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https://issues.apache.org/jira/browse/FLINK-1977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14532718#comment-14532718
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ASF GitHub Bot commented on FLINK-1977:
---------------------------------------

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

    https://github.com/apache/flink/pull/659#discussion_r29855517
  
    --- Diff: 
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/runtime/tasks/TwoInputStreamTask.java
 ---
    @@ -24,56 +24,110 @@
     import org.apache.flink.runtime.io.network.partition.consumer.InputGate;
     import org.apache.flink.runtime.plugable.DeserializationDelegate;
     import org.apache.flink.streaming.api.graph.StreamEdge;
    +import org.apache.flink.streaming.api.operators.TwoInputStreamOperator;
     import org.apache.flink.streaming.runtime.io.CoReaderIterator;
     import org.apache.flink.streaming.runtime.io.CoRecordReader;
    -import org.apache.flink.streaming.runtime.io.IndexedReaderIterator;
     import org.apache.flink.streaming.runtime.io.InputGateFactory;
     import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
     import 
org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer;
    -import org.apache.flink.util.MutableObjectIterator;
    +import org.apache.flink.util.StringUtils;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
     
    -public class CoStreamTask<IN1, IN2, OUT> extends StreamTask<IN1, OUT> {
    +public class TwoInputStreamTask<IN1, IN2, OUT> extends StreamTask<OUT, 
TwoInputStreamOperator<IN1, IN2, OUT>> {
    +
    --- End diff --
    
    I like CoStreamTask as a name.


> Rework Stream Operators to always be push based
> -----------------------------------------------
>
>                 Key: FLINK-1977
>                 URL: https://issues.apache.org/jira/browse/FLINK-1977
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>
> This is a result of the discussion on the mailing list. This is an excerpt 
> from the mailing list that gives the basic idea of the change:
> I propose to change all streaming operators to be push based, with a
> slightly improved interface: In addition to collect(), which I would
> call receiveElement() I would add receivePunctuation() and
> receiveBarrier(). The first operator in the chain would also get data
> from the outside invokable that reads from the input iterator and
> calls receiveElement() for the first operator in a chain.



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