diff --git a/server/src/main/java/io/druid/segment/realtime/FireDepartmentMetrics.java b/server/src/main/java/io/druid/segment/realtime/FireDepartmentMetrics.java
index e18034dd679..81b1bc9e316 100644
--- a/server/src/main/java/io/druid/segment/realtime/FireDepartmentMetrics.java
+++ b/server/src/main/java/io/druid/segment/realtime/FireDepartmentMetrics.java
@@ -21,6 +21,8 @@ package io.druid.segment.realtime;
 
 import java.util.concurrent.atomic.AtomicLong;
 
+import com.google.common.base.Preconditions;
+
 /**
  */
 public class FireDepartmentMetrics
@@ -79,4 +81,20 @@ public class FireDepartmentMetrics
     retVal.rowOutputCount.set(rowOutputCount.get());
     return retVal;
   }
+
+  /**
+   * merge other FireDepartmentMetrics, will modify this object's data
+   *
+   * @return this object
+   */
+  public FireDepartmentMetrics merge(FireDepartmentMetrics other)
+  {
+    Preconditions.checkNotNull(other, "Cannot merge a null FireDepartmentMetrics");
+    FireDepartmentMetrics otherSnapshot = other.snapshot();
+    processedCount.addAndGet(otherSnapshot.processed());
+    thrownAwayCount.addAndGet(otherSnapshot.thrownAway());
+    rowOutputCount.addAndGet(otherSnapshot.rowOutput());
+    unparseableCount.addAndGet(otherSnapshot.unparseable());
+    return this;
+  }
 }
diff --git a/server/src/main/java/io/druid/segment/realtime/RealtimeManager.java b/server/src/main/java/io/druid/segment/realtime/RealtimeManager.java
index a1cfb220972..6b06cd7fa3a 100644
--- a/server/src/main/java/io/druid/segment/realtime/RealtimeManager.java
+++ b/server/src/main/java/io/druid/segment/realtime/RealtimeManager.java
@@ -19,6 +19,8 @@
 
 package io.druid.segment.realtime;
 
+import com.fasterxml.jackson.annotation.JacksonInject;
+import com.google.common.base.Function;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Throwables;
 import com.google.common.collect.Iterables;
@@ -29,8 +31,10 @@ import com.metamx.common.lifecycle.LifecycleStart;
 import com.metamx.common.lifecycle.LifecycleStop;
 import com.metamx.common.parsers.ParseException;
 import com.metamx.emitter.EmittingLogger;
+
 import io.druid.data.input.Firehose;
 import io.druid.data.input.InputRow;
+import io.druid.guice.annotations.Processing;
 import io.druid.query.FinalizeResultsQueryRunner;
 import io.druid.query.NoopQueryRunner;
 import io.druid.query.Query;
@@ -43,14 +47,17 @@ import io.druid.query.SegmentDescriptor;
 import io.druid.segment.indexing.DataSchema;
 import io.druid.segment.indexing.RealtimeTuningConfig;
 import io.druid.segment.realtime.plumber.Plumber;
+
 import org.joda.time.DateTime;
 import org.joda.time.Interval;
 import org.joda.time.Period;
 
 import java.io.Closeable;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.ExecutorService;
 
 /**
  */
@@ -60,17 +67,24 @@ public class RealtimeManager implements QuerySegmentWalker
 
   private final List<FireDepartment> fireDepartments;
   private final QueryRunnerFactoryConglomerate conglomerate;
+  private ExecutorService executorService;
+
+  /**
+   * key=data source name,value=FireChiefs of all partition of that data source
+   */
+  private final Map<String, List<FireChief>> chiefs;
 
-  private final Map<String, FireChief> chiefs;
 
