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From jia...@apache.org
Subject [28/50] [abbrv] hadoop git commit: YARN-6405. Improve configuring services through REST API. Contributed by Jian He
Date Wed, 21 Jun 2017 18:33:50 GMT
http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/AppState.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/server/appmaster/state/AppState.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/AppState.java
index 43c7ead..9f7b4a8 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/AppState.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/AppState.java
@@ -20,7 +20,13 @@ package org.apache.slider.server.appmaster.state;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import org.apache.commons.io.IOUtils;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.metrics2.lib.MutableGaugeInt;
 import org.apache.hadoop.yarn.api.records.Container;
@@ -42,6 +48,7 @@ import org.apache.slider.api.proto.Messages.ComponentCountProto;
 import org.apache.slider.api.resource.Application;
 import org.apache.slider.api.resource.ApplicationState;
 import org.apache.slider.api.resource.Component;
+import org.apache.slider.api.resource.ConfigFile;
 import org.apache.slider.api.types.ApplicationLivenessInformation;
 import org.apache.slider.api.types.ComponentInformation;
 import org.apache.slider.api.types.RoleStatistics;
@@ -79,6 +86,7 @@ import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.ConcurrentSkipListMap;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import static org.apache.slider.api.ResourceKeys.*;
@@ -99,7 +107,6 @@ public class AppState {
   private final AbstractClusterServices recordFactory;
 
   private final MetricsAndMonitoring metricsAndMonitoring;
-
   /**
    * Flag set to indicate the application is live -this only happens
    * after the buildInstance operation
@@ -108,9 +115,11 @@ public class AppState {
 
   private Application app;
 
+  // priority_id -> RoleStatus
   private final Map<Integer, RoleStatus> roleStatusMap =
     new ConcurrentSkipListMap<>();
 
+  // component_name -> ProviderRole
   private final Map<String, ProviderRole> roles =
     new ConcurrentHashMap<>();
 
@@ -202,6 +211,10 @@ public class AppState {
   private SliderMetrics appMetrics;
 
   private ServiceTimelinePublisher serviceTimelinePublisher;
+
+  // A cache for loading config files from remote such as hdfs
+  public LoadingCache<ConfigFile, Object> configFileCache = null;
+
   /**
    * Create an instance
    * @param recordFactory factory for YARN records
@@ -304,8 +317,6 @@ public class AppState {
   public synchronized void buildInstance(AppStateBindingInfo binding)
       throws BadClusterStateException, BadConfigException, IOException {
     binding.validate();
-
-    log.debug("Building application state");
     containerReleaseSelector = binding.releaseSelector;
 
     // set the cluster specification (once its dependency the client properties
@@ -313,10 +324,8 @@ public class AppState {
     this.app = binding.application;
     appMetrics = SliderMetrics.register(app.getName(),
         "Metrics for service");
-    appMetrics
-        .tag("type", "Metrics type [component or service]", "service");
-    appMetrics
-        .tag("appId", "Application id for service", app.getId());
+    appMetrics.tag("type", "Metrics type [component or service]", "service");
+    appMetrics.tag("appId", "Application id for service", app.getId());
 
     org.apache.slider.api.resource.Configuration conf = app.getConfiguration();
     startTimeThreshold =
@@ -327,12 +336,7 @@ public class AppState {
     nodeFailureThreshold = conf.getPropertyInt(NODE_FAILURE_THRESHOLD,
         DEFAULT_NODE_FAILURE_THRESHOLD);
 
-    //build the initial role list
-    List<ProviderRole> roleList = new ArrayList<>(binding.roles);
-    for (ProviderRole providerRole : roleList) {
-      buildRole(providerRole);
-    }
-
+    //build the initial component list
     int priority = 1;
     for (Component component : app.getComponents()) {
       priority = getNewPriority(priority);
@@ -340,25 +344,18 @@ public class AppState {
       if (roles.containsKey(name)) {
         continue;
       }
-      if (component.getUniqueComponentSupport()) {
-        log.info("Skipping group " + name + ", as it's unique component");
-        continue;
-      }
       log.info("Adding component: " + name);
-      ProviderRole dynamicRole =
-          createComponent(name, name, component, priority);
-      buildRole(dynamicRole);
-      roleList.add(dynamicRole);
+      createComponent(name, name, component, priority++);
     }
+
     //then pick up the requirements
-    buildRoleRequirementsFromResources();
+//    buildRoleRequirementsFromResources();
 
     // set up the role history
     roleHistory = new RoleHistory(roleStatusMap.values(), recordFactory);
     roleHistory.onStart(binding.fs, binding.historyPath);
     // trigger first node update
     roleHistory.onNodesUpdated(binding.nodeReports);
-
     //rebuild any live containers
     rebuildModelFromRestart(binding.liveContainers);
 
@@ -367,9 +364,39 @@ public class AppState {
     //mark as live
     applicationLive = true;
     app.setState(STARTED);
+    createConfigFileCache(binding.fs);
+  }
+
+  private void createConfigFileCache(final FileSystem fileSystem) {
+    this.configFileCache =
+        CacheBuilder.newBuilder().expireAfterAccess(10, TimeUnit.MINUTES)
+            .build(new CacheLoader<ConfigFile, Object>() {
+              @Override public Object load(ConfigFile key) throws Exception {
+                switch (key.getType()) {
+                case HADOOP_XML:
+                  try (FSDataInputStream input = fileSystem
+                      .open(new Path(key.getSrcFile()))) {
+                    org.apache.hadoop.conf.Configuration confRead =
+                        new org.apache.hadoop.conf.Configuration(false);
+                    confRead.addResource(input);
+                    Map<String, String> map = new HashMap<>(confRead.size());
+                    for (Map.Entry<String, String> entry : confRead) {
+                      map.put(entry.getKey(), entry.getValue());
+                    }
+                    return map;
+                  }
+                case TEMPLATE:
+                  try (FSDataInputStream fileInput = fileSystem
+                      .open(new Path(key.getSrcFile()))) {
+                    return IOUtils.toString(fileInput);
+                  }
+                default:
+                  return null;
+                }
+              }
+            });
   }
 
