ASF GitHub Bot commented on FLINK-8571:

Github user aljoscha commented on a diff in the pull request:

    --- Diff: 
    @@ -0,0 +1,233 @@
    + * 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.functions.ReduceFunction;
    +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.configuration.Configuration;
    +import org.apache.flink.streaming.api.TimeCharacteristic;
    +import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
    +import org.apache.flink.streaming.api.windowing.time.Time;
    +import org.apache.flink.util.Preconditions;
    +import org.junit.Assert;
    +import org.junit.Rule;
    +import org.junit.Test;
    +import org.junit.rules.TemporaryFolder;
    +import java.io.BufferedInputStream;
    +import java.io.BufferedOutputStream;
    +import java.io.DataInputStream;
    +import java.io.DataOutputStream;
    +import java.io.EOFException;
    +import java.io.File;
    +import java.io.FileInputStream;
    +import java.io.FileOutputStream;
    +import java.util.ArrayList;
    +import java.util.List;
    +import java.util.Random;
    + * Tests for {@link DataStreamUtils}.
    + */
    +public class DataStreamUtilsTest {
    --- End diff --
    I think this should be an `ITCase` since we actually run a complete Flink 

> Provide an enhanced KeyedStream implementation to use ForwardPartitioner
> ------------------------------------------------------------------------
>                 Key: FLINK-8571
>                 URL: https://issues.apache.org/jira/browse/FLINK-8571
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Nagarjun Guraja
>            Assignee: Stefan Richter
>            Priority: Major
> This enhancement would help in modeling problems with pre partitioned input 
> sources(for e.g. Kafka with Keyed topics). This would help in making the job 
> graph embarrassingly parallel while leveraging rocksdb state backend and also 
> the fine grained recovery semantics.

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