         reader.close();
       }
-      fis.close();
+      fileInputStream.close();
     }
   }
 
   public synchronized void refresh() throws IOException {
     LOG.info("Refreshing hosts (include/exclude) list");
+    Set<String> newIncludes = new HashSet<String>();
+    Set<String> newExcludes = new HashSet<String>();
+    boolean switchIncludes = false;
+    boolean switchExcludes = false;
     if (!includesFile.isEmpty()) {
-      Set<String> newIncludes = new HashSet<String>();
       readFileToSet("included", includesFile, newIncludes);
+      switchIncludes = true;
+    }
+    if (!excludesFile.isEmpty()) {
+      readFileToSet("excluded", excludesFile, newExcludes);
+      switchExcludes = true;
+    }
+
+    if (switchIncludes) {
       // switch the new hosts that are to be included
       includes = newIncludes;
     }
-    if (!excludesFile.isEmpty()) {
+    if (switchExcludes) {
-      Set<String> newExcludes = new HashSet<String>();
+      // switch the excluded hosts
-      readFileToSet("excluded", excludesFile, newExcludes);
+      excludes = newExcludes;
+    }
+  }
+
+  @Private
+  public synchronized void refresh(InputStream inFileInputStream,
+      InputStream exFileInputStream) throws IOException {
+    LOG.info("Refreshing hosts (include/exclude) list");
+    Set<String> newIncludes = new HashSet<String>();
+    Set<String> newExcludes = new HashSet<String>();
+    boolean switchIncludes = false;
+    boolean switchExcludes = false;
+    if (inFileInputStream != null) {
+      readFileToSetWithFileInputStream("included", includesFile,
+          inFileInputStream, newIncludes);
+      switchIncludes = true;
+    }
+    if (exFileInputStream != null) {
+      readFileToSetWithFileInputStream("excluded", excludesFile,
+          exFileInputStream, newExcludes);
+      switchExcludes = true;
+    }
+    if (switchIncludes) {
+      // switch the new hosts that are to be included
+      includes = newIncludes;
+    }
+    if (switchExcludes) {
       // switch the excluded hosts
       excludes = newExcludes;
     }

hadoop-yarn-project/CHANGES.txt

@@ -202,6 +202,10 @@ Release 2.4.0 - UNRELEASED
     be available across RM failover by making using of a remote
     configuration-provider. (Xuan Gong via vinodkv)
 
+    YARN-1666. Modified RM HA handling of include/exclude node-lists to be
+    available across RM failover by making using of a remote
+    configuration-provider. (Xuan Gong via vinodkv)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/ConfigurationProvider.java

@@ -19,6 +19,8 @@
 package org.apache.hadoop.yarn.conf;
 
 import java.io.IOException;
+import java.io.InputStream;
+
 import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.conf.Configuration;
@@ -42,15 +44,16 @@ public abstract class ConfigurationProvider {
   }
 
   /**
-   * Get the configuration and combine with bootstrapConf
+   * Opens an InputStream at the indicated file
    * @param bootstrapConf Configuration
    * @param name The configuration file name
    * @return configuration
    * @throws YarnException
    * @throws IOException
    */
-  public abstract Configuration getConfiguration(Configuration bootstrapConf,
+  public abstract InputStream getConfigurationInputStream(
-      String name) throws YarnException, IOException;
+      Configuration bootstrapConf, String name) throws YarnException,
+      IOException;
 
   /**
    * Derived classes initialize themselves using this method.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java

@@ -45,22 +45,31 @@ public class YarnConfiguration extends Configuration {
       "hadoop-policy.xml";
 
   @Private
-  public static final String YARN_SITE_XML_FILE = "yarn-site.xml";
+  public static final String YARN_SITE_CONFIGURATION_FILE = "yarn-site.xml";
+
+  private static final String YARN_DEFAULT_CONFIGURATION_FILE =
+      "yarn-default.xml";
 
   @Private
   public static final String CORE_SITE_CONFIGURATION_FILE = "core-site.xml";
 
+  @Private
+  public static final List<String> RM_CONFIGURATION_FILES =
+      Collections.unmodifiableList(Arrays.asList(
+          CS_CONFIGURATION_FILE,
+          HADOOP_POLICY_CONFIGURATION_FILE,
+          YARN_SITE_CONFIGURATION_FILE,
+          CORE_SITE_CONFIGURATION_FILE));
+
   @Evolving
   public static final int APPLICATION_MAX_TAGS = 10;
 