-  //TODO WHY do we need to create the component for AM ?
   public ProviderRole createComponent(String name, String group,
       Component component, int priority) throws BadConfigException {
     org.apache.slider.api.resource.Configuration conf =
@@ -384,26 +411,28 @@ public class AppState {
         DEF_YARN_LABEL_EXPRESSION);
     ProviderRole newRole =
         new ProviderRole(name, group, priority, (int)placementPolicy, threshold,
-            placementTimeout, label, component);
-
+            placementTimeout, label, component, this);
+    buildRole(newRole, component);
     log.info("Created a new role " + newRole);
     return newRole;
   }
 
   @VisibleForTesting
-  public synchronized List<ProviderRole> updateComponents(Map<String, Long>
+  public synchronized void updateComponents(Map<String, Long>
       componentCounts) throws BadConfigException {
     for (Component component : app.getComponents()) {
       if (componentCounts.containsKey(component.getName())) {
-        component.setNumberOfContainers(componentCounts.get(component
-            .getName()));
+        long count = componentCounts.get(component.getName());
+        component.setNumberOfContainers(count);
+        ProviderRole role = roles.get(component.getName());
+        if (role != null && roleStatusMap.get(role.id) != null) {
+          setDesiredContainers(roleStatusMap.get(role.id), (int) count);
+        }
       }
     }
-    //TODO update cluster description
-    return buildRoleRequirementsFromResources();
   }
 
-  public synchronized List<ProviderRole> updateComponents(
+  public synchronized void updateComponents(
       Messages.FlexComponentsRequestProto requestProto)
       throws BadConfigException {
     Map<String, Long> componentCounts = new HashMap<>();
@@ -412,116 +441,119 @@ public class AppState {
       componentCounts.put(componentCount.getName(), componentCount
           .getNumberOfContainers());
     }
-    return updateComponents(componentCounts);
+    updateComponents(componentCounts);
   }
 
   /**
    * build the role requirements from the cluster specification
    * @return a list of any dynamically added provider roles
    */
-  private List<ProviderRole> buildRoleRequirementsFromResources()
-      throws BadConfigException {
-
-    List<ProviderRole> newRoles = new ArrayList<>(0);
-
-    // now update every role's desired count.
-    // if there are no instance values, that role count goes to zero
-    // Add all the existing roles
-    // component name -> number of containers
-    Map<String, Integer> groupCounts = new HashMap<>();
-
-    for (RoleStatus roleStatus : getRoleStatusMap().values()) {
-      if (roleStatus.isExcludeFromFlexing()) {
-        // skip inflexible roles, e.g AM itself
-        continue;
-      }
-      long currentDesired = roleStatus.getDesired();
-      String role = roleStatus.getName();
-      String roleGroup = roleStatus.getGroup();
-      Component component = roleStatus.getProviderRole().component;
-      int desiredInstanceCount = component.getNumberOfContainers().intValue();
-
-      int newDesired = desiredInstanceCount;
-      if (component.getUniqueComponentSupport()) {
-        Integer groupCount = 0;
-        if (groupCounts.containsKey(roleGroup)) {
-          groupCount = groupCounts.get(roleGroup);
-        }
-
-        newDesired = desiredInstanceCount - groupCount;
-
-        if (newDesired > 0) {
-          newDesired = 1;
-          groupCounts.put(roleGroup, groupCount + newDesired);
-        } else {
-          newDesired = 0;
-        }
-      }
-
-      if (newDesired == 0) {
-        log.info("Role {} has 0 instances specified", role);
-      }
-      if (currentDesired != newDesired) {
-        log.info("Role {} flexed from {} to {}", role, currentDesired,
-            newDesired);
-        setDesiredContainers(roleStatus, newDesired);
-      }
-    }
-
-    // now the dynamic ones. Iterate through the the cluster spec and
-    // add any role status entries not in the role status
-
-    for (Component component : app.getComponents()) {
-      String name = component.getName();
-      if (roles.containsKey(name)) {
-        continue;
-      }
-      if (component.getUniqueComponentSupport()) {
-        // THIS NAME IS A GROUP
-        int desiredInstanceCount = component.getNumberOfContainers().intValue();
-        Integer groupCount = 0;
-        if (groupCounts.containsKey(name)) {
-          groupCount = groupCounts.get(name);
-        }
-        for (int i = groupCount + 1; i <= desiredInstanceCount; i++) {
-          // this is a new instance of an existing group
-          String newName = String.format("%s%d", name, i);
-          if (roles.containsKey(newName)) {
-            continue;
-          }
-          int newPriority = getNewPriority(i);
-          log.info("Adding new role {}", newName);
-          ProviderRole dynamicRole =
-              createComponent(newName, name, component, newPriority);
-          RoleStatus newRole = buildRole(dynamicRole);
-          incDesiredContainers(newRole);
-          log.info("New role {}", newRole);
-          if (roleHistory != null) {
-            roleHistory.addNewRole(newRole);
-          }
-          newRoles.add(dynamicRole);
-        }
-      } else {
-        // this is a new value
-        log.info("Adding new role {}, num containers {}", name,
-            component.getNumberOfContainers());
-        ProviderRole dynamicRole =
-            createComponent(name, name, component, getNewPriority(1));
-        RoleStatus newRole = buildRole(dynamicRole);
-        incDesiredContainers(newRole,
-            component.getNumberOfContainers().intValue());
-        log.info("New role {}", newRole);
-        if (roleHistory != null) {
-          roleHistory.addNewRole(newRole);
-        }
-        newRoles.add(dynamicRole);
-      }
-    }
-    // and fill in all those roles with their requirements
-    buildRoleResourceRequirements();
 
