diff --git a/client/pom.xml b/client/pom.xml
index 511531ac6be..5b44a907c1c 100644
--- a/client/pom.xml
+++ b/client/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/client/src/main/java/com/metamx/druid/client/DruidServer.java b/client/src/main/java/com/metamx/druid/client/DruidServer.java
index a71d8a15ac7..ff565e04fce 100644
--- a/client/src/main/java/com/metamx/druid/client/DruidServer.java
+++ b/client/src/main/java/com/metamx/druid/client/DruidServer.java
@@ -24,8 +24,6 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.google.common.collect.ImmutableMap;
 import com.metamx.common.logger.Logger;
 
-
-
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
@@ -41,7 +39,7 @@ public class DruidServer implements Comparable
 
   private final String name;
   private final ConcurrentMap<String, DruidDataSource> dataSources;
-  private final Map<String, DataSegment> segments;
+  private final ConcurrentMap<String, DataSegment> segments;
 
   private final String host;
   private final long maxSize;
@@ -80,7 +78,7 @@ public class DruidServer implements Comparable
     this.tier = tier;
 
     this.dataSources = new ConcurrentHashMap<String, DruidDataSource>();
-    this.segments = new HashMap<String, DataSegment>();
+    this.segments = new ConcurrentHashMap<String, DataSegment>();
   }
 
   public String getName()
@@ -132,7 +130,7 @@ public class DruidServer implements Comparable
   @JsonProperty
   public Map<String, DataSegment> getSegments()
   {
-    return segments;
+    return ImmutableMap.copyOf(segments);
   }
 
   public DataSegment getSegment(String segmentName)
diff --git a/client/src/main/java/com/metamx/druid/query/ChainedExecutionQueryRunner.java b/client/src/main/java/com/metamx/druid/query/ChainedExecutionQueryRunner.java
index 6a30a743892..52fc99a35b1 100644
--- a/client/src/main/java/com/metamx/druid/query/ChainedExecutionQueryRunner.java
+++ b/client/src/main/java/com/metamx/druid/query/ChainedExecutionQueryRunner.java
@@ -20,6 +20,7 @@
 package com.metamx.druid.query;
 
 import com.google.common.base.Function;
+import com.google.common.base.Throwables;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Ordering;
@@ -27,6 +28,7 @@ import com.metamx.common.guava.BaseSequence;
 import com.metamx.common.guava.MergeIterable;
 import com.metamx.common.guava.Sequence;
 import com.metamx.common.guava.Sequences;
+import com.metamx.common.logger.Logger;
 import com.metamx.druid.Query;
 
 import java.util.Arrays;
@@ -52,6 +54,8 @@ import java.util.concurrent.Future;
  */
 public class ChainedExecutionQueryRunner<T> implements QueryRunner<T>
 {
+  private static final Logger log = new Logger(ChainedExecutionQueryRunner.class);
+
   private final Iterable<QueryRunner<T>> queryables;
   private final ExecutorService exec;
   private final Ordering<T> ordering;
@@ -100,7 +104,13 @@ public class ChainedExecutionQueryRunner<T> implements QueryRunner<T>
                               @Override
                               public List<T> call() throws Exception
                               {
-                                return Sequences.toList(input.run(query), Lists.<T>newArrayList());
+                                try {
+                                  return Sequences.toList(input.run(query), Lists.<T>newArrayList());
+                                }
+                                catch (Exception e) {
+                                  log.error(e, "Exception with one of the sequences!");
+                                  throw Throwables.propagate(e);
+                                }
                               }
                             }
                         );
diff --git a/client/src/main/java/com/metamx/druid/query/group/GroupByQueryQueryToolChest.java b/client/src/main/java/com/metamx/druid/query/group/GroupByQueryQueryToolChest.java
index 51570e30955..a2a68ecc1cf 100644
--- a/client/src/main/java/com/metamx/druid/query/group/GroupByQueryQueryToolChest.java
+++ b/client/src/main/java/com/metamx/druid/query/group/GroupByQueryQueryToolChest.java
@@ -37,7 +37,6 @@ import com.metamx.druid.initialization.Initialization;
 import com.metamx.druid.input.MapBasedRow;
 import com.metamx.druid.input.Row;
 import com.metamx.druid.input.Rows;
-import com.metamx.druid.query.CacheStrategy;
 import com.metamx.druid.query.MetricManipulationFn;
 import com.metamx.druid.query.QueryRunner;
 import com.metamx.druid.query.QueryToolChest;
@@ -78,7 +77,13 @@ public class GroupByQueryQueryToolChest extends QueryToolChest<Row, GroupByQuery
       {
         final GroupByQuery query = (GroupByQuery) input;
 
