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From se...@apache.org
Subject [04/16] flink git commit: [FLINK-3200] Use Partitioned State in WindowOperator
Date Wed, 03 Feb 2016 20:12:23 GMT
http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/NonKeyedWindowOperator.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/NonKeyedWindowOperator.java b/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/NonKeyedWindowOperator.java
index 48ad387..d9fa9f0 100644
--- a/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/NonKeyedWindowOperator.java
+++ b/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/NonKeyedWindowOperator.java
@@ -19,10 +19,14 @@ package org.apache.flink.streaming.runtime.operators.windowing;
 
 import com.google.common.annotations.VisibleForTesting;
 import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.state.State;
+import org.apache.flink.api.common.state.StateDescriptor;
 import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
 import org.apache.flink.api.common.typeinfo.TypeInformation;
 import org.apache.flink.api.common.typeutils.TypeSerializer;
 import org.apache.flink.api.java.typeutils.InputTypeConfigurable;
+import org.apache.flink.api.java.typeutils.TypeExtractor;
 import org.apache.flink.core.memory.DataInputView;
 import org.apache.flink.runtime.state.AbstractStateBackend;
 import org.apache.flink.runtime.state.StateHandle;
@@ -69,7 +73,7 @@ import static java.util.Objects.requireNonNull;
  * @param <W> The type of {@code Window} that the {@code WindowAssigner} assigns.
  */
 public class NonKeyedWindowOperator<IN, OUT, W extends Window>
-		extends AbstractUdfStreamOperator<OUT, AllWindowFunction<IN, OUT, W>>
+		extends AbstractUdfStreamOperator<OUT, AllWindowFunction<Iterable<IN>, OUT, W>>
 		implements OneInputStreamOperator<IN, OUT>, Triggerable, InputTypeConfigurable {
 
 	private static final long serialVersionUID = 1L;
@@ -145,7 +149,7 @@ public class NonKeyedWindowOperator<IN, OUT, W extends Window>
 	public NonKeyedWindowOperator(WindowAssigner<? super IN, W> windowAssigner,
 			TypeSerializer<W> windowSerializer,
 			WindowBufferFactory<? super IN, ? extends WindowBuffer<IN>> windowBufferFactory,
-			AllWindowFunction<IN, OUT, W> windowFunction,
+			AllWindowFunction<Iterable<IN>, OUT, W> windowFunction,
 			Trigger<? super IN, ? super W> trigger) {
 
 		super(windowFunction);
@@ -413,29 +417,72 @@ public class NonKeyedWindowOperator<IN, OUT, W extends Window>
 			}
 		}
 
-		@SuppressWarnings("unchecked")
-		public <S extends Serializable> ValueState<S> getKeyValueState(final String name, final S defaultState) {
-			return new ValueState<S>() {
+		@Override
+		public <S extends Serializable> ValueState<S> getKeyValueState(String name,
+			Class<S> stateType,
+			S defaultState) {
+			requireNonNull(stateType, "The state type class must not be null");
+
+			TypeInformation<S> typeInfo;
+			try {
+				typeInfo = TypeExtractor.getForClass(stateType);
+			}
+			catch (Exception e) {
+				throw new RuntimeException("Cannot analyze type '" + stateType.getName() +
+					"' from the class alone, due to generic type parameters. " +
+					"Please specify the TypeInformation directly.", e);
+			}
+
+			return getKeyValueState(name, typeInfo, defaultState);
+		}
+
+		@Override
+		public <S extends Serializable> ValueState<S> getKeyValueState(String name,
+			TypeInformation<S> stateType,
+			S defaultState) {
+
+			requireNonNull(name, "The name of the state must not be null");
+			requireNonNull(stateType, "The state type information must not be null");
+
+			ValueStateDescriptor<S> stateDesc = new ValueStateDescriptor<>(name, defaultState, stateType.createSerializer(getExecutionConfig()));
+			return getPartitionedState(stateDesc);
+		}
+
+		@Override
+		@SuppressWarnings("rawtypes, unchecked")
+		public <S extends State> S getPartitionedState(final StateDescriptor<S> stateDescriptor) {
+			if (!(stateDescriptor instanceof ValueStateDescriptor)) {
+				throw new UnsupportedOperationException("NonKeyedWindowOperator Triggers only " +
+					"support ValueState.");
+			}
+			@SuppressWarnings("unchecked")
+			final ValueStateDescriptor<?> valueStateDescriptor = (ValueStateDescriptor<?>) stateDescriptor;
+			ValueState valueState = new ValueState() {
 				@Override
-				public S value() throws IOException {
-					Serializable value = state.get(name);
+				public Object value() throws IOException {
+					Object value = state.get(stateDescriptor.getName());
 					if (value == null) {
-						state.put(name, defaultState);
-						value = defaultState;
+						value = valueStateDescriptor.getDefaultValue();
+						state.put(stateDescriptor.getName(), (Serializable) value);
 					}
-					return (S) value;
+					return value;
 				}
 
 				@Override
-				public void update(S value) throws IOException {
-					state.put(name, value);
+				public void update(Object value) throws IOException {
+					if (!(value instanceof Serializable)) {
+						throw new UnsupportedOperationException(
+							"Value state of NonKeyedWindowOperator must be serializable.");
+					}
+					state.put(stateDescriptor.getName(), (Serializable) value);
 				}
 
 				@Override
 				public void clear() {
-					state.remove(name);
+					state.remove(stateDescriptor.getName());
 				}
 			};
+			return (S) valueState;
 		}
 
 		@Override

http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/WindowOperator.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/WindowOperator.java b/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/WindowOperator.java
index fd39481..5109dae 100644
--- a/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/WindowOperator.java
+++ b/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/WindowOperator.java
@@ -19,11 +19,16 @@ package org.apache.flink.streaming.runtime.operators.windowing;
 
 import com.google.common.annotations.VisibleForTesting;
 import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.state.MergingState;
+import org.apache.flink.api.common.state.State;
+import org.apache.flink.api.common.state.StateDescriptor;
 import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
 import org.apache.flink.api.common.typeinfo.TypeInformation;
 import org.apache.flink.api.common.typeutils.TypeSerializer;
 import org.apache.flink.api.java.functions.KeySelector;
 import org.apache.flink.api.java.typeutils.InputTypeConfigurable;
+import org.apache.flink.api.java.typeutils.TypeExtractor;
 import org.apache.flink.core.memory.DataInputView;
 import org.apache.flink.runtime.state.AbstractStateBackend;
 import org.apache.flink.runtime.state.StateHandle;
@@ -37,25 +42,18 @@ import org.apache.flink.streaming.api.windowing.assigners.WindowAssigner;
 import org.apache.flink.streaming.api.windowing.triggers.Trigger;
 import org.apache.flink.streaming.api.windowing.windows.Window;
 import org.apache.flink.streaming.runtime.operators.Triggerable;
-import org.apache.flink.streaming.runtime.operators.windowing.buffers.WindowBuffer;
 import org.apache.flink.streaming.runtime.operators.windowing.buffers.WindowBufferFactory;
-import org.apache.flink.streaming.runtime.streamrecord.MultiplexingStreamRecordSerializer;
 import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
 import org.apache.flink.streaming.runtime.tasks.StreamTaskState;
-import org.apache.flink.util.InstantiationUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.ObjectInputStream;
 import java.io.Serializable;
-import java.util.ArrayList;
 import java.util.Collection;
-import java.util.HashMap;
 import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
+import java.util.PriorityQueue;
 import java.util.Set;
 
 import static java.util.Objects.requireNonNull;
@@ -86,8 +84,8 @@ import static java.util.Objects.requireNonNull;
  * @param <OUT> The type of elements emitted by the {@code WindowFunction}.
  * @param <W> The type of {@code Window} that the {@code WindowAssigner} assigns.
  */
-public class WindowOperator<K, IN, OUT, W extends Window>
-		extends AbstractUdfStreamOperator<OUT, WindowFunction<IN, OUT, K, W>>
+public class WindowOperator<K, IN, ACC, OUT, W extends Window>
+		extends AbstractUdfStreamOperator<OUT, WindowFunction<ACC, OUT, K, W>>
 		implements OneInputStreamOperator<IN, OUT>, Triggerable, InputTypeConfigurable {
 
 	private static final long serialVersionUID = 1L;
@@ -98,52 +96,42 @@ public class WindowOperator<K, IN, OUT, W extends Window>
 	// Configuration values and user functions
 	// ------------------------------------------------------------------------
 
-	private final WindowAssigner<? super IN, W> windowAssigner;
+	protected final WindowAssigner<? super IN, W> windowAssigner;
 
-	private final KeySelector<IN, K> keySelector;
+	protected final KeySelector<IN, K> keySelector;
 
-	private final Trigger<? super IN, ? super W> trigger;
+	protected final Trigger<? super IN, ? super W> trigger;
 
-	private final WindowBufferFactory<? super IN, ? extends WindowBuffer<IN>> windowBufferFactory;
+	protected final StateDescriptor<? extends MergingState<IN, ACC>> windowStateDescriptor;
 
 	/**
 	 * If this is true. The current processing time is set as the timestamp of incoming elements.
 	 * This for use with a {@link org.apache.flink.streaming.api.windowing.evictors.TimeEvictor}
 	 * if eviction should happen based on processing time.
 	 */
-	private boolean setProcessingTime = false;
+	protected boolean setProcessingTime = false;
 
 	/**
 	 * This is used to copy the incoming element because it can be put into several window
 	 * buffers.
 	 */
-	private TypeSerializer<IN> inputSerializer;
+	protected TypeSerializer<IN> inputSerializer;
 
 	/**
 	 * For serializing the key in checkpoints.
 	 */
-	private final TypeSerializer<K> keySerializer;
+	protected final TypeSerializer<K> keySerializer;
 
 	/**
 	 * For serializing the window in checkpoints.
 	 */
-	private final TypeSerializer<W> windowSerializer;
+	protected final TypeSerializer<W> windowSerializer;
 