-    return newRoles;
-  }
+//  private List<ProviderRole> buildRoleRequirementsFromResources()
+//      throws BadConfigException {
+//
+//    List<ProviderRole> newRoles = new ArrayList<>(0);
+//
+//    // now update every role's desired count.
+//    // if there are no instance values, that role count goes to zero
+//    // Add all the existing roles
+//    // component name -> number of containers
+//    Map<String, Integer> groupCounts = new HashMap<>();
+//
+//    for (RoleStatus roleStatus : getRoleStatusMap().values()) {
+//      if (roleStatus.isExcludeFromFlexing()) {
+//        // skip inflexible roles, e.g AM itself
+//        continue;
+//      }
+//      long currentDesired = roleStatus.getDesired();
+//      String role = roleStatus.getName();
+//      String roleGroup = roleStatus.getGroup();
+//      Component component = roleStatus.getProviderRole().component;
+//      int desiredInstanceCount = component.getNumberOfContainers().intValue();
+//
+//      int newDesired = desiredInstanceCount;
+//      if (component.getUniqueComponentSupport()) {
+//        Integer groupCount = 0;
+//        if (groupCounts.containsKey(roleGroup)) {
+//          groupCount = groupCounts.get(roleGroup);
+//        }
+//
+//        newDesired = desiredInstanceCount - groupCount;
+//
+//        if (newDesired > 0) {
+//          newDesired = 1;
+//          groupCounts.put(roleGroup, groupCount + newDesired);
+//        } else {
+//          newDesired = 0;
+//        }
+//      }
+//
+//      if (newDesired == 0) {
+//        log.info("Role {} has 0 instances specified", role);
+//      }
+//      if (currentDesired != newDesired) {
+//        log.info("Role {} flexed from {} to {}", role, currentDesired,
+//            newDesired);
+//        setDesiredContainers(roleStatus, newDesired);
+//      }
+//    }
+//
+//    log.info("Counts per component: " + groupCounts);
+//    // now the dynamic ones. Iterate through the the cluster spec and
+//    // add any role status entries not in the role status
+//
+//    List<RoleStatus> list = new ArrayList<>(getRoleStatusMap().values());
+//    for (RoleStatus roleStatus : list) {
+//      String name = roleStatus.getName();
+//      Component component = roleStatus.getProviderRole().component;
+//      if (roles.containsKey(name)) {
+//        continue;
+//      }
+//      if (component.getUniqueComponentSupport()) {
+//        // THIS NAME IS A GROUP
+//        int desiredInstanceCount = component.getNumberOfContainers().intValue();
+//        Integer groupCount = 0;
+//        if (groupCounts.containsKey(name)) {
+//          groupCount = groupCounts.get(name);
+//        }
+//        log.info("Component " + component.getName() + ", current count = "
+//            + groupCount + ", desired count = " + desiredInstanceCount);
+//        for (int i = groupCount + 1; i <= desiredInstanceCount; i++) {
+//          int priority = roleStatus.getPriority();
+//          // this is a new instance of an existing group
+//          String newName = String.format("%s%d", name, i);
+//          int newPriority = getNewPriority(priority + i - 1);
+//          log.info("Adding new role {}", newName);
+//          ProviderRole dynamicRole =
+//              createComponent(newName, name, component, newPriority);
+//          RoleStatus newRole = buildRole(dynamicRole);
+//          incDesiredContainers(newRole);
+//          log.info("New role {}", newRole);
+//          if (roleHistory != null) {
+//            roleHistory.addNewRole(newRole);
+//          }
+//          newRoles.add(dynamicRole);
+//        }
+//      } else {
+//        // this is a new value
+//        log.info("Adding new role {}", name);
+//        ProviderRole dynamicRole =
+//            createComponent(name, name, component, roleStatus.getPriority());
+//        RoleStatus newRole = buildRole(dynamicRole);
+//        incDesiredContainers(roleStatus,
+//            component.getNumberOfContainers().intValue());
+//        log.info("New role {}", newRole);
+//        if (roleHistory != null) {
+//          roleHistory.addNewRole(newRole);
+//        }
+//        newRoles.add(dynamicRole);
+//      }
+//    }
+//    // and fill in all those roles with their requirements
+//    buildRoleResourceRequirements();
+//
+//    return newRoles;
+//  }
 
   private int getNewPriority(int start) {
     if (!rolePriorityMap.containsKey(start)) {
@@ -539,16 +571,20 @@ public class AppState {
    * @return the role status built up
    * @throws BadConfigException if a role of that priority already exists
    */
-  public RoleStatus buildRole(ProviderRole providerRole) throws BadConfigException {
+  public RoleStatus buildRole(ProviderRole providerRole, Component component)
+      throws BadConfigException {
     // build role status map
     int priority = providerRole.id;
     if (roleStatusMap.containsKey(priority)) {
-      throw new BadConfigException("Duplicate Provider Key: %s and %s",
-                                   providerRole,
-                                   roleStatusMap.get(priority)
-                                       .getProviderRole());
+      throw new BadConfigException("Duplicate component priority Key: %s and %s",
+          providerRole, roleStatusMap.get(priority));
     }
     RoleStatus roleStatus = new RoleStatus(providerRole);
+    roleStatus.setResourceRequirements(buildResourceRequirements(roleStatus));
+    long prev = roleStatus.getDesired();
+    setDesiredContainers(roleStatus, component.getNumberOfContainers().intValue());
+    log.info("Set desired containers for component " + component.getName() +
+        " from " + prev + " to " + roleStatus.getDesired());
     roleStatusMap.put(priority, roleStatus);
     String name = providerRole.name;
     roles.put(name, providerRole);
@@ -559,16 +595,6 @@ public class AppState {
   }
 