-        List<Interval> condensed = query.getIntervals();
+        final QueryGranularity gran = query.getGranularity();
+        final long timeStart = query.getIntervals().get(0).getStartMillis();
+
+        // use gran.iterable instead of gran.truncate so that
+        // AllGranularity returns timeStart instead of Long.MIN_VALUE
+        final long granTimeStart = gran.iterable(timeStart, timeStart+1).iterator().next();
+
         final List<AggregatorFactory> aggs = Lists.transform(
             query.getAggregatorSpecs(),
             new Function<AggregatorFactory, AggregatorFactory>()
@@ -102,10 +107,11 @@ public class GroupByQueryQueryToolChest extends QueryToolChest<Row, GroupByQuery
             }
         );
 
-        final QueryGranularity gran = query.getGranularity();
         final IncrementalIndex index = runner.run(query).accumulate(
             new IncrementalIndex(
-                gran.truncate(condensed.get(0).getStartMillis()),
+                // use granularity truncated min timestamp
+                // since incoming truncated timestamps may precede timeStart
+                granTimeStart,
                 gran,
                 aggs.toArray(new AggregatorFactory[aggs.size()])
             ),
@@ -128,13 +134,11 @@ public class GroupByQueryQueryToolChest extends QueryToolChest<Row, GroupByQuery
             Sequences.simple(index.iterableWithPostAggregations(query.getPostAggregatorSpecs())),
             new Function<Row, Row>()
             {
-              private final QueryGranularity granularity = query.getGranularity();
-
               @Override
               public Row apply(Row input)
               {
                 final MapBasedRow row = (MapBasedRow) input;
-                return new MapBasedRow(granularity.toDateTime(row.getTimestampFromEpoch()), row.getEvent());
+                return new MapBasedRow(gran.toDateTime(row.getTimestampFromEpoch()), row.getEvent());
               }
             }
         );
diff --git a/common/pom.xml b/common/pom.xml
index 8d4868eeca7..67857c543f6 100644
--- a/common/pom.xml
+++ b/common/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/common/src/main/java/com/metamx/druid/aggregation/Aggregator.java b/common/src/main/java/com/metamx/druid/aggregation/Aggregator.java
index 4acbd162f5a..fd42549971e 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/Aggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/Aggregator.java
@@ -19,8 +19,6 @@
 
 package com.metamx.druid.aggregation;
 
-import java.util.Comparator;
-
 /**
  * An Aggregator is an object that can aggregate metrics.  Its aggregation-related methods (namely, aggregate() and get())
  * do not take any arguments as the assumption is that the Aggregator was given something in its constructor that
@@ -40,4 +38,5 @@ public interface Aggregator {
   Object get();
   float getFloat();
   String getName();
+  void close();
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/BufferAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/BufferAggregator.java
index bff68cd14a2..6a010f7a3db 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/BufferAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/BufferAggregator.java
@@ -88,4 +88,9 @@ public interface BufferAggregator
    * @return the float representation of the aggregate
    */
   float getFloat(ByteBuffer buf, int position);
+
+  /**
+   * Release any resources used by the aggregator
+   */
+  void close();
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/CountAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/CountAggregator.java
index ec656a25673..e806aa78e1c 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/CountAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/CountAggregator.java
@@ -75,4 +75,10 @@ public class CountAggregator implements Aggregator
   {
     return new CountAggregator(name);
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/CountBufferAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/CountBufferAggregator.java
index c2a6b5a485d..0e6f06c786f 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/CountBufferAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/CountBufferAggregator.java
@@ -49,4 +49,10 @@ public class CountBufferAggregator implements BufferAggregator
   {
     return buf.getLong(position);
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/DoubleSumAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/DoubleSumAggregator.java
index 21cb4691227..545c8c64feb 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/DoubleSumAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/DoubleSumAggregator.java
@@ -89,4 +89,10 @@ public class DoubleSumAggregator implements Aggregator
   {
     return new DoubleSumAggregator(name, selector);
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/DoubleSumBufferAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/DoubleSumBufferAggregator.java
index 3e85d489db2..62f4e75f553 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/DoubleSumBufferAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/DoubleSumBufferAggregator.java
@@ -59,4 +59,10 @@ public class DoubleSumBufferAggregator implements BufferAggregator
   {
     return (float) buf.getDouble(position);
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/HistogramAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/HistogramAggregator.java
index c2d9d674732..2355f458d29 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/HistogramAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/HistogramAggregator.java
@@ -80,4 +80,10 @@ public class HistogramAggregator implements Aggregator
   {
     return name;
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/HistogramBufferAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/HistogramBufferAggregator.java
index fe4f366631c..07c7c37dee0 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/HistogramBufferAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/HistogramBufferAggregator.java
@@ -90,4 +90,10 @@ public class HistogramBufferAggregator implements BufferAggregator
   {
     throw new UnsupportedOperationException("HistogramBufferAggregator does not support getFloat()");
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/JavaScriptAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/JavaScriptAggregator.java
index 80daa045d82..d24277660bf 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/JavaScriptAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/JavaScriptAggregator.java
@@ -21,6 +21,7 @@ package com.metamx.druid.aggregation;
 
