add loadstatus endpoint for serverView status

server/src/main/java/io/druid/client/BrokerServerView.java

@@ -66,6 +66,8 @@ public class BrokerServerView implements TimelineServerView
   private final ServerInventoryView baseView;
   private final TierSelectorStrategy tierSelectorStrategy;
 
+  private volatile boolean initialized = false;
+
   @Inject
   public BrokerServerView(
       QueryToolChestWarehouse warehouse,
@@ -109,6 +111,7 @@ public class BrokerServerView implements TimelineServerView
           @Override
           public CallbackAction segmentViewInitialized()
           {
+            initialized = true;
             return ServerView.CallbackAction.CONTINUE;
           }
         }
@@ -128,6 +131,11 @@ public class BrokerServerView implements TimelineServerView
     );
   }
 
+  public boolean isInitialized()
+  {
+    return initialized;
+  }
+
   public void clear()
   {
     synchronized (lock) {

server/src/main/java/io/druid/server/coordination/BaseZkCoordinator.java

@@ -54,7 +54,7 @@ public abstract class BaseZkCoordinator implements DataSegmentChangeHandler
   private final CuratorFramework curator;
 
   private volatile PathChildrenCache loadQueueCache;
-  private volatile boolean started;
+  private volatile boolean started = false;
   private final ListeningExecutorService loadingExec;
 
   public BaseZkCoordinator(

server/src/main/java/io/druid/server/http/BrokerResource.java

@@ -0,0 +1,50 @@
+/*
+ * Druid - a distributed column store.
+ * Copyright (C) 2014  Metamarkets Group Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package io.druid.server.http;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.inject.Inject;
+import io.druid.client.BrokerServerView;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+
+@Path("/druid/broker/v1")
+public class BrokerResource
+{
+  private final BrokerServerView brokerServerView;
+
+  @Inject
+  public BrokerResource(BrokerServerView brokerServerView)
+  {
+    this.brokerServerView = brokerServerView;
+  }
+
+  @GET
+  @Path("/loadstatus")
+  @Produces(MediaType.APPLICATION_JSON)
+  public Response getLoadStatus()
+  {
+    return Response.ok(ImmutableMap.of("inventoryInitialized", brokerServerView.isInitialized())).build();
+  }
+}

services/src/main/java/io/druid/cli/CliBroker.java

@@ -48,6 +48,7 @@ import io.druid.server.ClientInfoResource;
 import io.druid.server.ClientQuerySegmentWalker;
 import io.druid.server.QueryResource;
 import io.druid.server.coordination.broker.DruidBroker;
+import io.druid.server.http.BrokerResource;
 import io.druid.server.initialization.JettyServerInitializer;
 import io.druid.server.metrics.MetricsModule;
 import io.druid.server.router.TieredBrokerConfig;
@@ -87,6 +88,7 @@ public class CliBroker extends ServerRunnable
             binder.bind(QueryToolChestWarehouse.class).to(MapQueryToolChestWarehouse.class);
 
             binder.bind(CachingClusteredClient.class).in(LazySingleton.class);
+            binder.bind(BrokerServerView.class).in(LazySingleton.class);
             binder.bind(TimelineServerView.class).to(BrokerServerView.class).in(LazySingleton.class);
 
             binder.bind(Cache.class).toProvider(CacheProvider.class).in(ManageLifecycle.class);
@@ -101,6 +103,7 @@ public class CliBroker extends ServerRunnable
 
             binder.bind(JettyServerInitializer.class).to(QueryJettyServerInitializer.class).in(LazySingleton.class);
             Jerseys.addResource(binder, QueryResource.class);
+            Jerseys.addResource(binder, BrokerResource.class);
             Jerseys.addResource(binder, ClientInfoResource.class);
             LifecycleModule.register(binder, QueryResource.class);
             LifecycleModule.register(binder, DruidBroker.class);