   /**
-   * Build up the requirements of every resource
-   */
-  private void buildRoleResourceRequirements() {
-    for (RoleStatus role : roleStatusMap.values()) {
-      role.setResourceRequirements(buildResourceRequirements(role));
-      log.info("Setting resource requirements for {} to {}", role.getName(),
-          role.getResourceRequirements());
-    }
-  }
-  /**
    * Look up the status entry of a role or raise an exception
    * @param key role ID
    * @return the status entry
@@ -731,7 +757,7 @@ public class AppState {
   }
 
   /**
-   * Enum all nodes by role. 
+   * Enum all nodes by role.
    * @param role role, or "" for all roles
    * @return a list of nodes, may be empty
    */
@@ -785,7 +811,7 @@ public class AppState {
   }
 
   /**
-   * Build a map of role->nodename->node-info
+   * Build a map of Component_name -> ContainerId -> ClusterNode
    * 
    * @return the map of Role name to list of Cluster Nodes
    */
@@ -850,7 +876,7 @@ public class AppState {
 
   /**
    * Create a container request.
-   * Update internal state, such as the role request count. 
+   * Update internal state, such as the role request count.
    * Anti-Affine: the {@link RoleStatus#outstandingAArequest} is set here.
    * This is where role history information will be used for placement decisions.
    * @param role role
@@ -942,18 +968,9 @@ public class AppState {
   }
 
   private void setDesiredContainers(RoleStatus role, int n) {
+    int delta = n - role.getComponentMetrics().containersDesired.value();
     role.getComponentMetrics().containersDesired.set(n);
-    appMetrics.containersDesired.set(n);
-  }
-
-  private void incDesiredContainers(RoleStatus role) {
-    role.getComponentMetrics().containersDesired.incr();
-    appMetrics.containersDesired.incr();
-  }
-
-  private void incDesiredContainers(RoleStatus role, int n) {
-    role.getComponentMetrics().containersDesired.incr(n);
-    appMetrics.containersDesired.incr(n);
+    appMetrics.containersDesired.incr(delta);
   }
 
   private void incCompletedContainers(RoleStatus role) {
@@ -1001,7 +1018,8 @@ public class AppState {
    * Build up the resource requirements for this role from the cluster
    * specification, including substituting max allowed values if the
    * specification asked for it (except when
-   * {@link ResourceKeys#YARN_RESOURCE_NORMALIZATION_ENABLED} is set to false).
+   * {@link org.apache.slider.api.ResourceKeys#YARN_RESOURCE_NORMALIZATION_ENABLED}
+   * is set to false).
    * @param role role
    * during normalization
    */
@@ -1009,11 +1027,6 @@ public class AppState {
     // Set up resource requirements from role values
     String name = role.getName();
     Component component = role.getProviderRole().component;
-    if (component == null) {
-      // this is for AM container
-      // TODO why do we need to create the component for AM ?
-      return Resource.newInstance(1, 512);
-    }
     int cores = DEF_YARN_CORES;
     if (component.getResource() != null && component.getResource().getCpus()
         != null) {
@@ -1282,10 +1295,13 @@ public class AppState {
       if (roleInstance != null) {
         int roleId = roleInstance.roleId;
         String rolename = roleInstance.role;
-        log.info("Failed container in role[{}] : {}", roleId, rolename);
+        log.info("Failed container in role[{}] : {}", roleId,
+            roleInstance.getCompInstanceName());
         try {
           RoleStatus roleStatus = lookupRoleStatus(roleInstance.roleId);
           decRunningContainers(roleStatus);
+          roleStatus.getProviderRole().failedInstanceName
+              .offer(roleInstance.compInstanceName);
           boolean shortLived = isShortLived(roleInstance);
           String message;
           Container failedContainer = roleInstance.container;
@@ -1571,7 +1587,7 @@ public class AppState {
 
   /**
    * Look at the allocation status of one role, and trigger add/release
-   * actions if the number of desired role instances doesn't equal 
+   * actions if the number of desired role instances doesn't equal
    * (actual + pending).
    * <p>
    * MUST be executed from within a synchronized method
@@ -1584,7 +1600,6 @@ public class AppState {
   @SuppressWarnings("SynchronizationOnLocalVariableOrMethodParameter")
   private List<AbstractRMOperation> reviewOneRole(RoleStatus role)
       throws SliderInternalStateException, TriggerClusterTeardownException {
-    log.info("review one role " + role.getName());
     List<AbstractRMOperation> operations = new ArrayList<>();
     long delta;
     long expected;
@@ -1594,9 +1609,7 @@ public class AppState {
       expected = role.getDesired();
     }
 
-    log.info("Reviewing {} : ", role);
-    log.debug("Expected {}, Requested/Running {}, Delta: {}", expected,
-        role.getActualAndRequested(), delta);
+    log.info("Reviewing " + role.getName() + ": " + role.getComponentMetrics());
     checkFailureThreshold(role);
 
     if (expected < 0 ) {
@@ -1729,7 +1742,9 @@ public class AppState {
         for (RoleInstance possible : finalCandidates) {
           log.info("Targeting for release: {}", possible);
           containerReleaseSubmitted(possible.container);
-          operations.add(new ContainerReleaseOperation(possible.getId()));
+          role.getProviderRole().failedInstanceName
+              .offer(possible.compInstanceName);
+          operations.add(new ContainerReleaseOperation(possible.getContainerId()));
         }
       }
 
@@ -1783,7 +1798,7 @@ public class AppState {
     for (RoleInstance role : activeRoleInstances) {
       if (role.container.getId().equals(containerId)) {
         containerReleaseSubmitted(role.container);
-        operations.add(new ContainerReleaseOperation(role.getId()));
+        operations.add(new ContainerReleaseOperation(role.getContainerId()));
       }
     }
 