 import com.google.common.collect.Lists;
 import com.metamx.druid.processing.FloatMetricSelector;
+import org.mozilla.javascript.Context;
 
 import java.util.List;
 
@@ -33,6 +34,8 @@ public class JavaScriptAggregator implements Aggregator
     public double combine(double a, double b);
 
     public double reset();
+
+    public void close();
   }
 
   private final String name;
@@ -79,4 +82,10 @@ public class JavaScriptAggregator implements Aggregator
   {
     return name;
   }
+
+  @Override
+  public void close()
+  {
+    script.close();
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/JavaScriptAggregatorFactory.java b/common/src/main/java/com/metamx/druid/aggregation/JavaScriptAggregatorFactory.java
index 5c257f8cc74..58f1e8d1e3d 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/JavaScriptAggregatorFactory.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/JavaScriptAggregatorFactory.java
@@ -30,6 +30,8 @@ import com.metamx.druid.processing.MetricSelectorFactory;
 
 
 import org.mozilla.javascript.Context;
+import org.mozilla.javascript.ContextAction;
+import org.mozilla.javascript.ContextFactory;
 import org.mozilla.javascript.Function;
 import org.mozilla.javascript.Script;
 import org.mozilla.javascript.ScriptableObject;
@@ -49,7 +51,7 @@ public class JavaScriptAggregatorFactory implements AggregatorFactory
   private final List<String> fieldNames;
   private final String script;
 
-  private final JavaScriptAggregator.ScriptAggregator combiner;
+  private final JavaScriptAggregator.ScriptAggregator compiledScript;
 
   @JsonCreator
   public JavaScriptAggregatorFactory(
@@ -61,7 +63,7 @@ public class JavaScriptAggregatorFactory implements AggregatorFactory
     this.name = name;
     this.script = expression;
     this.fieldNames = fieldNames;
-    this.combiner = compileScript(script);
+    this.compiledScript = compileScript(script);
   }
 
   @Override
@@ -77,7 +79,7 @@ public class JavaScriptAggregatorFactory implements AggregatorFactory
               public FloatMetricSelector apply(@Nullable String s) { return metricFactory.makeFloatMetricSelector(s); }
             }
         ),
-        compileScript(script)
+        compiledScript
     );
   }
 
@@ -96,7 +98,7 @@ public class JavaScriptAggregatorFactory implements AggregatorFactory
               }
             }
         ),
-        compileScript(script)
+        compiledScript
     );
   }
 
@@ -109,7 +111,7 @@ public class JavaScriptAggregatorFactory implements AggregatorFactory
   @Override
   public Object combine(Object lhs, Object rhs)
   {
-    return combiner.combine(((Number) lhs).doubleValue(), ((Number) rhs).doubleValue());
+    return compiledScript.combine(((Number) lhs).doubleValue(), ((Number) rhs).doubleValue());
   }
 
   @Override
@@ -187,7 +189,7 @@ public class JavaScriptAggregatorFactory implements AggregatorFactory
   @Override
   public Object getAggregatorStartValue()
   {
-    return combiner.reset();
+    return compiledScript.reset();
   }
 