   @Evolving
   public static final int APPLICATION_MAX_TAG_LENGTH = 100;
 
-  private static final String YARN_DEFAULT_XML_FILE = "yarn-default.xml";
-
   static {
-    Configuration.addDefaultResource(YARN_DEFAULT_XML_FILE);
+    Configuration.addDefaultResource(YARN_DEFAULT_CONFIGURATION_FILE);
-    Configuration.addDefaultResource(YARN_SITE_XML_FILE);
+    Configuration.addDefaultResource(YARN_SITE_CONFIGURATION_FILE);
   }
 
   //Configurations

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/FileSystemBasedConfigurationProvider.java

@@ -19,6 +19,8 @@
 package org.apache.hadoop.yarn;
 
 import java.io.IOException;
+import java.io.InputStream;
+
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience.Private;
@@ -41,15 +43,27 @@ public class FileSystemBasedConfigurationProvider
   private Path configDir;
 
   @Override
-  public synchronized Configuration getConfiguration(Configuration bootstrapConf,
+  public synchronized InputStream getConfigurationInputStream(
-      String name) throws IOException, YarnException {
+      Configuration bootstrapConf, String name) throws IOException,
-    Path configPath = new Path(this.configDir, name);
+      YarnException {
-    if (!fs.exists(configPath)) {
+    if (name == null || name.isEmpty()) {
-      throw new YarnException("Can not find Configuration: " + name + " in "
+      throw new YarnException(
-          + configDir);
+          "Illegal argument! The parameter should not be null or empty");
     }
-    bootstrapConf.addResource(fs.open(configPath));
+    Path filePath;
-    return bootstrapConf;
+    if (YarnConfiguration.RM_CONFIGURATION_FILES.contains(name)) {
+      filePath = new Path(this.configDir, name);
+      if (!fs.exists(filePath)) {
+        throw new YarnException("Can not find Configuration: " + name + " in "
+            + configDir);
+      }
+    } else {
+      filePath = new Path(name);
+      if (!fs.exists(filePath)) {
+        throw new YarnException("Can not find file: " + name);
+      }
+    }
+    return fs.open(filePath);
   }
 
   @Override

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/LocalConfigurationProvider.java

@@ -18,11 +18,15 @@
 
 package org.apache.hadoop.yarn;
 
+import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
+
 import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.yarn.conf.ConfigurationProvider;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.exceptions.YarnException;
 
 @Private
@@ -30,9 +34,15 @@ import org.apache.hadoop.yarn.exceptions.YarnException;
 public class LocalConfigurationProvider extends ConfigurationProvider {
 
   @Override
-  public Configuration getConfiguration(Configuration bootstrapConf,
+  public InputStream getConfigurationInputStream(Configuration bootstrapConf,
       String name) throws IOException, YarnException {
-    return bootstrapConf;
+    if (name == null || name.isEmpty()) {
+      throw new YarnException(
+          "Illegal argument! The parameter should not be null or empty");
+    } else if (YarnConfiguration.RM_CONFIGURATION_FILES.contains(name)) {
+      return bootstrapConf.getConfResourceAsInputStream(name);
+    }
+    return new FileInputStream(name);
   }
 
   @Override

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/AdminService.java

@@ -26,7 +26,6 @@ import java.util.Set;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.yarn.LocalConfigurationProvider;
 import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.ha.HAServiceProtocol;
 import org.apache.hadoop.ha.HAServiceStatus;
@@ -313,9 +312,7 @@ public class AdminService extends CompositeService implements
     RefreshQueuesResponse response =
         recordFactory.newRecordInstance(RefreshQueuesResponse.class);
     try {
-      Configuration conf = getConfiguration(getConfig(),
+      rmContext.getScheduler().reinitialize(getConfig(), this.rmContext);
-          YarnConfiguration.CS_CONFIGURATION_FILE);
-      rmContext.getScheduler().reinitialize(conf, this.rmContext);
       RMAuditLogger.logSuccess(user.getShortUserName(), argName,
           "AdminService");
       return response;
@@ -331,23 +328,27 @@ public class AdminService extends CompositeService implements
   @Override
   public RefreshNodesResponse refreshNodes(RefreshNodesRequest request)
       throws YarnException, StandbyException {
+    String argName = "refreshNodes";
     UserGroupInformation user = checkAcls("refreshNodes");
 