@@ -1907,17 +1922,6 @@ public class AppState {
   }
 
   /**
-   * Get diagnostics info about containers
-   */
-  public String getContainerDiagnosticInfo() {
-    StringBuilder builder = new StringBuilder();
-    for (RoleStatus roleStatus : getRoleStatusMap().values()) {
-      builder.append(roleStatus).append('\n');
-    }
-    return builder.toString();
-  }
-
-  /**
    * Event handler for the list of active containers on restart.
    * Sets the info key {@link StatusKeys#INFO_CONTAINERS_AM_RESTART}
    * to the size of the list passed down (and does not set it if none were)
@@ -1965,10 +1969,10 @@ public class AppState {
 
     //update app state internal structures and maps
 
+    //TODO recover the component instance name from zk registry ?
     RoleInstance instance = new RoleInstance(container);
     instance.command = roleName;
     instance.role = roleName;
-    instance.group = role.getGroup();
     instance.roleId = roleId;
     instance.environment = new String[0];
     instance.container = container;

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/RoleInstance.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/server/appmaster/state/RoleInstance.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/RoleInstance.java
index de52f4e..736dfd1 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/RoleInstance.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/RoleInstance.java
@@ -19,6 +19,7 @@
 package org.apache.slider.server.appmaster.state;
 
 import com.google.common.base.Preconditions;
+import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.registry.client.binding.RegistryTypeUtils;
 import org.apache.hadoop.registry.client.types.Endpoint;
 import org.apache.hadoop.registry.client.types.ProtocolTypes;
@@ -27,6 +28,7 @@ import org.apache.hadoop.yarn.api.records.ContainerId;
 import org.apache.hadoop.yarn.api.records.NodeId;
 import org.apache.slider.api.ClusterNode;
 import org.apache.slider.api.proto.Messages;
+import org.apache.slider.api.resource.ConfigFile;
 import org.apache.slider.api.types.ContainerInformation;
 import org.apache.slider.common.tools.SliderUtils;
 import org.apache.slider.providers.ProviderRole;
@@ -42,6 +44,8 @@ public final class RoleInstance implements Cloneable {
 
   public Container container;
   public ProviderRole providerRole;
+  public long componentId = -1;
+  public String compInstanceName = null;
   /**
    * Container ID
    */
@@ -58,7 +62,6 @@ public final class RoleInstance implements Cloneable {
    * Name of the role
    */
   public String role;
-  public String group;
 
   /**
    * Version of the app
@@ -106,7 +109,7 @@ public final class RoleInstance implements Cloneable {
   public String host;
   public String hostURL;
   public ContainerAllocationOutcome placement;
-
+  public Path compInstanceDir;
 
   /**
    * A list of registered endpoints.
@@ -114,10 +117,24 @@ public final class RoleInstance implements Cloneable {
   private List<Endpoint> endpoints =
       new ArrayList<>(2);
 
-  public RoleInstance(ContainerAssignment assignment) {
-    this(assignment.container);
-    placement = assignment.placement;
+  public RoleInstance(Container container, ProviderRole role) {
+    this(container);
+    if (role.componentIdCounter != null) {
+      componentId = role.componentIdCounter.getAndIncrement();
+      compInstanceName = role.name + componentId;
+    } else {
+      compInstanceName = role.name;
+    }
+    this.providerRole = role;
+  }
+
+  public RoleInstance(Container container, ProviderRole role,
+      String compInstanceName) {
+    this(container);
+    this.compInstanceName = compInstanceName;
+    this.providerRole = role;
   }
+
   /**
    * Create an instance to track an allocated container
    * @param container a container which must be non null, and have a non-null Id field.
@@ -136,10 +153,6 @@ public final class RoleInstance implements Cloneable {
       hostURL = "http://" + container.getNodeHttpAddress();
     }
   }
-
-  public ContainerId getId() {
-    return container.getId();
-  }
   
   public NodeId getHost() {
     return container.getNodeId();
@@ -151,6 +164,7 @@ public final class RoleInstance implements Cloneable {
       new StringBuilder("RoleInstance{");
     sb.append("role='").append(role).append('\'');
     sb.append(", id='").append(id).append('\'');
+    sb.append(", instanceName='").append(compInstanceName).append('\'');
     sb.append(", container=").append(SliderUtils.containerToString(container));
     sb.append(", createTime=").append(createTime);
     sb.append(", startTime=").append(startTime);
@@ -170,7 +184,7 @@ public final class RoleInstance implements Cloneable {
   }
 
   public ContainerId getContainerId() {
-    return container != null ? container.getId() : null;
+    return container.getId();
   }
 
   /**
@@ -322,4 +336,8 @@ public final class RoleInstance implements Cloneable {
     }
     return info;
   }
+
+  public String getCompInstanceName() {
+    return compInstanceName;
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/RoleStatus.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/server/appmaster/state/RoleStatus.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/RoleStatus.java
index 5051aee..9842481 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/RoleStatus.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/RoleStatus.java
@@ -272,6 +272,7 @@ public final class RoleStatus implements MetricSet {
       // containers -- maybe we need releasing
       //if we are releasing, remove the number that are already released.
       //but never switch to a positive
+      // TODO, WHY is this min operation even needed ??? if delta is negative, it's always < 0 ???
       delta = Math.min(delta, 0);
     }
     return delta;

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/StateAccessForProviders.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/server/appmaster/state/StateAccessForProviders.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/StateAccessForProviders.java
index 118ca9d..5bc6dce 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/StateAccessForProviders.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/server/appmaster/state/StateAccessForProviders.java
@@ -214,6 +214,7 @@ public interface StateAccessForProviders {
 
   /**
    * Find out about the nodes for specific roles
+   * Component_name -> ContainerId -> ClusterNode
    * @return 
    */
   Map<String, Map<String, ClusterNode>> getRoleClusterNodeMapping();

