Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/747#discussion_r33129995
--- Diff:
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/datastream/KeyedDataStream.java
---
@@ -0,0 +1,78 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.api.datastream;
+
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.streaming.api.operators.OneInputStreamOperator;
+import org.apache.flink.streaming.runtime.partitioner.StreamPartitioner;
+
+/**
+ * A KeyedDataStream represents a {@link DataStream} on which operator
state is
+ * partitioned by key using a provided {@link KeySelector}. Usual
DataStream
+ * operations on KeyedDataStreams as with simple DataStreams with the
exception
+ * of partitioning methods such as shuffle, forward and groupBy.
--- End diff --
I don't get what this explanation is trying to say.
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