   @Override
@@ -212,22 +214,29 @@ public class JavaScriptAggregatorFactory implements AggregatorFactory
 
   public static JavaScriptAggregator.ScriptAggregator compileScript(final String script)
   {
-    final Context cx = Context.enter();
-    cx.setOptimizationLevel(9);
-    final ScriptableObject scope = cx.initStandardObjects();
+    final ContextFactory contextFactory = ContextFactory.getGlobal();
+    Context context = contextFactory.enterContext();
+    context.setOptimizationLevel(9);
 
-    Script compiledScript = cx.compileString(script, "script", 1, null);
-    compiledScript.exec(cx, scope);
+    final ScriptableObject scope = context.initStandardObjects();
+
+    Script compiledScript = context.compileString(script, "script", 1, null);
+    compiledScript.exec(context, scope);
 
     final Function fnAggregate = getScriptFunction("aggregate", scope);
     final Function fnReset = getScriptFunction("reset", scope);
     final Function fnCombine = getScriptFunction("combine", scope);
+    Context.exit();
+
 
     return new JavaScriptAggregator.ScriptAggregator()
     {
       @Override
-      public double aggregate(double current, FloatMetricSelector[] selectorList)
+      public double aggregate(final double current, final FloatMetricSelector[] selectorList)
       {
+        Context cx = Context.getCurrentContext();
+        if(cx == null) cx = contextFactory.enterContext();
+
         final int size = selectorList.length;
         final Object[] args = new Object[size + 1];
 
@@ -237,29 +246,47 @@ public class JavaScriptAggregatorFactory implements AggregatorFactory
           args[i + 1] = selectorList[i++].get();
         }
 
-        Object res = fnAggregate.call(cx, scope, scope, args);
+        final Object res = fnAggregate.call(cx, scope, scope, args);
         return Context.toNumber(res);
       }
 
       @Override
-      public double combine(double a, double b)
+      public double combine(final double a, final double b)
       {
-        Object res = fnCombine.call(cx, scope, scope, new Object[]{a, b});
+        final Object res = contextFactory.call(
+            new ContextAction()
+            {
+              @Override
+              public Object run(final Context cx)
+              {
+                return fnCombine.call(cx, scope, scope, new Object[]{a, b});
+              }
+            }
+        );
         return Context.toNumber(res);
       }
 
       @Override
       public double reset()
       {
-        Object res = fnReset.call(cx, scope, scope, new Object[]{});
+        final Object res = contextFactory.call(
+            new ContextAction()
+            {
+              @Override
+              public Object run(final Context cx)
+              {
+                return fnReset.call(cx, scope, scope, new Object[]{});
+              }
+            }
+        );
         return Context.toNumber(res);
       }
 