   @Inject
   public RealtimeManager(
       List<FireDepartment> fireDepartments,
-      QueryRunnerFactoryConglomerate conglomerate
+      QueryRunnerFactoryConglomerate conglomerate,
+      @JacksonInject @Processing ExecutorService executorService
   )
   {
     this.fireDepartments = fireDepartments;
     this.conglomerate = conglomerate;
+    this.executorService = executorService;
 
     this.chiefs = Maps.newHashMap();
   }
@@ -82,7 +96,12 @@ public class RealtimeManager implements QuerySegmentWalker
       DataSchema schema = fireDepartment.getDataSchema();
 
       final FireChief chief = new FireChief(fireDepartment);
-      chiefs.put(schema.getDataSource(), chief);
+      List<FireChief> chiefs = this.chiefs.get(schema.getDataSource());
+      if (chiefs == null) {
+        chiefs = new ArrayList<RealtimeManager.FireChief>();
+        this.chiefs.put(schema.getDataSource(), chiefs);
+      }
+      chiefs.add(chief);
 
       chief.setName(String.format("chief-%s", schema.getDataSource()));
       chief.setDaemon(true);
@@ -94,34 +113,56 @@ public class RealtimeManager implements QuerySegmentWalker
   @LifecycleStop
   public void stop()
   {
-    for (FireChief chief : chiefs.values()) {
-      CloseQuietly.close(chief);
+    for (Iterable<FireChief> chiefs : this.chiefs.values()) {
+      for (FireChief chief : chiefs) {
+        CloseQuietly.close(chief);
+      }
     }
   }
 
   public FireDepartmentMetrics getMetrics(String datasource)
-  {
-    FireChief chief = chiefs.get(datasource);
-    if (chief == null) {
+	{
+		List<FireChief> chiefs = this.chiefs.get(datasource);
+    if (chiefs == null) {
       return null;
     }
-    return chief.getMetrics();
+    FireDepartmentMetrics snapshot = null;
+    for (FireChief chief : chiefs) {
+      if (snapshot == null) {
+        snapshot = chief.getMetrics().snapshot();
+      } else {
+        snapshot.merge(chief.getMetrics());
+      }
+    }
+    return snapshot;
   }
 
   @Override
-  public <T> QueryRunner<T> getQueryRunnerForIntervals(Query<T> query, Iterable<Interval> intervals)
-  {
-    final FireChief chief = chiefs.get(getDataSourceName(query));
-
-    return chief == null ? new NoopQueryRunner<T>() : chief.getQueryRunner(query);
+  public <T> QueryRunner<T> getQueryRunnerForIntervals(final Query<T> query, Iterable<Interval> intervals)
+	{
+		return getQueryRunnerForSegments(query, null);
   }
 
   @Override
-  public <T> QueryRunner<T> getQueryRunnerForSegments(Query<T> query, Iterable<SegmentDescriptor> specs)
+  public <T> QueryRunner<T> getQueryRunnerForSegments(final Query<T> query, Iterable<SegmentDescriptor> specs)
   {
-    final FireChief chief = chiefs.get(getDataSourceName(query));
-
-    return chief == null ? new NoopQueryRunner<T>() : chief.getQueryRunner(query);
+    QueryRunnerFactory<T, Query<T>> factory = conglomerate.findFactory(query);
+    Iterable<FireChief> chiefsOfDataSource = chiefs.get(getDataSourceName(query));
+    return chiefsOfDataSource == null ? new NoopQueryRunner<T>() : factory.getToolchest().mergeResults(
+        factory.mergeRunners(
+            executorService,
+            Iterables.transform(
+                chiefsOfDataSource, new Function<FireChief, QueryRunner<T>>()
+                {
+                  @Override
+                  public QueryRunner<T> apply(FireChief input)
+                  {
+                    return input.getQueryRunner(query);
+                  }
+                }
+            )
+        )
+    );
   }
 
   private <T> String getDataSourceName(Query<T> query)
diff --git a/server/src/test/java/io/druid/segment/realtime/RealtimeManagerTest.java b/server/src/test/java/io/druid/segment/realtime/RealtimeManagerTest.java
index a2fdeadc9b1..294803beacd 100644
--- a/server/src/test/java/io/druid/segment/realtime/RealtimeManagerTest.java
+++ b/server/src/test/java/io/druid/segment/realtime/RealtimeManagerTest.java
@@ -118,6 +118,7 @@ public class RealtimeManagerTest
                 tuningConfig
             )
         ),
+        null,
         null
     );
   }