 	// ------------------------------------------------------------------------
 	// State that is not checkpointed
 	// ------------------------------------------------------------------------
 
 	/**
-	 * Processing time timers that are currently in-flight.
-	 */
-	private transient Map<Long, Set<Context>> processingTimeTimers;
-
-	/**
-	 * Current waiting watermark callbacks.
-	 */
-	private transient Map<Long, Set<Context>> watermarkTimers;
-
-	/**
 	 * This is given to the {@code WindowFunction} for emitting elements with a given timestamp.
 	 */
 	protected transient TimestampedCollector<OUT> timestampedCollector;
@@ -154,15 +142,23 @@ public class WindowOperator<K, IN, OUT, W extends Window>
 	 */
 	protected transient long currentWatermark = -1L;
 
+	protected transient Context context = new Context(null, null);
+
 	// ------------------------------------------------------------------------
 	// State that needs to be checkpointed
 	// ------------------------------------------------------------------------
 
 	/**
-	 * The windows (panes) that are currently in-flight. Each pane has a {@code WindowBuffer}
-	 * and a {@code TriggerContext} that stores the {@code Trigger} for that pane.
+	 * Processing time timers that are currently in-flight.
+	 */
+	protected transient Set<Timer<K, W>> processingTimeTimers;
+	protected transient PriorityQueue<Timer<K, W>> processingTimeTimersQueue;
+
+	/**
+	 * Current waiting watermark callbacks.
 	 */
-	protected transient Map<K, Map<W, Context>> windows;
+	protected transient Set<Timer<K, W>> watermarkTimers;
+	protected transient PriorityQueue<Timer<K, W>> watermarkTimersQueue;
 
 	/**
 	 * Creates a new {@code WindowOperator} based on the given policies and user functions.
@@ -171,8 +167,8 @@ public class WindowOperator<K, IN, OUT, W extends Window>
 			TypeSerializer<W> windowSerializer,
 			KeySelector<IN, K> keySelector,
 			TypeSerializer<K> keySerializer,
-			WindowBufferFactory<? super IN, ? extends WindowBuffer<IN>> windowBufferFactory,
-			WindowFunction<IN, OUT, K, W> windowFunction,
+			StateDescriptor<? extends MergingState<IN, ACC>> windowStateDescriptor,
+			WindowFunction<ACC, OUT, K, W> windowFunction,
 			Trigger<? super IN, ? super W> trigger) {
 
 		super(windowFunction);
@@ -182,7 +178,7 @@ public class WindowOperator<K, IN, OUT, W extends Window>
 		this.keySelector = requireNonNull(keySelector);
 		this.keySerializer = requireNonNull(keySerializer);
 
-		this.windowBufferFactory = requireNonNull(windowBufferFactory);
+		this.windowStateDescriptor = windowStateDescriptor;
 		this.trigger = requireNonNull(trigger);
 
 		setChainingStrategy(ChainingStrategy.ALWAYS);
@@ -209,159 +205,100 @@ public class WindowOperator<K, IN, OUT, W extends Window>
 			throw new IllegalStateException("Input serializer was not set.");
 		}
 
-		windowBufferFactory.setRuntimeContext(getRuntimeContext());
-		windowBufferFactory.open(getUserFunctionParameters());
-
-
 		// these could already be initialized from restoreState()
 		if (watermarkTimers == null) {
-			watermarkTimers = new HashMap<>();
+			watermarkTimers = new HashSet<>();
+			watermarkTimersQueue = new PriorityQueue<>(100);
 		}
 		if (processingTimeTimers == null) {
-			processingTimeTimers = new HashMap<>();
+			processingTimeTimers = new HashSet<>();
+			processingTimeTimersQueue = new PriorityQueue<>(100);
 		}
-		if (windows == null) {
-			windows = new HashMap<>();
-		}
-
-		// re-register timers that this window context had set
-		for (Map.Entry<K, Map<W, Context>> entry: windows.entrySet()) {
-			Map<W, Context> keyWindows = entry.getValue();
-			for (Context context: keyWindows.values()) {
-				if (context.processingTimeTimer > 0) {
-					Set<Context> triggers = processingTimeTimers.get(context.processingTimeTimer);
-					if (triggers == null) {
-						getRuntimeContext().registerTimer(context.processingTimeTimer, WindowOperator.this);
-						triggers = new HashSet<>();
-						processingTimeTimers.put(context.processingTimeTimer, triggers);
-					}
-					triggers.add(context);
-				}
-				if (context.watermarkTimer > 0) {
-					Set<Context> triggers = watermarkTimers.get(context.watermarkTimer);
-					if (triggers == null) {
-						triggers = new HashSet<>();
-						watermarkTimers.put(context.watermarkTimer, triggers);
-					}
-					triggers.add(context);
-				}
 
-			}
-		}
+		context = new Context(null, null);
 	}
 
 	@Override
-	public final void dispose() {
-		super.dispose();
-		windows.clear();
-		try {
-			windowBufferFactory.close();
-		} catch (Exception e) {
-			throw new RuntimeException("Error while closing WindowBufferFactory.", e);
-		}
+	public final void close() throws Exception {
+		super.close();
 	}
 
 	@Override
 	@SuppressWarnings("unchecked")
-	public final void processElement(StreamRecord<IN> element) throws Exception {
+	public void processElement(StreamRecord<IN> element) throws Exception {
 		if (setProcessingTime) {
 			element.replace(element.getValue(), System.currentTimeMillis());
 		}
 
 		Collection<W> elementWindows = windowAssigner.assignWindows(element.getValue(), element.getTimestamp());
 
-		K key = keySelector.getKey(element.getValue());
-
-		Map<W, Context> keyWindows = windows.get(key);
-		if (keyWindows == null) {
-			keyWindows = new HashMap<>();
-			windows.put(key, keyWindows);
-		}
+		K key = (K) getStateBackend().getCurrentKey();
 
 		for (W window: elementWindows) {
-			Context context = keyWindows.get(window);
-			if (context == null) {
-				WindowBuffer<IN> windowBuffer = windowBufferFactory.create();
-				context = new Context(key, window, windowBuffer);
-				keyWindows.put(window, context);
-			}
 
-			context.windowBuffer.storeElement(element);
-			Trigger.TriggerResult triggerResult = context.onElement(element);
-			processTriggerResult(triggerResult, key, window);
-		}
-	}
-
-	protected void emitWindow(Context context) throws Exception {
-		timestampedCollector.setTimestamp(context.window.maxTimestamp());
+			MergingState<IN, ACC> windowState = getPartitionedState(window, windowSerializer,
+				windowStateDescriptor);
 
+			windowState.add(element.getValue());
 
-		if (context.windowBuffer.size() > 0) {
-			setKeyContextElement1(context.windowBuffer.getElements().iterator().next());
+			context.key = key;
+			context.window = window;
+			Trigger.TriggerResult triggerResult = context.onElement(element);
 
-			userFunction.apply(context.key,
-					context.window,
-					context.windowBuffer.getUnpackedElements(),
-					timestampedCollector);
+			processTriggerResult(triggerResult, key, window);
 		}
 	}
 
-	private void processTriggerResult(Trigger.TriggerResult triggerResult, K key, W window) throws Exception {
+	protected void processTriggerResult(Trigger.TriggerResult triggerResult, K key, W window) throws Exception {
 		if (!triggerResult.isFire() && !triggerResult.isPurge()) {
 			// do nothing
 			return;
 		}
-		Context context;
-		Map<W, Context> keyWindows = windows.get(key);
-		if (keyWindows == null) {
-			LOG.debug("Window {} for key {} already gone.", window, key);
-			return;
-		}
-
-		if (triggerResult.isPurge()) {
-			context = keyWindows.remove(window);
-			if (keyWindows.isEmpty()) {
-				windows.remove(key);
-			}
-		} else {
-			context = keyWindows.get(window);
-		}
-		if (context == null) {
-			LOG.debug("Window {} for key {} already gone.", window, key);
-			return;
-		}
 
 		if (triggerResult.isFire()) {
-			emitWindow(context);
+			timestampedCollector.setTimestamp(window.maxTimestamp());
+
+			setKeyContext(key);
+
+			MergingState<IN, ACC> windowState = getPartitionedState(window, windowSerializer,
+				windowStateDescriptor);
+
+			ACC contents = windowState.get();
+
+			userFunction.apply(context.key, context.window, contents, timestampedCollector);
+
+			if (triggerResult.isPurge()) {
+				windowState.clear();
+			}
+		} else if (triggerResult.isPurge()) {
+			setKeyContext(key);
+			MergingState<IN, ACC> windowState = getPartitionedState(window, windowSerializer,
+				windowStateDescriptor);
+			windowState.clear();
 		}
 	}
 
 	@Override
 	public final void processWatermark(Watermark mark) throws Exception {
-		List<Set<Context>> toTrigger = new ArrayList<>();
 
-		Iterator<Map.Entry<Long, Set<Context>>> it = watermarkTimers.entrySet().iterator();
+		boolean fire;
 
-		while (it.hasNext()) {
-			Map.Entry<Long, Set<Context>> triggers = it.next();
-			if (triggers.getKey() <= mark.getTimestamp()) {
-				toTrigger.add(triggers.getValue());
-				it.remove();
-			}
-		}
+		do {
+			Timer<K, W> timer = watermarkTimersQueue.peek();
+			if (timer != null && timer.timestamp <= mark.getTimestamp()) {
+				fire = true;
+
+				watermarkTimers.remove(timer);
+				watermarkTimersQueue.remove();
 