       @Override
-      protected void finalize() throws Throwable
-      {
-        cx.exit();
-        super.finalize();
+      public void close() {
+        if(Context.getCurrentContext() != null) {
+          Context.exit();
+        }
       }
     };
   }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/JavaScriptBufferAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/JavaScriptBufferAggregator.java
index 02fe27abda4..88f97b6a5dd 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/JavaScriptBufferAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/JavaScriptBufferAggregator.java
@@ -62,4 +62,9 @@ public class JavaScriptBufferAggregator implements BufferAggregator
   {
     return (float)buf.getDouble(position);
   }
+
+  @Override
+  public void close() {
+    script.close();
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/LongSumAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/LongSumAggregator.java
index 32a81ef719f..9c7aadfa4f1 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/LongSumAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/LongSumAggregator.java
@@ -89,4 +89,10 @@ public class LongSumAggregator implements Aggregator
   {
     return new LongSumAggregator(name, selector);
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/LongSumBufferAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/LongSumBufferAggregator.java
index 533f6782d5d..747d383fcb7 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/LongSumBufferAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/LongSumBufferAggregator.java
@@ -59,4 +59,10 @@ public class LongSumBufferAggregator implements BufferAggregator
   {
     return (float) buf.getLong(position);
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/MaxAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/MaxAggregator.java
index 0bd0ed6f29a..8761c001da4 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/MaxAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/MaxAggregator.java
@@ -82,4 +82,10 @@ public class MaxAggregator implements Aggregator
   {
     return new MaxAggregator(name, selector);
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/MaxBufferAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/MaxBufferAggregator.java
index 8a497a1ddfb..4bfcd2f2bbf 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/MaxBufferAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/MaxBufferAggregator.java
@@ -57,4 +57,10 @@ public class MaxBufferAggregator implements BufferAggregator
   {
     return (float) buf.getDouble(position);
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/MinAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/MinAggregator.java
index 1ff56fa837d..a42ba758ed0 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/MinAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/MinAggregator.java
@@ -82,4 +82,10 @@ public class MinAggregator implements Aggregator
   {
     return new MinAggregator(name, selector);
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/MinBufferAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/MinBufferAggregator.java
index 68e34675e36..7bd29477b97 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/MinBufferAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/MinBufferAggregator.java
@@ -57,4 +57,10 @@ public class MinBufferAggregator implements BufferAggregator
   {
     return (float) buf.getDouble(position);
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/NoopAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/NoopAggregator.java
index 11e175d7b78..5f7ddb2e78b 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/NoopAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/NoopAggregator.java
@@ -59,4 +59,10 @@ public class NoopAggregator implements Aggregator
   {
     return name;
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/aggregation/NoopBufferAggregator.java b/common/src/main/java/com/metamx/druid/aggregation/NoopBufferAggregator.java
index c46eb6a8d16..a486fbcad2e 100644
--- a/common/src/main/java/com/metamx/druid/aggregation/NoopBufferAggregator.java
+++ b/common/src/main/java/com/metamx/druid/aggregation/NoopBufferAggregator.java
@@ -46,4 +46,10 @@ public class NoopBufferAggregator implements BufferAggregator
   {
     return 0;
   }
+
+  @Override
+  public void close()
+  {
+    // no resources to cleanup
+  }
 }
diff --git a/common/src/main/java/com/metamx/druid/processing/MetricSelectorUtils.java b/common/src/main/java/com/metamx/druid/processing/MetricSelectorUtils.java
new file mode 100644
index 00000000000..0db847b70d9
--- /dev/null
+++ b/common/src/main/java/com/metamx/druid/processing/MetricSelectorUtils.java
@@ -0,0 +1,5 @@
+package com.metamx.druid.processing;
+
+public class MetricSelectorUtils
+{
+}
diff --git a/druid-services/pom.xml b/druid-services/pom.xml
index 9cdfd73c66b..9a90a88481d 100644
--- a/druid-services/pom.xml
+++ b/druid-services/pom.xml
@@ -24,11 +24,11 @@
     <artifactId>druid-services</artifactId>
     <name>druid-services</name>
     <description>druid-services</description>
-    <version>0.3.27-SNAPSHOT</version>
+    <version>0.3.28-SNAPSHOT</version>
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/examples/pom.xml b/examples/pom.xml
index 37d52dd4310..106c6e04c30 100644
--- a/examples/pom.xml
+++ b/examples/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <modules>
diff --git a/examples/rand/pom.xml b/examples/rand/pom.xml
index d2c09b3238c..33537a83c28 100644
--- a/examples/rand/pom.xml
+++ b/examples/rand/pom.xml
@@ -9,7 +9,7 @@
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid-examples</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/examples/twitter/pom.xml b/examples/twitter/pom.xml
index 666cc6b4e39..674309f7a9c 100644
--- a/examples/twitter/pom.xml
+++ b/examples/twitter/pom.xml
@@ -9,7 +9,7 @@
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid-examples</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/index-common/pom.xml b/index-common/pom.xml
index bea2c9305b6..42d4a29b0c4 100644
--- a/index-common/pom.xml
+++ b/index-common/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/indexer/pom.xml b/indexer/pom.xml
index a22c0f8a175..db6a1b2e3a6 100644
--- a/indexer/pom.xml
+++ b/indexer/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/merger/pom.xml b/merger/pom.xml
index ec6f64e76dd..48a4ffab96b 100644
--- a/merger/pom.xml
+++ b/merger/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/merger/src/main/java/com/metamx/druid/merger/worker/WorkerTaskMonitor.java b/merger/src/main/java/com/metamx/druid/merger/worker/WorkerTaskMonitor.java
index 400abec76fe..02e95a0ef39 100644
--- a/merger/src/main/java/com/metamx/druid/merger/worker/WorkerTaskMonitor.java
+++ b/merger/src/main/java/com/metamx/druid/merger/worker/WorkerTaskMonitor.java
@@ -175,7 +175,7 @@ public class WorkerTaskMonitor implements QuerySegmentWalker
   private boolean isTaskRunning(final Task task)
   {
     for (final Task runningTask : running) {
-      if (runningTask.equals(task.getId())) {
+      if (runningTask.getId().equals(task.getId())) {
         return true;
       }
     }
diff --git a/pom.xml b/pom.xml
index d35e832394a..2fd37a68160 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
     <groupId>com.metamx</groupId>
     <artifactId>druid</artifactId>
     <packaging>pom</packaging>
-    <version>0.3.27-SNAPSHOT</version>
+    <version>0.3.28-SNAPSHOT</version>
     <name>druid</name>
     <description>druid</description>
     <scm>
diff --git a/realtime/pom.xml b/realtime/pom.xml
index e8cdc73e6f0..e8ac06907af 100644
--- a/realtime/pom.xml
+++ b/realtime/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <properties>
diff --git a/server/pom.xml b/server/pom.xml
index eb7c8ee42b5..caecb6b70cb 100644
--- a/server/pom.xml
+++ b/server/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>com.metamx</groupId>
         <artifactId>druid</artifactId>
-        <version>0.3.27-SNAPSHOT</version>
+        <version>0.3.28-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/server/src/main/java/com/metamx/druid/master/DruidMasterLogger.java b/server/src/main/java/com/metamx/druid/master/DruidMasterLogger.java
index 38068600637..1328619db44 100644
--- a/server/src/main/java/com/metamx/druid/master/DruidMasterLogger.java
+++ b/server/src/main/java/com/metamx/druid/master/DruidMasterLogger.java
@@ -19,6 +19,7 @@
 
