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https://issues.apache.org/jira/browse/FLINK-1977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14532712#comment-14532712
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ASF GitHub Bot commented on FLINK-1977:
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Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/flink/pull/659#discussion_r29855265
--- Diff:
flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/GroupedReduceTest.java
---
@@ -23,6 +23,7 @@
import java.util.List;
import org.apache.flink.api.common.functions.ReduceFunction;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
--- End diff --
Unused import? (checkstyle doesn't test tests ;) )
> 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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