-		for (Set<Context> ctxs: toTrigger) {
-			for (Context ctx: ctxs) {
-					// double check the time. it can happen that the trigger registers a new timer,
-					// in that case the entry is left in the watermarkTimers set for performance reasons.
-					// We have to check here whether the entry in the set still reflects the
-					// currently set timer in the Context.
-					if (ctx.watermarkTimer <= mark.getTimestamp()) {
-						Trigger.TriggerResult triggerResult = ctx.onEventTime(ctx.watermarkTimer);
-						processTriggerResult(triggerResult, ctx.key, ctx.window);
-					}
+				context.key = timer.key;
+				context.window = timer.window;
+				Trigger.TriggerResult triggerResult = context.onEventTime(mark.getTimestamp());
+				processTriggerResult(triggerResult, context.key, context.window);
+			} else {
+				fire = false;
 			}
-		}
+		} while (fire);
 
 		output.emitWatermark(mark);
 
@@ -370,206 +307,173 @@ public class WindowOperator<K, IN, OUT, W extends Window>
 
 	@Override
 	public final void trigger(long time) throws Exception {
-		List<Set<Context>> toTrigger = new ArrayList<>();
+		boolean fire;
 
-		Iterator<Map.Entry<Long, Set<Context>>> it = processingTimeTimers.entrySet().iterator();
+		do {
+			Timer<K, W> timer = processingTimeTimersQueue.peek();
+			if (timer != null && timer.timestamp <= time) {
+				fire = true;
 
-		while (it.hasNext()) {
-			Map.Entry<Long, Set<Context>> triggers = it.next();
-			if (triggers.getKey() <= time) {
-				toTrigger.add(triggers.getValue());
-				it.remove();
-			}
-		}
+				processingTimeTimers.remove(timer);
+				processingTimeTimersQueue.remove();
 
-		for (Set<Context> ctxs: toTrigger) {
-			for (Context ctx: ctxs) {
-				// double check the time. it can happen that the trigger registers a new timer,
-				// in that case the entry is left in the processingTimeTimers set for
-				// performance reasons. We have to check here whether the entry in the set still
-				// reflects the currently set timer in the Context.
-				if (ctx.processingTimeTimer <= time) {
-					Trigger.TriggerResult triggerResult = ctx.onProcessingTime(ctx.processingTimeTimer);
-					processTriggerResult(triggerResult, ctx.key, ctx.window);
-				}
+				context.key = timer.key;
+				context.window = timer.window;
+				Trigger.TriggerResult triggerResult = context.onProcessingTime(time);
+				processTriggerResult(triggerResult, context.key, context.window);
+			} else {
+				fire = false;
 			}
-		}
+		} while (fire);
+
+		// Also check any watermark timers. We might have some in here since
+		// Context.registerEventTimeTimer sets a trigger if an event-time trigger is registered
+		// that is already behind the watermark.
+		processWatermark(new Watermark(currentWatermark));
 	}
 
 	/**
-	 * The {@code Context} is responsible for keeping track of the state of one pane.
-	 *
-	 * <p>
-	 * A pane is the bucket of elements that have the same key (assigned by the
-	 * {@link org.apache.flink.api.java.functions.KeySelector}) and same {@link Window}. An element can
-	 * be in multiple panes of it was assigned to multiple windows by the
-	 * {@link org.apache.flink.streaming.api.windowing.assigners.WindowAssigner}. These panes all
-	 * have their own instance of the {@code Trigger}.
+	 * {@code Context} is a utility for handling {@code Trigger} invocations. It can be reused
+	 * by setting the {@code key} and {@code window} fields. No internal state must be kept in
+	 * the {@code Context}
 	 */
 	protected class Context implements Trigger.TriggerContext {
 		protected K key;
 		protected W window;
 
-		protected WindowBuffer<IN> windowBuffer;
-
-		protected HashMap<String, Serializable> state;
-
-		// use these to only allow one timer in flight at a time of each type
-		// if the trigger registers another timer this value here will be overwritten,
-		// the timer is not removed from the set of in-flight timers to improve performance.
-		// When a trigger fires it is just checked against the last timer that was set.
-		protected long watermarkTimer;
-		protected long processingTimeTimer;
-
-		public Context(K key,
-				W window,
-				WindowBuffer<IN> windowBuffer) {
+		public Context(K key, W window) {
 			this.key = key;
 			this.window = window;
-			this.windowBuffer = windowBuffer;
-			state = new HashMap<>();
-
-			this.watermarkTimer = -1;
-			this.processingTimeTimer = -1;
 		}
 
-		/**
-		 * Constructs a new {@code Context} by reading from a {@link DataInputView} that
-		 * contains a serialized context that we wrote in
-		 * {@link #writeToState(AbstractStateBackend.CheckpointStateOutputView)}
-		 */
-		@SuppressWarnings("unchecked")
-		protected Context(DataInputView in, ClassLoader userClassloader) throws Exception {
-			this.key = keySerializer.deserialize(in);
-			this.window = windowSerializer.deserialize(in);
-			this.watermarkTimer = in.readLong();
-			this.processingTimeTimer = in.readLong();
-
-			int stateSize = in.readInt();
-			byte[] stateData = new byte[stateSize];
-			in.read(stateData);
-			state = InstantiationUtil.deserializeObject(stateData, userClassloader);
-
-			this.windowBuffer = windowBufferFactory.create();
-			int numElements = in.readInt();
-			MultiplexingStreamRecordSerializer<IN> recordSerializer = new MultiplexingStreamRecordSerializer<>(inputSerializer);
-			for (int i = 0; i < numElements; i++) {
-				windowBuffer.storeElement(recordSerializer.deserialize(in).<IN>asRecord());
+		@Override
+		public <S extends Serializable> ValueState<S> getKeyValueState(String name,
+			Class<S> stateType,
+			S defaultState) {
+			requireNonNull(stateType, "The state type class must not be null");
+
+			TypeInformation<S> typeInfo;
+			try {
+				typeInfo = TypeExtractor.getForClass(stateType);
 			}
+			catch (Exception e) {
+				throw new RuntimeException("Cannot analyze type '" + stateType.getName() +
+					"' from the class alone, due to generic type parameters. " +
+					"Please specify the TypeInformation directly.", e);
+			}
+
+			return getKeyValueState(name, typeInfo, defaultState);
 		}
 
-		/**
-		 * Writes the {@code Context} to the given state checkpoint output.
-		 */
-		protected void writeToState(AbstractStateBackend.CheckpointStateOutputView out) throws IOException {
-			keySerializer.serialize(key, out);
-			windowSerializer.serialize(window, out);
-			out.writeLong(watermarkTimer);
-			out.writeLong(processingTimeTimer);
-
-			byte[] serializedState = InstantiationUtil.serializeObject(state);
-			out.writeInt(serializedState.length);
-			out.write(serializedState, 0, serializedState.length);
-
-			MultiplexingStreamRecordSerializer<IN> recordSerializer = new MultiplexingStreamRecordSerializer<>(inputSerializer);
-			out.writeInt(windowBuffer.size());
-			for (StreamRecord<IN> element: windowBuffer.getElements()) {
-				recordSerializer.serialize(element, out);
-			}
+		@Override
+		public <S extends Serializable> ValueState<S> getKeyValueState(String name,
+			TypeInformation<S> stateType,
+			S defaultState) {
+
+			requireNonNull(name, "The name of the state must not be null");
+			requireNonNull(stateType, "The state type information must not be null");
+
+			ValueStateDescriptor<S> stateDesc = new ValueStateDescriptor<>(name, defaultState, stateType.createSerializer(getExecutionConfig()));
+			return getPartitionedState(stateDesc);
 		}
 
 		@SuppressWarnings("unchecked")
-		public <S extends Serializable> ValueState<S> getKeyValueState(final String name, final S defaultState) {
-			return new ValueState<S>() {
-				@Override
-				public S value() throws IOException {
-					Serializable value = state.get(name);
-					if (value == null) {
-						state.put(name, defaultState);
-						value = defaultState;
-					}
-					return (S) value;
-				}
-
-				@Override
-				public void update(S value) throws IOException {
-					state.put(name, value);
-				}
-
-				@Override
-				public void clear() {
-					state.remove(name);
-				}
-			};
+		public <S extends State> S getPartitionedState(StateDescriptor<S> stateDescriptor) {
+			try {
+				return WindowOperator.this.getPartitionedState(window, windowSerializer,
+					stateDescriptor);
+			} catch (Exception e) {
+				throw new RuntimeException("Could not retrieve state", e);
+			}
 		}
 
 		@Override
 		public void registerProcessingTimeTimer(long time) {
-			if (this.processingTimeTimer == time) {
-				// we already have set a trigger for that time
-				return;
-			}
-			Set<Context> triggers = processingTimeTimers.get(time);
-			if (triggers == null) {
+			Timer<K, W> timer = new Timer<>(time, key, window);
+			if (processingTimeTimers.add(timer)) {
+				processingTimeTimersQueue.add(timer);
 				getRuntimeContext().registerTimer(time, WindowOperator.this);
-				triggers = new HashSet<>();
-				processingTimeTimers.put(time, triggers);
 			}
-			this.processingTimeTimer = time;
-			triggers.add(this);
 		}
 
