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https://issues.apache.org/jira/browse/FLINK-1977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14532652#comment-14532652
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ASF GitHub Bot commented on FLINK-1977:
---------------------------------------

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

    https://github.com/apache/flink/pull/659#discussion_r29852972
  
    --- Diff: 
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/functions/source/FileSourceFunction.java
 ---
    @@ -46,39 +51,25 @@ public FileSourceFunction(InputFormat<String, ?> 
format, TypeInformation<String>
        }
     
        @Override
    +   @SuppressWarnings("unchecked")
        public void open(Configuration parameters) throws Exception {
                StreamingRuntimeContext context = (StreamingRuntimeContext) 
getRuntimeContext();
                this.provider = context.getInputSplitProvider();
                inputFormat.configure(context.getTaskStubParameters());
    +           serializer = 
typeInfo.createSerializer(getRuntimeContext().getExecutionConfig());
    --- End diff --
    
    But the code was like this before my change. Then we should work on getting 
a proper ExecutionConfig over to runtime.


> 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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