 package com.metamx.druid.master;
 
+import com.google.common.collect.Maps;
 import com.google.common.collect.MinMaxPriorityQueue;
 import com.metamx.common.logger.Logger;
 import com.metamx.druid.client.DataSegment;
@@ -28,6 +29,7 @@ import com.metamx.druid.collect.CountingMap;
 import com.metamx.emitter.service.ServiceEmitter;
 import com.metamx.emitter.service.ServiceMetricEvent;
 
+import javax.annotation.Nullable;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicLong;
@@ -38,6 +40,21 @@ public class DruidMasterLogger implements DruidMasterHelper
 {
   private static final Logger log = new Logger(DruidMasterLogger.class);
 
+  private <T extends Number> void emitTieredStats(final ServiceEmitter emitter, final String formatString, final Map<String, T> statMap)
+  {
+  if (statMap != null) {
+      for (Map.Entry<String, T> entry : statMap.entrySet()) {
+        String tier = entry.getKey();
+        Number value = entry.getValue();
+        emitter.emit(
+            new ServiceMetricEvent.Builder().build(
+                    String.format(formatString, tier), value.doubleValue()
+                )
+        );
+      }
+    }
+  }
+
   @Override
   public DruidMasterRuntimeParams run(DruidMasterRuntimeParams params)
   {
@@ -65,35 +82,30 @@ public class DruidMasterLogger implements DruidMasterHelper
       }
     }
 
-    emitter.emit(
-        new ServiceMetricEvent.Builder().build(
-            "master/cost/raw", stats.getGlobalStats().get("initialCost")
-        )
-    );
+    emitTieredStats(emitter, "master/%s/cost/raw",
+                    stats.getPerTierStats().get("initialCost"));
 
-    emitter.emit(
-        new ServiceMetricEvent.Builder().build(
-            "master/cost/normalization", stats.getGlobalStats().get("normalization")
-        )
-    );
+    emitTieredStats(emitter, "master/%s/cost/normalization",
+                    stats.getPerTierStats().get("normalization"));
 
-    emitter.emit(
-        new ServiceMetricEvent.Builder().build(
-            "master/cost/normalized", stats.getGlobalStats().get("normalizedInitialCostTimesOneThousand").doubleValue() / 1000d
-        )
-    );
+    emitTieredStats(emitter, "master/%s/moved/count",
+                    stats.getPerTierStats().get("movedCount"));
 
-    emitter.emit(
-        new ServiceMetricEvent.Builder().build(
-            "master/moved/count", stats.getGlobalStats().get("movedCount")
-        )
-    );
+    emitTieredStats(emitter, "master/%s/deleted/count",
+                    stats.getPerTierStats().get("deletedCount"));
 