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/util/RestApiErrorMessages.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/util/RestApiErrorMessages.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/util/RestApiErrorMessages.java
index 0f6247d..ac89ed8 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/util/RestApiErrorMessages.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/util/RestApiErrorMessages.java
@@ -59,7 +59,7 @@ public interface RestApiErrorMessages {
       ERROR_RESOURCE_CPUS_INVALID_RANGE
           + " for component %s (or at the global level)";
   String ERROR_CONTAINERS_COUNT_INVALID =
-      "Required no of containers not specified";
+      "Invalid no of containers specified";
   String ERROR_CONTAINERS_COUNT_FOR_COMP_INVALID =
       ERROR_CONTAINERS_COUNT_INVALID + ERROR_SUFFIX_FOR_COMPONENT;
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/util/ServiceApiUtil.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/util/ServiceApiUtil.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/util/ServiceApiUtil.java
index 776ce00..d7c72a3 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/util/ServiceApiUtil.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/util/ServiceApiUtil.java
@@ -20,17 +20,30 @@ package org.apache.slider.util;
 
 import com.google.common.annotations.VisibleForTesting;
 import org.apache.commons.lang.StringUtils;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
 import org.apache.slider.api.resource.Application;
 import org.apache.slider.api.resource.Artifact;
 import org.apache.slider.api.resource.Component;
+import org.apache.slider.api.resource.ConfigFile;
 import org.apache.slider.api.resource.Configuration;
 import org.apache.slider.api.resource.Resource;
 import org.apache.slider.common.tools.SliderUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
-public class ServiceApiUtil {
+import java.io.IOException;
+import java.nio.file.Paths;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
 
+public class ServiceApiUtil {
+  private static final Logger log =
+      LoggerFactory.getLogger(ServiceApiUtil.class);
   @VisibleForTesting
-  public static void validateApplicationPostPayload(Application application) {
+  public static void validateApplicationPayload(Application application,
+      FileSystem fs) throws IOException {
     if (StringUtils.isEmpty(application.getName())) {
       throw new IllegalArgumentException(
           RestApiErrorMessages.ERROR_APPLICATION_NAME_INVALID);
@@ -64,11 +77,13 @@ public class ServiceApiUtil {
           application.getArtifact().getType());
 
       // container size
-      if (application.getNumberOfContainers() == null) {
+      if (application.getNumberOfContainers() == null
+          || application.getNumberOfContainers() < 0) {
         throw new IllegalArgumentException(
-            RestApiErrorMessages.ERROR_CONTAINERS_COUNT_INVALID);
+            RestApiErrorMessages.ERROR_CONTAINERS_COUNT_INVALID + ": "
+                + application.getNumberOfContainers());
       }
-
+      validateConfigFile(application.getConfiguration().getFiles(), fs);
       // Since it is a simple app with no components, create a default component
       application.getComponents().add(createDefaultComponent(application));
     } else {
@@ -114,11 +129,13 @@ public class ServiceApiUtil {
         if (comp.getNumberOfContainers() == null) {
           comp.setNumberOfContainers(globalNumberOfContainers);
         }
-        if (comp.getNumberOfContainers() == null) {
+        if (comp.getNumberOfContainers() == null
+            || comp.getNumberOfContainers() < 0) {
           throw new IllegalArgumentException(String.format(
-              RestApiErrorMessages.ERROR_CONTAINERS_COUNT_FOR_COMP_INVALID,
-              comp.getName()));
+              RestApiErrorMessages.ERROR_CONTAINERS_COUNT_FOR_COMP_INVALID
+                  + ": " + comp.getNumberOfContainers(), comp.getName()));
         }
+        validateConfigFile(comp.getConfiguration().getFiles(), fs);
       }
     }
 
@@ -128,6 +145,46 @@ public class ServiceApiUtil {
     }
   }
 
+  // 1) Verify the src_file exists and non-empty for template
+  // 2) dest_file is absolute path
+  private static void validateConfigFile(List<ConfigFile> list, FileSystem fs)
+      throws IOException {
+    Set<String> destFileSet = new HashSet<>();
+
+    for (ConfigFile file : list) {
+      if (file.getType().equals(ConfigFile.TypeEnum.TEMPLATE) && StringUtils
+          .isEmpty(file.getSrcFile())) {
+        throw new IllegalArgumentException(
+            "Src_file is empty for " + ConfigFile.TypeEnum.TEMPLATE);
+
+      }
+      if (!StringUtils.isEmpty(file.getSrcFile())) {
+        Path p = new Path(file.getSrcFile());
+        if (!fs.exists(p)) {
+          throw new IllegalArgumentException(
+              "Src_file does not exist for config file: " + file
+                  .getSrcFile());
+        }
+      }
+
+      if (StringUtils.isEmpty(file.getDestFile())) {
+        throw new IllegalArgumentException("Dest_file is empty.");
+      }
+      // validate dest_file is absolute
+      if (!Paths.get(file.getDestFile()).isAbsolute()) {
+        throw new IllegalArgumentException(
+            "Dest_file must be absolute path: " + file.getDestFile());
+      }
+
+      if (destFileSet.contains(file.getDestFile())) {
+        throw new IllegalArgumentException(
+            "Duplicated ConfigFile exists: " + file.getDestFile());
+      }
+      destFileSet.add(file.getDestFile());
+    }
+  }
+
+
   private static void validateApplicationResource(Resource resource,
       Component comp, Artifact.TypeEnum artifactType) {
     // Only apps/components of type APPLICATION can skip resource requirement
@@ -200,4 +257,8 @@ public class ServiceApiUtil {
     comp.setLaunchCommand(app.getLaunchCommand());
     return comp;
   }
+
+  public static String $(String s) {
+    return "${" + s +"}";
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateDynamicHistory.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateDynamicHistory.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateDynamicHistory.java
index da2ed0d..9e79821 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateDynamicHistory.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateDynamicHistory.java
@@ -67,7 +67,7 @@ public class TestMockAppStateDynamicHistory extends BaseMockAppStateTest
     return new MockYarnEngine(8, 1);
   }
 
-  @Test
+  // TODO does not support adding new components dynamically
   public void testDynamicRoleHistory() throws Throwable {
 