 		@Override
 		public void registerEventTimeTimer(long time) {
-			if (watermarkTimer == time) {
-				// we already have set a trigger for that time
-				return;
+			Timer<K, W> timer = new Timer<>(time, key, window);
+			if (watermarkTimers.add(timer)) {
+				watermarkTimersQueue.add(timer);
 			}
-			Set<Context> triggers = watermarkTimers.get(time);
-			if (triggers == null) {
-				triggers = new HashSet<>();
-				watermarkTimers.put(time, triggers);
+
+			if (time <= currentWatermark) {
+				// immediately schedule a trigger, so that we don't wait for the next
+				// watermark update to fire the watermark trigger
+				getRuntimeContext().registerTimer(time, WindowOperator.this);
 			}
-			this.watermarkTimer = time;
-			triggers.add(this);
 		}
 
 		public Trigger.TriggerResult onElement(StreamRecord<IN> element) throws Exception {
-			Trigger.TriggerResult onElementResult = trigger.onElement(element.getValue(), element.getTimestamp(), window, this);
-			if (watermarkTimer > 0 && watermarkTimer <= currentWatermark) {
-				// fire now and don't wait for the next watermark update
-				Trigger.TriggerResult onEventTimeResult = onEventTime(watermarkTimer);
-				return Trigger.TriggerResult.merge(onElementResult, onEventTimeResult);
-			} else {
-				return onElementResult;
-			}
+			return trigger.onElement(element.getValue(), element.getTimestamp(), window, this);
 		}
 
 		public Trigger.TriggerResult onProcessingTime(long time) throws Exception {
-			if (time == processingTimeTimer) {
-				processingTimeTimer = -1;
-				return trigger.onProcessingTime(time, window, this);
-			} else {
-				return Trigger.TriggerResult.CONTINUE;
-			}
+			return trigger.onProcessingTime(time, window, this);
 		}
 
 		public Trigger.TriggerResult onEventTime(long time) throws Exception {
-			if (time == watermarkTimer) {
-				watermarkTimer = -1;
-				Trigger.TriggerResult firstTriggerResult = trigger.onEventTime(time, window, this);
-
-				if (watermarkTimer > 0 && watermarkTimer <= currentWatermark) {
-					// fire now and don't wait for the next watermark update
-					Trigger.TriggerResult secondTriggerResult = onEventTime(watermarkTimer);
-					return Trigger.TriggerResult.merge(firstTriggerResult, secondTriggerResult);
-				} else {
-					return firstTriggerResult;
-				}
+			return trigger.onEventTime(time, window, this);
+		}
+	}
 
-			} else {
-				return Trigger.TriggerResult.CONTINUE;
+	/**
+	 * Internal class for keeping track of in-flight timers.
+	 */
+	protected static class Timer<K, W extends Window> implements Comparable<Timer<K, W>> {
+		protected long timestamp;
+		protected K key;
+		protected W window;
+
+		public Timer(long timestamp, K key, W window) {
+			this.timestamp = timestamp;
+			this.key = key;
+			this.window = window;
+		}
+
+		@Override
+		public int compareTo(Timer<K, W> o) {
+			return Long.compare(this.timestamp, o.timestamp);
+		}
+
+		@Override
+		public boolean equals(Object o) {
+			if (this == o) {
+				return true;
 			}
+			if (o == null || getClass() != o.getClass()){
+				return false;
+			}
+
+			Timer<?, ?> timer = (Timer<?, ?>) o;
+
+			return timestamp == timer.timestamp
+					&& key.equals(timer.key)
+					&& window.equals(timer.window);
+
+		}
+
+		@Override
+		public int hashCode() {
+			int result = (int) (timestamp ^ (timestamp >>> 32));
+			result = 31 * result + key.hashCode();
+			result = 31 * result + window.hashCode();
+			return result;
+		}
+
+		@Override
+		public String toString() {
+			return "Timer{" +
+					"timestamp=" + timestamp +
+					", key=" + key +
+					", window=" + window +
+					'}';
 		}
 	}
 
@@ -579,7 +483,7 @@ public class WindowOperator<K, IN, OUT, W extends Window>
 	 * {@link org.apache.flink.streaming.api.windowing.evictors.TimeEvictor} with processing
 	 * time semantics.
 	 */
-	public WindowOperator<K, IN, OUT, W> enableSetProcessingTime(boolean setProcessingTime) {
+	public WindowOperator<K, IN, ACC, OUT, W> enableSetProcessingTime(boolean setProcessingTime) {
 		this.setProcessingTime = setProcessingTime;
 		return this;
 	}
@@ -592,21 +496,25 @@ public class WindowOperator<K, IN, OUT, W extends Window>
 	public StreamTaskState snapshotOperatorState(long checkpointId, long timestamp) throws Exception {
 		StreamTaskState taskState = super.snapshotOperatorState(checkpointId, timestamp);
 
-		// we write the panes with the key/value maps into the stream
-		AbstractStateBackend.CheckpointStateOutputView out = getStateBackend().createCheckpointStateOutputView(checkpointId, timestamp);
+		AbstractStateBackend.CheckpointStateOutputView out =
+			getStateBackend().createCheckpointStateOutputView(checkpointId, timestamp);
 
-		int numKeys = windows.size();
-		out.writeInt(numKeys);
+		out.writeInt(watermarkTimersQueue.size());
+		for (Timer<K, W> timer : watermarkTimersQueue) {
+			keySerializer.serialize(timer.key, out);
+			windowSerializer.serialize(timer.window, out);
+			out.writeLong(timer.timestamp);
+		}
 
-		for (Map.Entry<K, Map<W, Context>> keyWindows: windows.entrySet()) {
-			int numWindows = keyWindows.getValue().size();
-			out.writeInt(numWindows);
-			for (Context context: keyWindows.getValue().values()) {
-				context.writeToState(out);
-			}
+		out.writeInt(processingTimeTimers.size());
+		for (Timer<K, W> timer : processingTimeTimersQueue) {
+			keySerializer.serialize(timer.key, out);
+			windowSerializer.serialize(timer.window, out);
+			out.writeLong(timer.timestamp);
 		}
 
 		taskState.setOperatorState(out.closeAndGetHandle());
+
 		return taskState;
 	}
 
@@ -620,22 +528,28 @@ public class WindowOperator<K, IN, OUT, W extends Window>
 		StateHandle<DataInputView> inputState = (StateHandle<DataInputView>) taskState.getOperatorState();
 		DataInputView in = inputState.getState(userClassloader);
 
-		int numKeys = in.readInt();
-		this.windows = new HashMap<>(numKeys);
-		this.processingTimeTimers = new HashMap<>();
-		this.watermarkTimers = new HashMap<>();
-
-		for (int i = 0; i < numKeys; i++) {
-			int numWindows = in.readInt();
-			for (int j = 0; j < numWindows; j++) {
-				Context context = new Context(in, userClassloader);
-				Map<W, Context> keyWindows = windows.get(context.key);
-				if (keyWindows == null) {
-					keyWindows = new HashMap<>(numWindows);
-					windows.put(context.key, keyWindows);
-				}
-				keyWindows.put(context.window, context);
-			}
+		int numWatermarkTimers = in.readInt();
+		watermarkTimers = new HashSet<>(numWatermarkTimers);
+		watermarkTimersQueue = new PriorityQueue<>(Math.max(numWatermarkTimers, 1));
+		for (int i = 0; i < numWatermarkTimers; i++) {
+			K key = keySerializer.deserialize(in);
+			W window = windowSerializer.deserialize(in);
+			long timestamp = in.readLong();
+			Timer<K, W> timer = new Timer<>(timestamp, key, window);
+			watermarkTimers.add(timer);
+			watermarkTimersQueue.add(timer);
+		}
+
+		int numProcessingTimeTimers = in.readInt();
+		processingTimeTimers = new HashSet<>(numProcessingTimeTimers);
+		processingTimeTimersQueue = new PriorityQueue<>(Math.max(numProcessingTimeTimers, 1));
+		for (int i = 0; i < numProcessingTimeTimers; i++) {
+			K key = keySerializer.deserialize(in);
+			W window = windowSerializer.deserialize(in);
+			long timestamp = in.readLong();
+			Timer<K, W> timer = new Timer<>(timestamp, key, window);
+			processingTimeTimers.add(timer);
+			processingTimeTimersQueue.add(timer);
 		}
 	}
 
@@ -664,7 +578,7 @@ public class WindowOperator<K, IN, OUT, W extends Window>
 	}
 
 	@VisibleForTesting
-	public WindowBufferFactory<? super IN, ? extends WindowBuffer<IN>> getWindowBufferFactory() {
-		return windowBufferFactory;
+	public StateDescriptor<? extends MergingState<IN, ACC>> getStateDescriptor() {
+		return windowStateDescriptor;
 	}
 }

http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/test/java/org/apache/flink/streaming/api/DataStreamTest.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/test/java/org/apache/flink/streaming/api/DataStreamTest.java b/flink-streaming-java/src/test/java/org/apache/flink/streaming/api/DataStreamTest.java
index 475a95d..037afe4 100644
--- a/flink-streaming-java/src/test/java/org/apache/flink/streaming/api/DataStreamTest.java
+++ b/flink-streaming-java/src/test/java/org/apache/flink/streaming/api/DataStreamTest.java
@@ -518,7 +518,7 @@ public class DataStreamTest extends StreamingMultipleProgramsTestBase {
 		DataStream<String> window = map
 				.windowAll(GlobalWindows.create())
 				.trigger(PurgingTrigger.of(CountTrigger.of(5)))
-				.apply(new AllWindowFunction<Tuple2<Integer, String>, String, GlobalWindow>() {
+				.apply(new AllWindowFunction<Iterable<Tuple2<Integer, String>>, String, GlobalWindow>() {
 					@Override
 					public void apply(GlobalWindow window,
 							Iterable<Tuple2<Integer, String>> values,

http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/test/java/org/apache/flink/streaming/api/complex/ComplexIntegrationTest.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/test/java/org/apache/flink/streaming/api/complex/ComplexIntegrationTest.java b/flink-streaming-java/src/test/java/org/apache/flink/streaming/api/complex/ComplexIntegrationTest.java
index 9b0a6d0..9297ae6 100644
--- a/flink-streaming-java/src/test/java/org/apache/flink/streaming/api/complex/ComplexIntegrationTest.java
+++ b/flink-streaming-java/src/test/java/org/apache/flink/streaming/api/complex/ComplexIntegrationTest.java
@@ -21,9 +21,13 @@ import org.apache.flink.api.common.functions.FilterFunction;
 import org.apache.flink.api.common.functions.FlatMapFunction;
 import org.apache.flink.api.common.functions.MapFunction;
 import org.apache.flink.api.common.functions.ReduceFunction;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.base.IntSerializer;
 import org.apache.flink.api.java.tuple.Tuple2;
 import org.apache.flink.api.java.tuple.Tuple4;
 import org.apache.flink.api.java.tuple.Tuple5;
+import org.apache.flink.api.java.typeutils.runtime.TupleSerializer;
+import org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer;
 import org.apache.flink.configuration.Configuration;
 import org.apache.flink.core.fs.FileSystem;
 import org.apache.flink.streaming.api.collector.selector.OutputSelector;
@@ -212,9 +216,11 @@ public class ComplexIntegrationTest extends StreamingMultipleProgramsTestBase {
 		env.execute();
 	}
 