     if (!isRMActive()) {
-      RMAuditLogger.logFailure(user.getShortUserName(), "refreshNodes",
+      RMAuditLogger.logFailure(user.getShortUserName(), argName,
           adminAcl.toString(), "AdminService",
           "ResourceManager is not active. Can not refresh nodes.");
       throwStandbyException();
     }
 
     try {
-      rmContext.getNodesListManager().refreshNodes(new YarnConfiguration());
+      Configuration conf =
-      RMAuditLogger.logSuccess(user.getShortUserName(), "refreshNodes",
+          getConfiguration(new Configuration(false),
+              YarnConfiguration.YARN_SITE_CONFIGURATION_FILE);
+      rmContext.getNodesListManager().refreshNodes(conf);
+      RMAuditLogger.logSuccess(user.getShortUserName(), argName,
           "AdminService");
       return recordFactory.newRecordInstance(RefreshNodesResponse.class);
     } catch (IOException ioe) {
       LOG.info("Exception refreshing nodes ", ioe);
-      RMAuditLogger.logFailure(user.getShortUserName(), "refreshNodes",
+      RMAuditLogger.logFailure(user.getShortUserName(), argName,
           adminAcl.toString(), "AdminService", "Exception refreshing nodes");
       throw RPCUtil.getRemoteException(ioe);
     }
@@ -368,7 +369,7 @@ public class AdminService extends CompositeService implements
     }
 
     Configuration conf =
-        getConfiguration(getConfig(),
+        getConfiguration(new Configuration(false),
             YarnConfiguration.CORE_SITE_CONFIGURATION_FILE);
     ProxyUsers.refreshSuperUserGroupsConfiguration(conf);
     RMAuditLogger.logSuccess(user.getShortUserName(),
@@ -393,7 +394,7 @@ public class AdminService extends CompositeService implements
     }
 
     Groups.getUserToGroupsMappingService(
-        getConfiguration(getConfig(),
+        getConfiguration(new Configuration(false),
             YarnConfiguration.CORE_SITE_CONFIGURATION_FILE)).refresh();
 
     RMAuditLogger.logSuccess(user.getShortUserName(), argName, "AdminService");
@@ -415,7 +416,8 @@ public class AdminService extends CompositeService implements
       throwStandbyException();
     }
     Configuration conf =
-        getConfiguration(getConfig(), YarnConfiguration.YARN_SITE_XML_FILE);
+        getConfiguration(new Configuration(false),
+            YarnConfiguration.YARN_SITE_CONFIGURATION_FILE);
     adminAcl = new AccessControlList(conf.get(
         YarnConfiguration.YARN_ADMIN_ACL,
         YarnConfiguration.DEFAULT_YARN_ADMIN_ACL));
@@ -448,7 +450,7 @@ public class AdminService extends CompositeService implements
 
     PolicyProvider policyProvider = RMPolicyProvider.getInstance();
     Configuration conf =
-        getConfiguration(getConfig(),
+        getConfiguration(new Configuration(false),
             YarnConfiguration.HADOOP_POLICY_CONFIGURATION_FILE);
 
     refreshServiceAcls(conf, policyProvider);
@@ -463,13 +465,8 @@ public class AdminService extends CompositeService implements
 
   private synchronized void refreshServiceAcls(Configuration configuration,
       PolicyProvider policyProvider) {
-    if (this.rmContext.getConfigurationProvider() instanceof
+    this.server.refreshServiceAclWithLoadedConfiguration(configuration,
-        LocalConfigurationProvider) {
+        policyProvider);
-      this.server.refreshServiceAcl(configuration, policyProvider);
-    } else {
-      this.server.refreshServiceAclWithLoadedConfiguration(configuration,
-          policyProvider);
-    }
   }
 