-    emitter.emit(
-        new ServiceMetricEvent.Builder().build(
-            "master/deleted/count", stats.getGlobalStats().get("deletedCount")
-        )
-    );
+    emitTieredStats(emitter, "master/%s/cost/normalized",
+                    Maps.transformEntries(stats.getPerTierStats().get("normalizedInitialCostTimesOneThousand"),
+                                          new Maps.EntryTransformer<String, AtomicLong, Number>()
+                                          {
+                                            @Override
+                                            public Number transformEntry(
+                                                @Nullable String key, @Nullable AtomicLong value
+                                            )
+                                            {
+                                              return value.doubleValue() / 1000d;
+                                            }
+                                          }));
 
     Map<String, AtomicLong> unneeded = stats.getPerTierStats().get("unneededCount");
     if (unneeded != null) {
diff --git a/server/src/main/java/com/metamx/druid/query/group/GroupByQueryEngine.java b/server/src/main/java/com/metamx/druid/query/group/GroupByQueryEngine.java
index cb9a1468b80..a944bfef894 100644
--- a/server/src/main/java/com/metamx/druid/query/group/GroupByQueryEngine.java
+++ b/server/src/main/java/com/metamx/druid/query/group/GroupByQueryEngine.java
@@ -31,6 +31,8 @@ import com.metamx.common.ISE;
 import com.metamx.common.guava.BaseSequence;
 import com.metamx.common.guava.FunctionalIterator;
 import com.metamx.common.guava.Sequence;
+import com.metamx.common.guava.Sequences;
+import com.metamx.common.parsers.CloseableIterator;
 import com.metamx.druid.StorageAdapter;
 import com.metamx.druid.aggregation.AggregatorFactory;
 import com.metamx.druid.aggregation.BufferAggregator;
@@ -47,6 +49,7 @@ import org.joda.time.DateTime;
 import org.joda.time.Interval;
 
 import javax.annotation.Nullable;
+import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.Iterator;
 import java.util.List;
@@ -85,33 +88,47 @@ public class GroupByQueryEngine
 
     final ResourceHolder<ByteBuffer> bufferHolder = intermediateResultsBufferPool.take();
 
-    return new BaseSequence<Row, Iterator<Row>>(
-        new BaseSequence.IteratorMaker<Row, Iterator<Row>>()
+    return Sequences.concat(
+        new BaseSequence<Sequence<Row>, Iterator<Sequence<Row>>>(new BaseSequence.IteratorMaker<Sequence<Row>, Iterator<Sequence<Row>>>()
         {
           @Override
-          public Iterator<Row> make()
+          public Iterator<Sequence<Row>> make()
           {
             return FunctionalIterator
-                .create(cursors.iterator())
-                .transformCat(
-                    new Function<Cursor, Iterator<Row>>()
-                    {
-                      @Override
-                      public Iterator<Row> apply(@Nullable final Cursor cursor)
-                      {
-                        return new RowIterator(query, cursor, bufferHolder.get());
-                      }
-                    }
-                );
+              .create(cursors.iterator())
+              .transform(new Function<Cursor, Sequence<Row>>()
+                        {
+                          @Override
+                          public Sequence<Row> apply(@Nullable final Cursor cursor)
+                          {
+                            return new BaseSequence<Row, CloseableIterator<Row>>(
+                                new BaseSequence.IteratorMaker<Row, CloseableIterator<Row>>()
+                                {
+                                  @Override
+                                  public  CloseableIterator<Row> make()
+                                  {
+                                    return new RowIterator(query, cursor, bufferHolder.get());
+                                  }
+
+                                  @Override
+                                  public void cleanup(CloseableIterator iterFromMake)
+                                  {
+                                    Closeables.closeQuietly(iterFromMake);
+                                  }
+                                }
+                            );
+                          }
+              });
           }
 
           @Override
-          public void cleanup(Iterator<Row> iterFromMake)
+          public void cleanup(Iterator<Sequence<Row>> iterFromMake)
           {
             Closeables.closeQuietly(bufferHolder);
           }
-        }
+        })
     );
+
   }
 
   private static class RowUpdater
@@ -248,7 +265,7 @@ public class GroupByQueryEngine
     }
   }
 