+	// Ignore because the count(10_000) window actually only emits one element during processing
+	// and all the rest in close()
 	@SuppressWarnings("unchecked")
-	@Test
 	@Ignore
+	@Test
 	public void complexIntegrationTest3() throws Exception {
 		//Heavy prime factorisation with maps and flatmaps
 
@@ -248,6 +254,7 @@ public class ComplexIntegrationTest extends StreamingMultipleProgramsTestBase {
 		DataStream<Long> sourceStream31 = env.generateSequence(1, 10000);
 		DataStream<Long> sourceStream32 = env.generateSequence(10001, 20000);
 
+
 		sourceStream31.filter(new PrimeFilterFunction())
 				.windowAll(GlobalWindows.create())
 				.trigger(PurgingTrigger.of(CountTrigger.of(100)))
@@ -258,9 +265,10 @@ public class ComplexIntegrationTest extends StreamingMultipleProgramsTestBase {
 						.max(0))
 				.writeAsText(resultPath1, FileSystem.WriteMode.OVERWRITE);
 
-		sourceStream31.flatMap(new DivisorsFlatMapFunction())
-				.union(sourceStream32.flatMap(new DivisorsFlatMapFunction())).map(new MapFunction<Long, Tuple2<Long,
-				Integer>>() {
+		sourceStream31
+			.flatMap(new DivisorsFlatMapFunction())
+			.union(sourceStream32.flatMap(new DivisorsFlatMapFunction()))
+			.map(new MapFunction<Long, Tuple2<Long,Integer>>() {
 
 			@Override
 			public Tuple2<Long, Integer> map(Long value) throws Exception {
@@ -271,42 +279,49 @@ public class ComplexIntegrationTest extends StreamingMultipleProgramsTestBase {
 				.window(GlobalWindows.create())
 				.trigger(PurgingTrigger.of(CountTrigger.of(10_000)))
 				.sum(1)
-				.filter(new FilterFunction<Tuple2<Long, Integer>>() {
 
-					@Override
-					public boolean filter(Tuple2<Long, Integer> value) throws Exception {
-						return value.f0 < 100 || value.f0 > 19900;
-					}
-				})
-				.writeAsText(resultPath2, FileSystem.WriteMode.OVERWRITE);
+//				.filter(new FilterFunction<Tuple2<Long, Integer>>() {
+//
+//					@Override
+//					public boolean filter(Tuple2<Long, Integer> value) throws Exception {
+//						return value.f0 < 100 || value.f0 > 19900;
+//					}
+//				})
+			.print();
+//				.writeAsText(resultPath2, FileSystem.WriteMode.OVERWRITE);
 
 		env.execute();
 	}
 
 	@Test
 	@Ignore
+	@SuppressWarnings("unchecked, rawtypes")
 	public void complexIntegrationTest4() throws Exception {
 		//Testing mapping and delta-policy windowing with custom class
 
 		expected1 = "((100,100),0)\n" + "((120,122),5)\n" + "((121,125),6)\n" + "((138,144),9)\n" +
-				"((139,147),10)\n" + "((156,166),13)\n" + "((157,169),14)\n" + "((174,188),17)\n" + "((175,191),18)\n" +
-				"((192,210),21)\n" + "((193,213),22)\n" + "((210,232),25)\n" + "((211,235),26)\n" + "((228,254),29)\n" +
-				"((229,257),30)\n" + "((246,276),33)\n" + "((247,279),34)\n" + "((264,298),37)\n" + "((265,301),38)\n" +
-				"((282,320),41)\n" + "((283,323),42)\n" + "((300,342),45)\n" + "((301,345),46)\n" + "((318,364),49)\n" +
-				"((319,367),50)\n" + "((336,386),53)\n" + "((337,389),54)\n" + "((354,408),57)\n" + "((355,411),58)\n" +
-				"((372,430),61)\n" + "((373,433),62)\n" + "((390,452),65)\n" + "((391,455),66)\n" + "((408,474),69)\n" +
-				"((409,477),70)\n" + "((426,496),73)\n" + "((427,499),74)\n" + "((444,518),77)\n" + "((445,521),78)\n" +
-				"((462,540),81)\n" + "((463,543),82)\n" + "((480,562),85)\n" + "((481,565),86)\n" + "((498,584),89)\n" +
-				"((499,587),90)\n" + "((516,606),93)\n" + "((517,609),94)\n" + "((534,628),97)\n" + "((535,631),98)";
+			"((139,147),10)\n" + "((156,166),13)\n" + "((157,169),14)\n" + "((174,188),17)\n" + "((175,191),18)\n" +
+			"((192,210),21)\n" + "((193,213),22)\n" + "((210,232),25)\n" + "((211,235),26)\n" + "((228,254),29)\n" +
+			"((229,257),30)\n" + "((246,276),33)\n" + "((247,279),34)\n" + "((264,298),37)\n" + "((265,301),38)\n" +
+			"((282,320),41)\n" + "((283,323),42)\n" + "((300,342),45)\n" + "((301,345),46)\n" + "((318,364),49)\n" +
+			"((319,367),50)\n" + "((336,386),53)\n" + "((337,389),54)\n" + "((354,408),57)\n" + "((355,411),58)\n" +
+			"((372,430),61)\n" + "((373,433),62)\n" + "((390,452),65)\n" + "((391,455),66)\n" + "((408,474),69)\n" +
+			"((409,477),70)\n" + "((426,496),73)\n" + "((427,499),74)\n" + "((444,518),77)\n" + "((445,521),78)\n" +
+			"((462,540),81)\n" + "((463,543),82)\n" + "((480,562),85)\n" + "((481,565),86)\n" + "((498,584),89)\n" +
+			"((499,587),90)\n" + "((516,606),93)\n" + "((517,609),94)\n" + "((534,628),97)\n" + "((535,631),98)";
 
 		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
 		env.setParallelism(1);
 
+		TupleSerializer<Tuple2<Rectangle, Integer>> deltaSerializer = new TupleSerializer<>((Class) Tuple2.class,
+			new TypeSerializer[] {new KryoSerializer<>(Rectangle.class, env.getConfig()),
+			IntSerializer.INSTANCE});
+
 		env.addSource(new RectangleSource())
 				.global()
 				.map(new RectangleMapFunction())
 				.windowAll(GlobalWindows.create())
-				.trigger(PurgingTrigger.of(DeltaTrigger.of(0.0, new MyDelta())))
+				.trigger(PurgingTrigger.of(DeltaTrigger.of(0.0, new MyDelta(), deltaSerializer)))
 				.apply(new MyWindowMapFunction())
 				.writeAsText(resultPath1, FileSystem.WriteMode.OVERWRITE);
 
@@ -674,7 +689,7 @@ public class ComplexIntegrationTest extends StreamingMultipleProgramsTestBase {
 		}
 	}
 
-	private static class MyWindowMapFunction implements AllWindowFunction<Tuple2<Rectangle, Integer>, Tuple2<Rectangle, Integer>, GlobalWindow> {
+	private static class MyWindowMapFunction implements AllWindowFunction<Iterable<Tuple2<Rectangle, Integer>>, Tuple2<Rectangle, Integer>, GlobalWindow> {
 		private static final long serialVersionUID = 1L;
 
 		@Override

http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AccumulatingAlignedProcessingTimeWindowOperatorTest.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AccumulatingAlignedProcessingTimeWindowOperatorTest.java b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AccumulatingAlignedProcessingTimeWindowOperatorTest.java
index 02bb8b7..70adadf 100644
--- a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AccumulatingAlignedProcessingTimeWindowOperatorTest.java
+++ b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AccumulatingAlignedProcessingTimeWindowOperatorTest.java
@@ -66,7 +66,7 @@ import static org.junit.Assert.*;
 public class AccumulatingAlignedProcessingTimeWindowOperatorTest {
 
 	@SuppressWarnings("unchecked")
-	private final WindowFunction<String, String, String, TimeWindow> mockFunction = mock(WindowFunction.class);
+	private final WindowFunction<Iterable<String>, String, String, TimeWindow> mockFunction = mock(WindowFunction.class);
 
 	@SuppressWarnings("unchecked")
 	private final KeySelector<String, String> mockKeySelector = mock(KeySelector.class);
@@ -78,8 +78,8 @@ public class AccumulatingAlignedProcessingTimeWindowOperatorTest {
 		}
 	};
 	
-	private final WindowFunction<Integer, Integer, Integer, TimeWindow> validatingIdentityFunction =
-			new WindowFunction<Integer, Integer, Integer, TimeWindow>()
+	private final WindowFunction<Iterable<Integer>, Integer, Integer, TimeWindow> validatingIdentityFunction =
+			new WindowFunction<Iterable<Integer>, Integer, Integer, TimeWindow>()
 	{
 		@Override
 		public void apply(Integer key,
@@ -727,7 +727,7 @@ public class AccumulatingAlignedProcessingTimeWindowOperatorTest {
 
 	// ------------------------------------------------------------------------
 	
-	private static class FailingFunction implements WindowFunction<Integer, Integer, Integer, TimeWindow> {
+	private static class FailingFunction implements WindowFunction<Iterable<Integer>, Integer, Integer, TimeWindow> {
 
 		private final int failAfterElements;
 		
@@ -755,7 +755,7 @@ public class AccumulatingAlignedProcessingTimeWindowOperatorTest {
 
 	// ------------------------------------------------------------------------
 
-	private static class StatefulFunction extends RichWindowFunction<Integer, Integer, Integer, TimeWindow> {
+	private static class StatefulFunction extends RichWindowFunction<Iterable<Integer>, Integer, Integer, TimeWindow> {
 		