     String dynamic = "dynamicRole";
@@ -81,12 +81,8 @@ public class TestMockAppStateDynamicHistory extends BaseMockAppStateTest
         .COMPONENT_PLACEMENT_POLICY, "" + placementPolicy);
     application.getComponents().add(component);
 
-    // write the definitions
-    List<ProviderRole> updates = appState.updateComponents(
+    appState.updateComponents(
         Collections.singletonMap(dynamic, desired));
-    assertEquals(1, updates.size());
-    ProviderRole updatedRole = updates.get(0);
-    assertEquals(updatedRole.placementPolicy, placementPolicy);
 
     // now look at the role map
     assertNotNull(appState.getRoleMap().get(dynamic));

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateFlexDynamicRoles.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateFlexDynamicRoles.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateFlexDynamicRoles.java
index 01bf9bd..6d8e963 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateFlexDynamicRoles.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateFlexDynamicRoles.java
@@ -87,7 +87,7 @@ public class TestMockAppStateFlexDynamicRoles extends BaseMockAppStateTest
     createAndStartNodes();
   }
 
-  @Test
+  // TODO does not support adding new components dynamically
   public void testDynamicFlexAddRole() throws Throwable {
     Application application = appState.getClusterStatus();
     Component component = new Component().name("dynamicAdd7")
@@ -96,16 +96,12 @@ public class TestMockAppStateFlexDynamicRoles extends BaseMockAppStateTest
     appState.updateComponents(Collections.singletonMap(component.getName(),
         component.getNumberOfContainers()));
     createAndStartNodes();
-    dumpClusterDescription("updated CD", appState.getClusterStatus());
     appState.lookupRoleStatus("dynamicAdd7");
   }
 
   @Test
   public void testDynamicFlexDropRole() throws Throwable {
     appState.updateComponents(Collections.singletonMap("dynamic-6", 0L));
-
-    Application getCD = appState.getClusterStatus();
-    dumpClusterDescription("updated CD", getCD);
     //status is retained for future
     appState.lookupRoleStatus("dynamic-6");
   }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateUniqueNames.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateUniqueNames.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateUniqueNames.java
index eaf5271..54ffe17 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateUniqueNames.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockAppStateUniqueNames.java
@@ -26,10 +26,15 @@ import org.apache.slider.server.appmaster.model.mock.MockRoles;
 import org.apache.slider.server.appmaster.model.mock.MockYarnEngine;
 import org.apache.slider.server.appmaster.state.AppStateBindingInfo;
 import org.apache.slider.server.appmaster.state.MostRecentContainerReleaseSelector;
+import org.apache.slider.server.appmaster.state.RoleInstance;
 import org.apache.slider.server.appmaster.state.RoleStatus;
 import org.junit.Test;
 
 import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.TreeMap;
 
 /**
  * Test that if you have more than one role, the right roles are chosen for
@@ -72,40 +77,76 @@ public class TestMockAppStateUniqueNames extends BaseMockAppStateTest
     return application;
   }
 
+  public static Map<String, RoleInstance> organize(List<RoleInstance>
+      instances) {
+    Map<String, RoleInstance> map = new TreeMap<>();
+    for (RoleInstance instance : instances) {
+      assertFalse("Multiple role instances for unique name " + instance
+              .compInstanceName, map.containsKey(instance.compInstanceName));
+      System.out.println("Adding to map " + instance.compInstanceName + " for" +
+          instance.role);
+      map.put(instance.compInstanceName, instance);
+    }
+    return map;
+  }
+
+  public static void verifyInstances(List<RoleInstance> instances, String
+      group, String... roles) {
+    assertEquals(roles.length, instances.size());
+    Map<String, RoleInstance> map = organize(instances);
+    int i = 0;
+    for (Entry<String, RoleInstance> entry : map.entrySet()) {
+      assertEquals(roles[i], entry.getKey());
+      RoleInstance instance = entry.getValue();
+      assertEquals(roles[i], instance.compInstanceName);
+      assertEquals(group, instance.role);
+      assertEquals(group, instance.providerRole.name);
+      assertEquals(group, instance.providerRole.group);
+      // TODO remove group from provider role if it continues to be unused
+      i++;
+    }
+  }
+
   @Test
   public void testDynamicFlexDown() throws Throwable {
     createAndStartNodes();
+    List<RoleInstance> instances = appState.cloneOwnedContainerList();
+    verifyInstances(instances, "group1", "group10", "group11");
+
     appState.updateComponents(Collections.singletonMap("group1", 0L));
     createAndStartNodes();
-    RoleStatus roleStatus = appState.lookupRoleStatus("group11");
+    instances = appState.cloneOwnedContainerList();
+    assertEquals(0, instances.size());
+
+    RoleStatus roleStatus = appState.lookupRoleStatus("group1");
     assertEquals(0, roleStatus.getDesired());
     assertEquals(1024L, roleStatus.getResourceRequirements().getMemorySize());
     assertEquals(2, roleStatus.getResourceRequirements().getVirtualCores());
     assertEquals("group1", roleStatus.getGroup());
+
+    // now flex back up
+    appState.updateComponents(Collections.singletonMap("group1", 3L));
+    createAndStartNodes();
+    instances = appState.cloneOwnedContainerList();
+    verifyInstances(instances, "group1", "group10", "group11", "group12");
+    // fails because the names continue at N+1, with group12, group13, group14
   }
 