-  private class RowIterator implements Iterator<Row>
+  private class RowIterator implements CloseableIterator<Row>
   {
     private final GroupByQuery query;
     private final Cursor cursor;
@@ -384,5 +401,12 @@ public class GroupByQueryEngine
     {
       throw new UnsupportedOperationException();
     }
+
+    public void close() {
+      // cleanup
+      for(BufferAggregator agg : aggregators) {
+        agg.close();
+      }
+    }
   }
 }
diff --git a/server/src/main/java/com/metamx/druid/query/timeseries/TimeseriesQueryEngine.java b/server/src/main/java/com/metamx/druid/query/timeseries/TimeseriesQueryEngine.java
index 018dc329fc2..24a3816d2de 100644
--- a/server/src/main/java/com/metamx/druid/query/timeseries/TimeseriesQueryEngine.java
+++ b/server/src/main/java/com/metamx/druid/query/timeseries/TimeseriesQueryEngine.java
@@ -80,7 +80,14 @@ public class TimeseriesQueryEngine
                       bob.addMetric(postAgg);
                     }
 
-                    return bob.build();
+                    Result<TimeseriesResultValue> retVal = bob.build();
+
+                    // cleanup
+                    for(Aggregator agg : aggregators) {
+                      agg.close();
+                    }
+
+                    return retVal;
                   }
                 }
             ).iterator();
diff --git a/server/src/test/java/com/metamx/druid/query/group/GroupByQueryRunnerTest.java b/server/src/test/java/com/metamx/druid/query/group/GroupByQueryRunnerTest.java
index 6e86c9e1022..5dd95c9c4e0 100644
--- a/server/src/test/java/com/metamx/druid/query/group/GroupByQueryRunnerTest.java
+++ b/server/src/test/java/com/metamx/druid/query/group/GroupByQueryRunnerTest.java
@@ -30,6 +30,7 @@ import com.metamx.common.guava.Sequence;
 import com.metamx.common.guava.Sequences;
 import com.metamx.druid.PeriodGranularity;
 import com.metamx.druid.Query;
+import com.metamx.druid.QueryGranularity;
 import com.metamx.druid.TestHelper;
 import com.metamx.druid.aggregation.AggregatorFactory;
 import com.metamx.druid.aggregation.LongSumAggregatorFactory;
@@ -232,6 +233,7 @@ public class GroupByQueryRunnerTest
         .setGranularity(new PeriodGranularity(new Period("P1M"), null, null));
 
     final GroupByQuery fullQuery = builder.build();
+    final GroupByQuery allGranQuery = builder.copy().setGranularity(QueryGranularity.ALL).build();
 
     QueryRunner mergedRunner = new GroupByQueryQueryToolChest().mergeResults(
         new QueryRunner<Row>()
@@ -265,6 +267,22 @@ public class GroupByQueryRunnerTest
 
     TestHelper.assertExpectedObjects(expectedResults, runner.run(fullQuery), "direct");
     TestHelper.assertExpectedObjects(expectedResults, mergedRunner.run(fullQuery), "merged");
+
+    List<Row> allGranExpectedResults = Arrays.<Row>asList(
+        createExpectedRow("2011-04-02", "alias", "automotive", "rows", 2L, "idx", 269L),
+        createExpectedRow("2011-04-02", "alias", "business", "rows", 2L, "idx", 217L),
+        createExpectedRow("2011-04-02", "alias", "entertainment", "rows", 2L, "idx", 319L),
+        createExpectedRow("2011-04-02", "alias", "health", "rows", 2L, "idx", 216L),
+        createExpectedRow("2011-04-02", "alias", "mezzanine", "rows", 6L, "idx", 4420L),
+        createExpectedRow("2011-04-02", "alias", "news", "rows", 2L, "idx", 221L),
+        createExpectedRow("2011-04-02", "alias", "premium", "rows", 6L, "idx", 4416L),
+        createExpectedRow("2011-04-02", "alias", "technology", "rows", 2L, "idx", 177L),
+        createExpectedRow("2011-04-02", "alias", "travel", "rows", 2L, "idx", 243L)
+    );
+
+    TestHelper.assertExpectedObjects(allGranExpectedResults, runner.run(allGranQuery), "direct");
+    TestHelper.assertExpectedObjects(allGranExpectedResults, mergedRunner.run(allGranQuery), "merged");
+
   }
 
   private MapBasedRow createExpectedRow(final String timestamp, Object... vals)