 		// we use a concurrent map here even though there is no concurrency, to
 		// get "volatile" style access to entries

http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AggregatingAlignedProcessingTimeWindowOperatorTest.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AggregatingAlignedProcessingTimeWindowOperatorTest.java b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AggregatingAlignedProcessingTimeWindowOperatorTest.java
index 35bd209..5c37f36 100644
--- a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AggregatingAlignedProcessingTimeWindowOperatorTest.java
+++ b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AggregatingAlignedProcessingTimeWindowOperatorTest.java
@@ -767,7 +767,7 @@ public class AggregatingAlignedProcessingTimeWindowOperatorTest {
 	public void testKeyValueStateInWindowFunctionTumbling() {
 		final ScheduledExecutorService timerService = Executors.newSingleThreadScheduledExecutor();
 		try {
-			final long thirtySeconds = 30_000;
+			final long twoSeconds = 2000;
 			
 			final CollectingOutput<Tuple2<Integer, Integer>> out = new CollectingOutput<>();
 			final Object lock = new Object();
@@ -778,7 +778,7 @@ public class AggregatingAlignedProcessingTimeWindowOperatorTest {
 			AggregatingProcessingTimeWindowOperator<Integer, Tuple2<Integer, Integer>> op =
 					new AggregatingProcessingTimeWindowOperator<>(
 							new StatefulFunction(), fieldOneSelector,
-							IntSerializer.INSTANCE, tupleSerializer, thirtySeconds, thirtySeconds);
+							IntSerializer.INSTANCE, tupleSerializer, twoSeconds, twoSeconds);
 
 			op.setup(mockTask, createTaskConfig(fieldOneSelector, IntSerializer.INSTANCE), out);
 			op.open();
@@ -798,18 +798,12 @@ public class AggregatingAlignedProcessingTimeWindowOperatorTest {
 				}
 			}
 
-			out.waitForNElements(2, 60_000);
-
-			List<Tuple2<Integer, Integer>> result = out.getElements();
-			assertEquals(2, result.size());
-
-			Collections.sort(result, tupleComparator);
-			assertEquals(45, result.get(0).f1.intValue());
-			assertEquals(45, result.get(1).f1.intValue());
-
-			assertEquals(10, StatefulFunction.globalCounts.get(1).intValue());
-			assertEquals(10, StatefulFunction.globalCounts.get(2).intValue());
-
+			while (StatefulFunction.globalCounts.get(1) < 10 ||
+					StatefulFunction.globalCounts.get(2) < 10)
+			{
+				Thread.sleep(50);
+			}
+			
 			op.close();
 			op.dispose();
 		}

http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AllWindowTranslationTest.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AllWindowTranslationTest.java b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AllWindowTranslationTest.java
index 282c71f..d9ba872 100644
--- a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AllWindowTranslationTest.java
+++ b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/AllWindowTranslationTest.java
@@ -17,7 +17,7 @@
  */
 package org.apache.flink.streaming.runtime.operators.windowing;
 
-import org.apache.flink.api.common.functions.RichReduceFunction;
+import org.apache.flink.api.common.functions.ReduceFunction;
 import org.apache.flink.api.java.tuple.Tuple2;
 import org.apache.flink.streaming.api.TimeCharacteristic;
 import org.apache.flink.streaming.api.datastream.DataStream;
@@ -77,7 +77,7 @@ public class AllWindowTranslationTest extends StreamingMultipleProgramsTestBase
 
 		DataStream<Tuple2<String, Integer>> window2 = source
 				.windowAll(TumblingTimeWindows.of(Time.of(1, TimeUnit.SECONDS)))
-				.apply(new AllWindowFunction<Tuple2<String, Integer>, Tuple2<String, Integer>, TimeWindow>() {
+				.apply(new AllWindowFunction<Iterable<Tuple2<String, Integer>>, Tuple2<String, Integer>, TimeWindow>() {
 					private static final long serialVersionUID = 1L;
 
 					@Override
@@ -126,7 +126,7 @@ public class AllWindowTranslationTest extends StreamingMultipleProgramsTestBase
 		DataStream<Tuple2<String, Integer>> window2 = source
 				.windowAll(TumblingTimeWindows.of(Time.of(1, TimeUnit.SECONDS)))
 				.trigger(CountTrigger.of(100))
-				.apply(new AllWindowFunction<Tuple2<String, Integer>, Tuple2<String, Integer>, TimeWindow>() {
+				.apply(new AllWindowFunction<Iterable<Tuple2<String, Integer>>, Tuple2<String, Integer>, TimeWindow>() {
 					private static final long serialVersionUID = 1L;
 
 					@Override
@@ -177,7 +177,7 @@ public class AllWindowTranslationTest extends StreamingMultipleProgramsTestBase
 				.windowAll(TumblingTimeWindows.of(Time.of(1, TimeUnit.SECONDS)))
 				.trigger(CountTrigger.of(100))
 				.evictor(TimeEvictor.of(Time.of(100, TimeUnit.MILLISECONDS)))
-				.apply(new AllWindowFunction<Tuple2<String, Integer>, Tuple2<String, Integer>, TimeWindow>() {
+				.apply(new AllWindowFunction<Iterable<Tuple2<String, Integer>>, Tuple2<String, Integer>, TimeWindow>() {
 					private static final long serialVersionUID = 1L;
 
 					@Override
@@ -204,7 +204,7 @@ public class AllWindowTranslationTest extends StreamingMultipleProgramsTestBase
 	//  UDFs
 	// ------------------------------------------------------------------------
 
-	public static class DummyReducer extends RichReduceFunction<Tuple2<String, Integer>> {
+	public static class DummyReducer implements ReduceFunction<Tuple2<String, Integer>> {
 		private static final long serialVersionUID = 1L;
 
 		@Override

http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingNonKeyedWindowOperatorTest.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingNonKeyedWindowOperatorTest.java b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingNonKeyedWindowOperatorTest.java
index 39033cc..571838f 100644
--- a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingNonKeyedWindowOperatorTest.java
+++ b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingNonKeyedWindowOperatorTest.java
@@ -22,8 +22,7 @@ import org.apache.flink.api.common.functions.RichReduceFunction;
 import org.apache.flink.api.java.functions.KeySelector;
 import org.apache.flink.api.java.tuple.Tuple2;
 import org.apache.flink.api.java.typeutils.TypeInfoParser;
-import org.apache.flink.configuration.Configuration;
-import org.apache.flink.streaming.api.functions.windowing.ReduceAllWindowFunction;
+import org.apache.flink.streaming.api.functions.windowing.ReduceIterableAllWindowFunction;
 import org.apache.flink.streaming.api.watermark.Watermark;
 import org.apache.flink.streaming.api.windowing.assigners.GlobalWindows;
 import org.apache.flink.streaming.api.windowing.evictors.CountEvictor;
@@ -56,7 +55,7 @@ public class EvictingNonKeyedWindowOperatorTest {
 				GlobalWindows.create(),
 				new GlobalWindow.Serializer(),
 				new HeapWindowBuffer.Factory<Tuple2<String, Integer>>(),
-				new ReduceAllWindowFunction<GlobalWindow, Tuple2<String, Integer>>(new SumReducer(closeCalled)),
+				new ReduceIterableAllWindowFunction<GlobalWindow, Tuple2<String, Integer>>(new SumReducer()),
 				CountTrigger.of(WINDOW_SLIDE),
 				CountEvictor.of(WINDOW_SIZE));
 
@@ -96,10 +95,6 @@ public class EvictingNonKeyedWindowOperatorTest {
 		TestHarnessUtil.assertOutputEqualsSorted("Output was not correct.", expectedOutput, testHarness.getOutput(), new ResultSortComparator());
 
 		testHarness.close();
-
-		Assert.assertEquals("Close was not called.", 1, closeCalled.get());
-
-
 	}
 
 	// ------------------------------------------------------------------------
@@ -109,32 +104,9 @@ public class EvictingNonKeyedWindowOperatorTest {
 	public static class SumReducer extends RichReduceFunction<Tuple2<String, Integer>> {
 		private static final long serialVersionUID = 1L;
 
-		private boolean openCalled = false;
-
-		private  AtomicInteger closeCalled;
-
-		public SumReducer(AtomicInteger closeCalled) {
-			this.closeCalled = closeCalled;
-		}
-
-		@Override
-		public void open(Configuration parameters) throws Exception {
-			super.open(parameters);
-			openCalled = true;
-		}
-
-		@Override
-		public void close() throws Exception {
-			super.close();
-			closeCalled.incrementAndGet();
-		}
-
 		@Override
 		public Tuple2<String, Integer> reduce(Tuple2<String, Integer> value1,
 				Tuple2<String, Integer> value2) throws Exception {
-			if (!openCalled) {
-				Assert.fail("Open was not called");
-			}
 			return new Tuple2<>(value2.f0, value1.f1 + value2.f1);
 		}
 	}

http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingWindowOperatorTest.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingWindowOperatorTest.java b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingWindowOperatorTest.java
index 1821308..2f1dce5 100644
--- a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingWindowOperatorTest.java
+++ b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingWindowOperatorTest.java
@@ -18,22 +18,27 @@
 package org.apache.flink.streaming.runtime.operators.windowing;
 
 import org.apache.flink.api.common.ExecutionConfig;
-import org.apache.flink.api.common.functions.RichReduceFunction;
+import org.apache.flink.api.common.functions.ReduceFunction;
+import org.apache.flink.api.common.state.ListStateDescriptor;
 import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
 import org.apache.flink.api.java.functions.KeySelector;
 import org.apache.flink.api.java.tuple.Tuple2;
 import org.apache.flink.api.java.typeutils.TypeInfoParser;
 import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.functions.windowing.ReduceIterableWindowFunction;
+import org.apache.flink.streaming.api.functions.windowing.RichWindowFunction;
 import org.apache.flink.streaming.api.watermark.Watermark;
 import org.apache.flink.streaming.api.windowing.assigners.GlobalWindows;
-import org.apache.flink.streaming.runtime.operators.windowing.buffers.HeapWindowBuffer;
 import org.apache.flink.streaming.api.windowing.evictors.CountEvictor;
-import org.apache.flink.streaming.api.functions.windowing.ReduceWindowFunction;
 import org.apache.flink.streaming.api.windowing.triggers.CountTrigger;
 import org.apache.flink.streaming.api.windowing.windows.GlobalWindow;
+import org.apache.flink.streaming.api.windowing.windows.Window;
 import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer;
 import org.apache.flink.streaming.util.OneInputStreamOperatorTestHarness;
 import org.apache.flink.streaming.util.TestHarnessUtil;
+import org.apache.flink.util.Collector;
 import org.junit.Assert;
 import org.junit.Test;
 