   @Override
@@ -519,8 +516,9 @@ public class AdminService extends CompositeService implements
 
   private synchronized Configuration getConfiguration(Configuration conf,
       String confFileName) throws YarnException, IOException {
-    return this.rmContext.getConfigurationProvider().getConfiguration(conf,
+    conf.addResource(this.rmContext.getConfigurationProvider()
-        confFileName);
+        .getConfigurationInputStream(conf, confFileName));
+    return conf;
   }
 
   @VisibleForTesting

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ApplicationMasterService.java

@@ -39,7 +39,6 @@ import org.apache.hadoop.security.authorize.PolicyProvider;
 import org.apache.hadoop.security.token.TokenIdentifier;
 import org.apache.hadoop.service.AbstractService;
 import org.apache.hadoop.util.StringUtils;
-import org.apache.hadoop.yarn.LocalConfigurationProvider;
 import org.apache.hadoop.yarn.api.ApplicationMasterProtocol;
 import org.apache.hadoop.yarn.api.protocolrecords.AllocateRequest;
 import org.apache.hadoop.yarn.api.protocolrecords.AllocateResponse;
@@ -140,10 +139,10 @@ public class ApplicationMasterService extends AbstractService implements
     if (conf.getBoolean(
         CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHORIZATION, 
         false)) {
-      refreshServiceAcls(
+      conf.addResource(this.rmContext.getConfigurationProvider()
-          this.rmContext.getConfigurationProvider().getConfiguration(conf,
+          .getConfigurationInputStream(conf,
-              YarnConfiguration.HADOOP_POLICY_CONFIGURATION_FILE),
+              YarnConfiguration.HADOOP_POLICY_CONFIGURATION_FILE));
-          RMPolicyProvider.getInstance());
+      refreshServiceAcls(conf, RMPolicyProvider.getInstance());
     }
     
     this.server.start();
@@ -593,13 +592,8 @@ public class ApplicationMasterService extends AbstractService implements
 
   public void refreshServiceAcls(Configuration configuration, 
       PolicyProvider policyProvider) {
-    if (this.rmContext.getConfigurationProvider() instanceof
+    this.server.refreshServiceAclWithLoadedConfiguration(configuration,
-        LocalConfigurationProvider) {
+        policyProvider);
-      this.server.refreshServiceAcl(configuration, policyProvider);
-    } else {
-      this.server.refreshServiceAclWithLoadedConfiguration(configuration,
-          policyProvider);
-    }
   }
   
   @Override

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ClientRMService.java

@@ -43,7 +43,6 @@ import org.apache.hadoop.security.UserGroupInformation.AuthenticationMethod;
 import org.apache.hadoop.security.authorize.PolicyProvider;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.service.AbstractService;
-import org.apache.hadoop.yarn.LocalConfigurationProvider;
 import org.apache.hadoop.yarn.api.ApplicationClientProtocol;
 import org.apache.hadoop.yarn.api.protocolrecords.ApplicationsRequestScope;
 import org.apache.hadoop.yarn.api.protocolrecords.CancelDelegationTokenRequest;
@@ -171,10 +170,10 @@ public class ClientRMService extends AbstractService implements
     if (conf.getBoolean(
         CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHORIZATION, 
         false)) {
-      refreshServiceAcls(
+      conf.addResource(this.rmContext.getConfigurationProvider()
-          this.rmContext.getConfigurationProvider().getConfiguration(conf,
+          .getConfigurationInputStream(conf,
-              YarnConfiguration.HADOOP_POLICY_CONFIGURATION_FILE),
+              YarnConfiguration.HADOOP_POLICY_CONFIGURATION_FILE));
-          RMPolicyProvider.getInstance());
+      refreshServiceAcls(conf, RMPolicyProvider.getInstance());
     }
     
     this.server.start();
@@ -807,13 +806,8 @@ public class ClientRMService extends AbstractService implements
 
   void refreshServiceAcls(Configuration configuration, 
       PolicyProvider policyProvider) {
-    if (this.rmContext.getConfigurationProvider() instanceof
+    this.server.refreshServiceAclWithLoadedConfiguration(configuration,
-        LocalConfigurationProvider) {
+        policyProvider);
-      this.server.refreshServiceAcl(configuration, policyProvider);
-    } else {
-      this.server.refreshServiceAclWithLoadedConfiguration(configuration,
-          policyProvider);
-    }
   }
 
   private boolean isAllowedDelegationTokenOp() throws IOException {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/NodesListManager.java