   @Test
   public void testDynamicFlexUp() throws Throwable {
     createAndStartNodes();
+    List<RoleInstance> instances = appState.cloneOwnedContainerList();
+    verifyInstances(instances, "group1", "group10", "group11");
+
     appState.updateComponents(Collections.singletonMap("group1", 3L));
     createAndStartNodes();
-    RoleStatus group11 = appState.lookupRoleStatus("group11");
-    RoleStatus group12 = appState.lookupRoleStatus("group12");
-    RoleStatus group13 = appState.lookupRoleStatus("group13");
-    assertEquals(1, group11.getDesired());
-    assertEquals(1, group12.getDesired());
-    assertEquals(1, group13.getDesired());
-    assertEquals(1024L, group11.getResourceRequirements().getMemorySize());
-    assertEquals(1024L, group12.getResourceRequirements().getMemorySize());
-    assertEquals(1024L, group13.getResourceRequirements().getMemorySize());
-    assertEquals(2, group11.getResourceRequirements().getVirtualCores());
-    assertEquals(2, group12.getResourceRequirements().getVirtualCores());
-    assertEquals(2, group13.getResourceRequirements().getVirtualCores());
-    assertEquals("group1", group11.getGroup());
-    assertEquals("group1", group12.getGroup());
-    assertEquals("group1", group13.getGroup());
-
-    appState.refreshClusterStatus();
+    instances = appState.cloneOwnedContainerList();
+    verifyInstances(instances, "group1", "group10", "group11", "group12");
+
+    RoleStatus group1 = appState.lookupRoleStatus("group1");
+    assertEquals(3, group1.getDesired());
+    assertEquals(1024L, group1.getResourceRequirements().getMemorySize());
+    assertEquals("group1", group1.getGroup());
   }
 
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockContainerResourceAllocations.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockContainerResourceAllocations.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockContainerResourceAllocations.java
index 046bd83..d382c8a 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockContainerResourceAllocations.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/appstate/TestMockContainerResourceAllocations.java
@@ -27,6 +27,7 @@ import org.apache.slider.server.appmaster.model.mock.MockAppState;
 import org.apache.slider.server.appmaster.model.mock.MockRoles;
 import org.apache.slider.server.appmaster.operations.AbstractRMOperation;
 import org.apache.slider.server.appmaster.operations.ContainerRequestOperation;
+import org.apache.slider.server.appmaster.state.RoleStatus;
 import org.junit.Test;
 
 import java.util.Collections;
@@ -47,6 +48,11 @@ public class TestMockContainerResourceAllocations extends BaseMockAppStateTest {
     Component role0 = appState.getClusterStatus().getComponent(MockRoles.ROLE0);
     role0.resource(new org.apache.slider.api.resource.Resource().memory("512")
         .cpus(2));
+    // hack - because role0 is created before the test run
+    RoleStatus role0Status =
+        appState.getRoleStatusMap().get(appState.getRoleMap().get(ROLE0).id);
+    role0Status.setResourceRequirements(
+        appState.buildResourceRequirements(role0Status));
     appState.updateComponents(Collections.singletonMap(role0.getName(),
         role0.getNumberOfContainers()));
     List<AbstractRMOperation> ops = appState.reviewRequestAndReleaseNodes();
@@ -58,12 +64,17 @@ public class TestMockContainerResourceAllocations extends BaseMockAppStateTest {
     assertEquals(2, requirements.getVirtualCores());
   }
 
+  //TODO replace with resource profile feature in yarn
   @Test
   public void testMaxMemAllocations() throws Throwable {
     // max core allocations no longer supported
     Component role0 = appState.getClusterStatus().getComponent(MockRoles.ROLE0);
     role0.resource(new org.apache.slider.api.resource.Resource()
         .memory(ResourceKeys.YARN_RESOURCE_MAX).cpus(2));
+    RoleStatus role0Status =
+        appState.getRoleStatusMap().get(appState.getRoleMap().get(ROLE0).id);
+    role0Status.setResourceRequirements(
+        appState.buildResourceRequirements(role0Status));
     appState.updateComponents(Collections.singletonMap(role0.getName(),
         role0.getNumberOfContainers()));
     List<AbstractRMOperation> ops = appState.reviewRequestAndReleaseNodes();

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/mock/BaseMockAppStateTest.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/mock/BaseMockAppStateTest.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/mock/BaseMockAppStateTest.java
index eca8401..4352959 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/mock/BaseMockAppStateTest.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/mock/BaseMockAppStateTest.java
@@ -176,7 +176,14 @@ public abstract class BaseMockAppStateTest extends SliderTestBase implements
    */
   public RoleInstance roleInstance(ContainerAssignment assigned) {
     Container target = assigned.container;
-    RoleInstance ri = new RoleInstance(target);
+    String failedInstance =
+        assigned.role.getProviderRole().failedInstanceName.poll();
+    RoleInstance ri;
+    if (failedInstance != null) {
+      ri = new RoleInstance(target,  assigned.role.getProviderRole(), failedInstance);
+    } else {
+      ri = new RoleInstance(target, assigned.role.getProviderRole());
+    }
     ri.roleId = assigned.role.getPriority();
     ri.role = assigned.role.getName();
     return ri;

http://git-wip-us.apache.org/repos/asf/hadoop/blob/6a8ef5f8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/mock/MockProviderService.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/mock/MockProviderService.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/mock/MockProviderService.java
index 112a5ac..4098cf7 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/mock/MockProviderService.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/test/java/org/apache/slider/server/appmaster/model/mock/MockProviderService.java
@@ -30,6 +30,7 @@ import org.apache.slider.core.exceptions.SliderException;
 import org.apache.slider.core.launch.ContainerLauncher;
 import org.apache.slider.providers.ProviderRole;
 import org.apache.slider.providers.ProviderService;
+import org.apache.slider.server.appmaster.state.RoleInstance;
 import org.apache.slider.server.appmaster.state.StateAccessForProviders;
 import org.apache.slider.server.services.yarnregistry.YarnRegistryViewForProviders;
 
@@ -118,7 +119,8 @@ public class MockProviderService implements ProviderService {
   @Override
   public void buildContainerLaunchContext(ContainerLauncher containerLauncher,
       Application application, Container container, ProviderRole providerRole,
-      SliderFileSystem sliderFileSystem) throws IOException, SliderException {
+      SliderFileSystem sliderFileSystem, RoleInstance roleInstance)
+      throws IOException, SliderException {
 
   }
 


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