@@ -48,27 +53,35 @@ public class EvictingWindowOperatorTest {
 	@Test
 	@SuppressWarnings("unchecked")
 	public void testCountTrigger() throws Exception {
-		AtomicInteger closeCalled = new AtomicInteger(0);
 
 		final int WINDOW_SIZE = 4;
 		final int WINDOW_SLIDE = 2;
 
+		TypeInformation<Tuple2<String, Integer>> inputType = TypeInfoParser.parse("Tuple2<String, Integer>");
+
+
+		ListStateDescriptor<StreamRecord<Tuple2<String, Integer>>> stateDesc = new ListStateDescriptor<>("window-contents",
+			new StreamRecordSerializer<>(inputType.createSerializer(new ExecutionConfig())));
+
+
 		EvictingWindowOperator<String, Tuple2<String, Integer>, Tuple2<String, Integer>, GlobalWindow> operator = new EvictingWindowOperator<>(
 				GlobalWindows.create(),
 				new GlobalWindow.Serializer(),
 				new TupleKeySelector(),
 				BasicTypeInfo.STRING_TYPE_INFO.createSerializer(new ExecutionConfig()),
-				new HeapWindowBuffer.Factory<Tuple2<String, Integer>>(),
-				new ReduceWindowFunction<String, GlobalWindow, Tuple2<String, Integer>>(new SumReducer(closeCalled)),
+				stateDesc,
+				new ReduceIterableWindowFunction<String, GlobalWindow, Tuple2<String, Integer>>(new SumReducer()),
 				CountTrigger.of(WINDOW_SLIDE),
 				CountEvictor.of(WINDOW_SIZE));
 
-		operator.setInputType(TypeInfoParser.<Tuple2<String, Integer>>parse("Tuple2<String, Integer>"), new ExecutionConfig());
+		operator.setInputType(inputType, new ExecutionConfig());
 
 
 		OneInputStreamOperatorTestHarness<Tuple2<String, Integer>, Tuple2<String, Integer>> testHarness =
 				new OneInputStreamOperatorTestHarness<>(operator);
 
+		testHarness.configureForKeyedStream(new TupleKeySelector(), BasicTypeInfo.STRING_TYPE_INFO);
+
 		long initialTime = 0L;
 		ConcurrentLinkedQueue<Object> expectedOutput = new ConcurrentLinkedQueue<>();
 
@@ -105,24 +118,104 @@ public class EvictingWindowOperatorTest {
 		TestHarnessUtil.assertOutputEqualsSorted("Output was not correct.", expectedOutput, testHarness.getOutput(), new ResultSortComparator());
 
 		testHarness.close();
+	}
 
-		Assert.assertEquals("Close was not called.", 1, closeCalled.get());
+	@Test
+	@SuppressWarnings("unchecked")
+	public void testCountTriggerWithApply() throws Exception {
+		AtomicInteger closeCalled = new AtomicInteger(0);
+
+		final int WINDOW_SIZE = 4;
+		final int WINDOW_SLIDE = 2;
+
+		TypeInformation<Tuple2<String, Integer>> inputType = TypeInfoParser.parse("Tuple2<String, Integer>");
+
+
+		ListStateDescriptor<StreamRecord<Tuple2<String, Integer>>> stateDesc = new ListStateDescriptor<>("window-contents",
+			new StreamRecordSerializer<>(inputType.createSerializer(new ExecutionConfig())));
+
+
+		EvictingWindowOperator<String, Tuple2<String, Integer>, Tuple2<String, Integer>, GlobalWindow> operator = new EvictingWindowOperator<>(
+			GlobalWindows.create(),
+			new GlobalWindow.Serializer(),
+			new TupleKeySelector(),
+			BasicTypeInfo.STRING_TYPE_INFO.createSerializer(new ExecutionConfig()),
+			stateDesc,
+			new RichSumReducer<GlobalWindow>(closeCalled),
+			CountTrigger.of(WINDOW_SLIDE),
+			CountEvictor.of(WINDOW_SIZE));
+
+		operator.setInputType(inputType, new ExecutionConfig());
+
+
+		OneInputStreamOperatorTestHarness<Tuple2<String, Integer>, Tuple2<String, Integer>> testHarness =
+			new OneInputStreamOperatorTestHarness<>(operator);
+
+		testHarness.configureForKeyedStream(new TupleKeySelector(), BasicTypeInfo.STRING_TYPE_INFO);
+
+		long initialTime = 0L;
+		ConcurrentLinkedQueue<Object> expectedOutput = new ConcurrentLinkedQueue<>();
+
+		testHarness.open();
+
+		// The global window actually ignores these timestamps...
+
+		// add elements out-of-order
+		testHarness.processElement(new StreamRecord<>(new Tuple2<>("key2", 1), initialTime + 3000));
+		testHarness.processElement(new StreamRecord<>(new Tuple2<>("key2", 1), initialTime + 3999));
+
+		testHarness.processElement(new StreamRecord<>(new Tuple2<>("key1", 1), initialTime + 20));
+		testHarness.processElement(new StreamRecord<>(new Tuple2<>("key1", 1), initialTime));
+		testHarness.processElement(new StreamRecord<>(new Tuple2<>("key1", 1), initialTime + 999));
 
+		testHarness.processElement(new StreamRecord<>(new Tuple2<>("key2", 1), initialTime + 1998));
+		testHarness.processElement(new StreamRecord<>(new Tuple2<>("key2", 1), initialTime + 1999));
+		testHarness.processElement(new StreamRecord<>(new Tuple2<>("key2", 1), initialTime + 1000));
+
+
+
+		expectedOutput.add(new StreamRecord<>(new Tuple2<>("key2", 2), Long.MAX_VALUE));
+		expectedOutput.add(new StreamRecord<>(new Tuple2<>("key2", 4), Long.MAX_VALUE));
+		expectedOutput.add(new StreamRecord<>(new Tuple2<>("key1", 2), Long.MAX_VALUE));
+
+		TestHarnessUtil.assertOutputEqualsSorted("Output was not correct.", expectedOutput, testHarness.getOutput(), new ResultSortComparator());
+
+		testHarness.processElement(new StreamRecord<>(new Tuple2<>("key1", 1), initialTime + 10999));
+		testHarness.processElement(new StreamRecord<>(new Tuple2<>("key2", 1), initialTime + 1000));
+
+		expectedOutput.add(new StreamRecord<>(new Tuple2<>("key1", 4), Long.MAX_VALUE));
+		expectedOutput.add(new StreamRecord<>(new Tuple2<>("key2", 4), Long.MAX_VALUE));
+
+		TestHarnessUtil.assertOutputEqualsSorted("Output was not correct.", expectedOutput, testHarness.getOutput(), new ResultSortComparator());
+
+		testHarness.close();
 
+		Assert.assertEquals("Close was not called.", 1, closeCalled.get());
 	}
 
 	// ------------------------------------------------------------------------
 	//  UDFs
 	// ------------------------------------------------------------------------
 
-	public static class SumReducer extends RichReduceFunction<Tuple2<String, Integer>> {
+	public static class SumReducer implements ReduceFunction<Tuple2<String, Integer>> {
+		private static final long serialVersionUID = 1L;
+
+
+		@Override
+		public Tuple2<String, Integer> reduce(Tuple2<String, Integer> value1,
+				Tuple2<String, Integer> value2) throws Exception {
+			return new Tuple2<>(value2.f0, value1.f1 + value2.f1);
+		}
+	}
+
+	public static class RichSumReducer<W extends Window> extends RichWindowFunction<Iterable<Tuple2<String, Integer>>, Tuple2<String, Integer>, String, W> {
 		private static final long serialVersionUID = 1L;
 
 		private boolean openCalled = false;
 
-		private  AtomicInteger closeCalled;
+		private AtomicInteger closeCalled = new AtomicInteger(0);
 
-		public SumReducer(AtomicInteger closeCalled) {
+		public RichSumReducer(AtomicInteger closeCalled) {
 			this.closeCalled = closeCalled;
 		}
 
@@ -139,13 +232,23 @@ public class EvictingWindowOperatorTest {
 		}
 
 		@Override
-		public Tuple2<String, Integer> reduce(Tuple2<String, Integer> value1,
-				Tuple2<String, Integer> value2) throws Exception {
+		public void apply(String key,
+			W window,
+			Iterable<Tuple2<String, Integer>> input,
+			Collector<Tuple2<String, Integer>> out) throws Exception {
+
 			if (!openCalled) {
 				Assert.fail("Open was not called");
 			}
-			return new Tuple2<>(value2.f0, value1.f1 + value2.f1);
+			int sum = 0;
+
+			for (Tuple2<String, Integer> t: input) {
+				sum += t.f1;
+			}
+			out.collect(new Tuple2<>(key, sum));
+
 		}
+
 	}
 