@@ -32,12 +32,15 @@ import org.apache.hadoop.service.AbstractService;
 import org.apache.hadoop.util.HostsFileReader;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.event.EventHandler;
+import org.apache.hadoop.yarn.exceptions.YarnException;
 import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMApp;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppNodeUpdateEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppNodeUpdateEvent.RMAppNodeUpdateType;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
 
+import com.google.common.annotations.VisibleForTesting;
+
 @SuppressWarnings("unchecked")
 public class NodesListManager extends AbstractService implements
     EventHandler<NodesListManagerEvent> {
@@ -51,6 +54,9 @@ public class NodesListManager extends AbstractService implements
   
   private final RMContext rmContext;
 
+  private String includesFile;
+  private String excludesFile;
+
   public NodesListManager(RMContext rmContext) {
     super(NodesListManager.class.getName());
     this.rmContext = rmContext;
@@ -63,25 +69,17 @@ public class NodesListManager extends AbstractService implements
 
     // Read the hosts/exclude files to restrict access to the RM
     try {
+      this.includesFile = conf.get(YarnConfiguration.RM_NODES_INCLUDE_FILE_PATH,
+          YarnConfiguration.DEFAULT_RM_NODES_INCLUDE_FILE_PATH);
+      this.excludesFile = conf.get(YarnConfiguration.RM_NODES_EXCLUDE_FILE_PATH,
+          YarnConfiguration.DEFAULT_RM_NODES_EXCLUDE_FILE_PATH);
       this.hostsReader =
-        new HostsFileReader(
+          createHostsFileReader(this.includesFile, this.excludesFile);
-            conf.get(YarnConfiguration.RM_NODES_INCLUDE_FILE_PATH, 
-                YarnConfiguration.DEFAULT_RM_NODES_INCLUDE_FILE_PATH),
-            conf.get(YarnConfiguration.RM_NODES_EXCLUDE_FILE_PATH, 
-                YarnConfiguration.DEFAULT_RM_NODES_EXCLUDE_FILE_PATH)
-                );
       printConfiguredHosts();
+    } catch (YarnException ex) {
+      disableHostsFileReader(ex);
     } catch (IOException ioe) {
-      LOG.warn("Failed to init hostsReader, disabling", ioe);
+      disableHostsFileReader(ioe);
-      try {
-        this.hostsReader = 
-          new HostsFileReader(YarnConfiguration.DEFAULT_RM_NODES_INCLUDE_FILE_PATH, 
-              YarnConfiguration.DEFAULT_RM_NODES_EXCLUDE_FILE_PATH);
-      } catch (IOException ioe2) {
-        // Should *never* happen
-        this.hostsReader = null;
-        throw new YarnRuntimeException(ioe2);
-      }
     }
     super.serviceInit(conf);
   }
@@ -103,17 +101,25 @@ public class NodesListManager extends AbstractService implements
     }
   }
 
-  public void refreshNodes(Configuration yarnConf) throws IOException {
+  public void refreshNodes(Configuration yarnConf) throws IOException,
+      YarnException {
     synchronized (hostsReader) {
       if (null == yarnConf) {
         yarnConf = new YarnConfiguration();
       }
-      hostsReader.updateFileNames(yarnConf.get(
+      includesFile =
-          YarnConfiguration.RM_NODES_INCLUDE_FILE_PATH,
+          yarnConf.get(YarnConfiguration.RM_NODES_INCLUDE_FILE_PATH,
-          YarnConfiguration.DEFAULT_RM_NODES_INCLUDE_FILE_PATH), yarnConf.get(
+              YarnConfiguration.DEFAULT_RM_NODES_INCLUDE_FILE_PATH);
-          YarnConfiguration.RM_NODES_EXCLUDE_FILE_PATH,
+      excludesFile =
-          YarnConfiguration.DEFAULT_RM_NODES_EXCLUDE_FILE_PATH));
+          yarnConf.get(YarnConfiguration.RM_NODES_EXCLUDE_FILE_PATH,
-      hostsReader.refresh();
+              YarnConfiguration.DEFAULT_RM_NODES_EXCLUDE_FILE_PATH);
+      hostsReader.updateFileNames(includesFile, excludesFile);
+      hostsReader.refresh(
+          includesFile.isEmpty() ? null : this.rmContext
+              .getConfigurationProvider().getConfigurationInputStream(
+                  this.conf, includesFile), excludesFile.isEmpty() ? null
+              : this.rmContext.getConfigurationProvider()
+                  .getConfigurationInputStream(this.conf, excludesFile));
       printConfiguredHosts();
     }
   }
@@ -174,4 +180,43 @@ public class NodesListManager extends AbstractService implements
       LOG.error("Ignoring invalid eventtype " + event.getType());
     }
   }
+
+  private void disableHostsFileReader(Exception ex) {
+    LOG.warn("Failed to init hostsReader, disabling", ex);
+    try {
+      this.includesFile =
+          conf.get(YarnConfiguration.DEFAULT_RM_NODES_INCLUDE_FILE_PATH);
+      this.excludesFile =
+          conf.get(YarnConfiguration.DEFAULT_RM_NODES_EXCLUDE_FILE_PATH);
+      this.hostsReader =
+          createHostsFileReader(this.includesFile, this.excludesFile);
+    } catch (IOException ioe2) {
+      // Should *never* happen
+      this.hostsReader = null;
+      throw new YarnRuntimeException(ioe2);
+    } catch (YarnException e) {
+      // Should *never* happen
+      this.hostsReader = null;
+      throw new YarnRuntimeException(e);
+    }
+  }
+
+  @VisibleForTesting
+  public HostsFileReader getHostsReader() {
+    return this.hostsReader;
+  }
+
+  private HostsFileReader createHostsFileReader(String includesFile,
+      String excludesFile) throws IOException, YarnException {
+    HostsFileReader hostsReader =
+        new HostsFileReader(includesFile,
+            (includesFile == null || includesFile.isEmpty()) ? null
+                : this.rmContext.getConfigurationProvider()
+                    .getConfigurationInputStream(this.conf, includesFile),
+            excludesFile,
+            (excludesFile == null || excludesFile.isEmpty()) ? null
+                : this.rmContext.getConfigurationProvider()
+                    .getConfigurationInputStream(this.conf, excludesFile));
+    return hostsReader;
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ResourceManager.java

@@ -30,8 +30,6 @@ import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.ha.HAServiceProtocol;
 import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
-import org.apache.hadoop.http.HttpConfig;
-import org.apache.hadoop.http.HttpConfig.Policy;
 import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.metrics2.source.JvmMetrics;
 import org.apache.hadoop.security.Groups;
@@ -44,7 +42,6 @@ import org.apache.hadoop.util.ExitUtil;
 import org.apache.hadoop.util.ReflectionUtils;
 import org.apache.hadoop.util.ShutdownHookManager;
 import org.apache.hadoop.util.StringUtils;
-import org.apache.hadoop.yarn.LocalConfigurationProvider;
 import org.apache.hadoop.yarn.YarnUncaughtExceptionHandler;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
@@ -191,19 +188,18 @@ public class ResourceManager extends CompositeService implements Recoverable {
         ConfigurationProviderFactory.getConfigurationProvider(conf);
     this.configurationProvider.init(this.conf);
     rmContext.setConfigurationProvider(configurationProvider);
-    if (!(this.configurationProvider instanceof LocalConfigurationProvider)) {
+
-      // load yarn-site.xml
+    // load yarn-site.xml
-      this.conf =
+    this.conf.addResource(this.configurationProvider
-          this.configurationProvider.getConfiguration(this.conf,
+        .getConfigurationInputStream(this.conf,
-              YarnConfiguration.YARN_SITE_XML_FILE);
+            YarnConfiguration.YARN_SITE_CONFIGURATION_FILE));
-      // load core-site.xml
+    // load core-site.xml
-      this.conf =
+    this.conf.addResource(this.configurationProvider
-          this.configurationProvider.getConfiguration(this.conf,
+        .getConfigurationInputStream(this.conf,
-              YarnConfiguration.CORE_SITE_CONFIGURATION_FILE);
+            YarnConfiguration.CORE_SITE_CONFIGURATION_FILE));
-      // Do refreshUserToGroupsMappings with loaded core-site.xml
+    // Do refreshUserToGroupsMappings with loaded core-site.xml
-      Groups.getUserToGroupsMappingServiceWithLoadedConfiguration(this.conf)
+    Groups.getUserToGroupsMappingServiceWithLoadedConfiguration(this.conf)
-          .refresh();
+        .refresh();
-    }
 