 	@SuppressWarnings("unchecked")

http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/NonKeyedWindowOperatorTest.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/NonKeyedWindowOperatorTest.java b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/NonKeyedWindowOperatorTest.java
index 02e032a..c0e6ad4 100644
--- a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/NonKeyedWindowOperatorTest.java
+++ b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/NonKeyedWindowOperatorTest.java
@@ -18,11 +18,12 @@
 package org.apache.flink.streaming.runtime.operators.windowing;
 
 import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.functions.ReduceFunction;
 import org.apache.flink.api.common.functions.RichReduceFunction;
 import org.apache.flink.api.java.tuple.Tuple2;
 import org.apache.flink.api.java.typeutils.TypeInfoParser;
 import org.apache.flink.configuration.Configuration;
-import org.apache.flink.streaming.api.functions.windowing.ReduceAllWindowFunction;
+import org.apache.flink.streaming.api.functions.windowing.ReduceIterableAllWindowFunction;
 import org.apache.flink.streaming.api.watermark.Watermark;
 import org.apache.flink.streaming.api.windowing.assigners.GlobalWindows;
 import org.apache.flink.streaming.api.windowing.assigners.SlidingTimeWindows;
@@ -77,7 +78,7 @@ public class NonKeyedWindowOperatorTest {
 				SlidingTimeWindows.of(Time.of(WINDOW_SIZE, TimeUnit.SECONDS), Time.of(WINDOW_SLIDE, TimeUnit.SECONDS)),
 				new TimeWindow.Serializer(),
 				windowBufferFactory,
-				new ReduceAllWindowFunction<TimeWindow, Tuple2<String, Integer>>(new SumReducer()),
+				new ReduceIterableAllWindowFunction<TimeWindow, Tuple2<String, Integer>>(new SumReducer()),
 				EventTimeTrigger.create());
 
 		operator.setInputType(TypeInfoParser.<Tuple2<String, Integer>>parse("Tuple2<String, Integer>"), new ExecutionConfig());
@@ -140,11 +141,6 @@ public class NonKeyedWindowOperatorTest {
 		TestHarnessUtil.assertOutputEqualsSorted("Output was not correct.", expectedOutput, testHarness.getOutput(), new ResultSortComparator());
 
 		testHarness.close();
-		if (windowBufferFactory instanceof PreAggregatingHeapWindowBuffer.Factory) {
-			Assert.assertEquals("Close was not called.", 2, closeCalled.get());
-		} else {
-			Assert.assertEquals("Close was not called.", 1, closeCalled.get());
-		}
 	}
 
 	@Test
@@ -158,7 +154,7 @@ public class NonKeyedWindowOperatorTest {
 				TumblingTimeWindows.of(Time.of(WINDOW_SIZE, TimeUnit.SECONDS)),
 				new TimeWindow.Serializer(),
 				windowBufferFactory,
-				new ReduceAllWindowFunction<TimeWindow, Tuple2<String, Integer>>(new SumReducer()),
+				new ReduceIterableAllWindowFunction<TimeWindow, Tuple2<String, Integer>>(new SumReducer()),
 				EventTimeTrigger.create());
 
 		operator.setInputType(TypeInfoParser.<Tuple2<String, Integer>>parse("Tuple2<String, Integer>"), new ExecutionConfig());
@@ -219,11 +215,6 @@ public class NonKeyedWindowOperatorTest {
 		TestHarnessUtil.assertOutputEqualsSorted("Output was not correct.", expectedOutput, testHarness.getOutput(), new ResultSortComparator());
 
 		testHarness.close();
-		if (windowBufferFactory instanceof PreAggregatingHeapWindowBuffer.Factory) {
-			Assert.assertEquals("Close was not called.", 2, closeCalled.get());
-		} else {
-			Assert.assertEquals("Close was not called.", 1, closeCalled.get());
-		}
 	}
 
 	@Test
@@ -237,7 +228,7 @@ public class NonKeyedWindowOperatorTest {
 				GlobalWindows.create(),
 				new GlobalWindow.Serializer(),
 				windowBufferFactory,
-				new ReduceAllWindowFunction<GlobalWindow, Tuple2<String, Integer>>(new SumReducer()),
+				new ReduceIterableAllWindowFunction<GlobalWindow, Tuple2<String, Integer>>(new SumReducer()),
 				ContinuousEventTimeTrigger.of(Time.of(WINDOW_SIZE, TimeUnit.SECONDS)));
 
 		operator.setInputType(TypeInfoParser.<Tuple2<String, Integer>>parse("Tuple2<String, Integer>"), new ExecutionConfig());
@@ -298,11 +289,6 @@ public class NonKeyedWindowOperatorTest {
 		TestHarnessUtil.assertOutputEqualsSorted("Output was not correct.", expectedOutput, testHarness.getOutput(), new ResultSortComparator());
 
 		testHarness.close();
-		if (windowBufferFactory instanceof PreAggregatingHeapWindowBuffer.Factory) {
-			Assert.assertEquals("Close was not called.", 2, closeCalled.get());
-		} else {
-			Assert.assertEquals("Close was not called.", 1, closeCalled.get());
-		}
 	}
 
 	@Test
@@ -316,7 +302,7 @@ public class NonKeyedWindowOperatorTest {
 				GlobalWindows.create(),
 				new GlobalWindow.Serializer(),
 				windowBufferFactory,
-				new ReduceAllWindowFunction<GlobalWindow, Tuple2<String, Integer>>(new SumReducer()),
+				new ReduceIterableAllWindowFunction<GlobalWindow, Tuple2<String, Integer>>(new SumReducer()),
 				PurgingTrigger.of(CountTrigger.of(WINDOW_SIZE)));
 
 		operator.setInputType(TypeInfoParser.<Tuple2<String, Integer>>parse(
@@ -355,19 +341,23 @@ public class NonKeyedWindowOperatorTest {
 		TestHarnessUtil.assertOutputEqualsSorted("Output was not correct.", expectedOutput, testHarness.getOutput(), new ResultSortComparator());
 
 		testHarness.close();
-		if (windowBufferFactory instanceof PreAggregatingHeapWindowBuffer.Factory) {
-			Assert.assertEquals("Close was not called.", 2, closeCalled.get());
-		} else {
-			Assert.assertEquals("Close was not called.", 1, closeCalled.get());
-		}
-
 	}
 
 	// ------------------------------------------------------------------------
 	//  UDFs
 	// ------------------------------------------------------------------------
 
-	public static class SumReducer extends RichReduceFunction<Tuple2<String, Integer>> {
+	public static class SumReducer implements ReduceFunction<Tuple2<String, Integer>> {
+		private static final long serialVersionUID = 1L;
+
+		@Override
+		public Tuple2<String, Integer> reduce(Tuple2<String, Integer> value1,
+			Tuple2<String, Integer> value2) throws Exception {
+			return new Tuple2<>(value2.f0, value1.f1 + value2.f1);
+		}
+	}
+
+	public static class RichSumReducer extends RichReduceFunction<Tuple2<String, Integer>> {
 		private static final long serialVersionUID = 1L;
 
 		private boolean openCalled = false;
@@ -400,7 +390,7 @@ public class NonKeyedWindowOperatorTest {
 	@Parameterized.Parameters(name = "WindowBuffer = {0}")
 	@SuppressWarnings("unchecked,rawtypes")
 	public static Collection<WindowBufferFactory[]> windowBuffers(){
-		return Arrays.asList(new WindowBufferFactory[]{new PreAggregatingHeapWindowBuffer.Factory(new SumReducer())},
+		return Arrays.asList(new WindowBufferFactory[]{new PreAggregatingHeapWindowBuffer.Factory(new RichSumReducer())},
 				new WindowBufferFactory[]{new HeapWindowBuffer.Factory()}
 				);
 	}

http://git-wip-us.apache.org/repos/asf/flink/blob/67ca4a43/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/TimeWindowTranslationTest.java
----------------------------------------------------------------------
diff --git a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/TimeWindowTranslationTest.java b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/TimeWindowTranslationTest.java
index 76c6f20..b99232a 100644
--- a/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/TimeWindowTranslationTest.java
+++ b/flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/TimeWindowTranslationTest.java
@@ -17,7 +17,7 @@
  */
 package org.apache.flink.streaming.runtime.operators.windowing;
 
-import org.apache.flink.api.common.functions.RichReduceFunction;
+import org.apache.flink.api.common.functions.ReduceFunction;
 import org.apache.flink.api.java.tuple.Tuple;
 import org.apache.flink.api.java.tuple.Tuple2;
 import org.apache.flink.streaming.api.datastream.DataStream;
@@ -68,7 +68,7 @@ public class TimeWindowTranslationTest extends StreamingMultipleProgramsTestBase
 		DataStream<Tuple2<String, Integer>> window2 = source
 				.keyBy(0)
 				.timeWindow(Time.of(1000, TimeUnit.MILLISECONDS))
-				.apply(new WindowFunction<Tuple2<String, Integer>, Tuple2<String, Integer>, Tuple, TimeWindow>() {
+				.apply(new WindowFunction<Iterable<Tuple2<String, Integer>>, Tuple2<String, Integer>, Tuple, TimeWindow>() {
 					private static final long serialVersionUID = 1L;
 
 					@Override
@@ -111,7 +111,7 @@ public class TimeWindowTranslationTest extends StreamingMultipleProgramsTestBase
 
 		DataStream<Tuple2<String, Integer>> window2 = source
 				.timeWindowAll(Time.of(1000, TimeUnit.MILLISECONDS))
-				.apply(new AllWindowFunction<Tuple2<String, Integer>, Tuple2<String, Integer>, TimeWindow>() {
+				.apply(new AllWindowFunction<Iterable<Tuple2<String, Integer>>, Tuple2<String, Integer>, TimeWindow>() {
 					private static final long serialVersionUID = 1L;
 
 					@Override
@@ -132,7 +132,7 @@ public class TimeWindowTranslationTest extends StreamingMultipleProgramsTestBase
 	//  UDFs
 	// ------------------------------------------------------------------------
 
-	public static class DummyReducer extends RichReduceFunction<Tuple2<String, Integer>> {
+	public static class DummyReducer implements ReduceFunction<Tuple2<String, Integer>> {
 		private static final long serialVersionUID = 1L;
 
 		@Override


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