     // register the handlers for all AlwaysOn services using setupDispatcher().
     rmDispatcher = setupDispatcher();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ResourceTrackerService.java

@@ -29,7 +29,6 @@ import org.apache.hadoop.net.Node;
 import org.apache.hadoop.security.authorize.PolicyProvider;
 import org.apache.hadoop.service.AbstractService;
 import org.apache.hadoop.util.VersionUtil;
-import org.apache.hadoop.yarn.LocalConfigurationProvider;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.api.records.ContainerId;
 import org.apache.hadoop.yarn.api.records.ContainerState;
@@ -164,10 +163,10 @@ public class ResourceTrackerService extends AbstractService implements
     if (conf.getBoolean(
         CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHORIZATION, 
         false)) {
-      refreshServiceAcls(
+      conf.addResource(this.rmContext.getConfigurationProvider()
-          this.rmContext.getConfigurationProvider().getConfiguration(conf,
+          .getConfigurationInputStream(conf,
-              YarnConfiguration.HADOOP_POLICY_CONFIGURATION_FILE),
+              YarnConfiguration.HADOOP_POLICY_CONFIGURATION_FILE));
-          RMPolicyProvider.getInstance());
+      refreshServiceAcls(conf, RMPolicyProvider.getInstance());
     }
 
     this.server.start();
@@ -421,13 +420,8 @@ public class ResourceTrackerService extends AbstractService implements
 
   void refreshServiceAcls(Configuration configuration, 
       PolicyProvider policyProvider) {
-    if (this.rmContext.getConfigurationProvider() instanceof
+    this.server.refreshServiceAclWithLoadedConfiguration(configuration,
-        LocalConfigurationProvider) {
+        policyProvider);
-      this.server.refreshServiceAcl(configuration, policyProvider);
-    } else {
-      this.server.refreshServiceAclWithLoadedConfiguration(configuration,
-          policyProvider);
-    }
   }
 
   @VisibleForTesting

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java

@@ -35,7 +35,6 @@ import org.apache.hadoop.conf.Configurable;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.UserGroupInformation;
-import org.apache.hadoop.yarn.LocalConfigurationProvider;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.ApplicationResourceUsageReport;
@@ -263,19 +262,8 @@ public class CapacityScheduler extends AbstractYarnScheduler
       reinitialize(Configuration conf, RMContext rmContext) throws IOException {
     Configuration configuration = new Configuration(conf);
     if (!initialized) {
-      if (rmContext.getConfigurationProvider() instanceof
+      this.rmContext = rmContext;
-          LocalConfigurationProvider) {
+      this.conf = loadCapacitySchedulerConfiguration(configuration);
-        this.conf = new CapacitySchedulerConfiguration(configuration, true);
-      } else {
-        try {
-          this.conf =
-              new CapacitySchedulerConfiguration(rmContext
-                  .getConfigurationProvider().getConfiguration(configuration,
-                      YarnConfiguration.CS_CONFIGURATION_FILE), false);
-        } catch (Exception e) {
-          throw new IOException(e);
-        }
-      }
       validateConf(this.conf);
       this.minimumAllocation = this.conf.getMinimumAllocation();
       this.maximumAllocation = this.conf.getMaximumAllocation();
@@ -283,7 +271,6 @@ public class CapacityScheduler extends AbstractYarnScheduler
       this.usePortForNodeName = this.conf.getUsePortForNodeName();
       this.applications =
           new ConcurrentHashMap<ApplicationId, SchedulerApplication>();
-      this.rmContext = rmContext;
 
       initializeQueues(this.conf);
       
@@ -294,10 +281,7 @@ public class CapacityScheduler extends AbstractYarnScheduler
           "maximumAllocation=<" + getMaximumResourceCapability() + ">");
     } else {
       CapacitySchedulerConfiguration oldConf = this.conf; 
-      this.conf =
+      this.conf = loadCapacitySchedulerConfiguration(configuration);
-          new CapacitySchedulerConfiguration(conf,
-              rmContext.getConfigurationProvider() instanceof
-                  LocalConfigurationProvider);
       validateConf(this.conf);
       try {
         LOG.info("Re-initializing queues...");
@@ -1042,4 +1026,16 @@ public class CapacityScheduler extends AbstractYarnScheduler
     queue.collectSchedulerApplications(apps);
     return apps;
   }
+
+  private CapacitySchedulerConfiguration loadCapacitySchedulerConfiguration(
+      Configuration configuration) throws IOException {
+    try {
+      configuration.addResource(this.rmContext.getConfigurationProvider()
+          .getConfigurationInputStream(configuration,
+              YarnConfiguration.CS_CONFIGURATION_FILE));
+      return new CapacitySchedulerConfiguration(configuration, false);
+    } catch (Exception e) {
+      throw new IOException(e);
+    }
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRMAdminService.java

@@ -24,8 +24,10 @@ import java.io.DataOutputStream;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
@@ -41,6 +43,7 @@ import org.apache.hadoop.security.authorize.ServiceAuthorizationManager;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.exceptions.YarnException;
 import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshAdminAclsRequest;
+import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshNodesRequest;
 import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshQueuesRequest;
 import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshServiceAclsRequest;
 import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshSuperUserGroupsConfigurationRequest;
@@ -452,6 +455,69 @@ public class TestRMAdminService {
 
   }
 
+  @Test
+  public void testRefreshNodesWithLocalConfigurationProvider() {
+    rm = new MockRM(configuration);
+    rm.init(configuration);
+    rm.start();
+
+    try {
+      rm.adminService.refreshNodes(RefreshNodesRequest.newInstance());
+    } catch (Exception ex) {
+      fail("Using localConfigurationProvider. Should not get any exception.");
+    }
+  }
+
+  @Test
+  public void testRefreshNodesWithFileSystemBasedConfigurationProvider()
+      throws IOException, YarnException {
+    configuration.set(YarnConfiguration.RM_CONFIGURATION_PROVIDER_CLASS,
+        "org.apache.hadoop.yarn.FileSystemBasedConfigurationProvider");
+    try {
+      rm = new MockRM(configuration);
+      rm.init(configuration);
+      rm.start();
+      fail("Should throw an exception");
+    } catch (Exception ex) {
+      // Expect exception here
+    }
+
+    // upload default configurations
+    uploadDefaultConfiguration();
+
+    try {
+      rm = new MockRM(configuration);
+      rm.init(configuration);
+      rm.start();
+    } catch (Exception ex) {
+      fail("Should not get any exceptions");
+    }
+
+    final File excludeHostsFile = new File(tmpDir.toString(), "excludeHosts");
+    if (excludeHostsFile.exists()) {
+      excludeHostsFile.delete();
+    }
+    if (!excludeHostsFile.createNewFile()) {
+      Assert.fail("Can not create " + "excludeHosts");
+    }
+    PrintWriter fileWriter = new PrintWriter(excludeHostsFile);
+    fileWriter.write("0.0.0.0:123");
+    fileWriter.close();
+
+    uploadToRemoteFileSystem(new Path(excludeHostsFile.getAbsolutePath()));
+
+    Configuration yarnConf = new YarnConfiguration();
+    yarnConf.set(YarnConfiguration.RM_NODES_EXCLUDE_FILE_PATH, this.workingPath
+        + "/excludeHosts");
+    uploadConfiguration(yarnConf, YarnConfiguration.YARN_SITE_CONFIGURATION_FILE);
+
+    rm.adminService.refreshNodes(RefreshNodesRequest.newInstance());
+    Set<String> excludeHosts =
+        rm.getNodesListManager().getHostsReader().getExcludedHosts();
+    Assert.assertTrue(excludeHosts.size() == 1);
+    Assert.assertTrue(excludeHosts.contains("0.0.0.0:123"));
+  }
+
   private String writeConfigurationXML(Configuration conf, String confXMLName)
       throws IOException {
     DataOutputStream output = null;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/resources/hadoop-policy.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
+<!--
+  Licensed 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. See accompanying LICENSE file.
+-->
+
+<configuration>
+</configuration>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/resources/yarn-site.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
+<!--
+  Licensed 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. See accompanying LICENSE file.
+-->
+
+<configuration>
+</configuration>