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https://issues.apache.org/jira/browse/FLINK-2281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14605261#comment-14605261
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Stephan Ewen commented on FLINK-2281:
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Nice idea, but probably not very critical.
I would assume that most real-world connected inputs involve some repartition
patterns anyways.
> Allow chaining of operators with multiple inputs
> ------------------------------------------------
>
> Key: FLINK-2281
> URL: https://issues.apache.org/jira/browse/FLINK-2281
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Reporter: Gyula Fora
> Assignee: Gyula Fora
> Priority: Minor
>
> Currently only operators with one input can be chained for better
> performance. In principle there is no reason why this should not be extended
> to multiple input operators (where chaining is applicable, i.e forward
> connected), to allow maximal speedup.
> The concern usually arises that it might not be good to always chain
> everything in case of computation heavy operators. In these cases (if the job
> is otherwise viable) chaining only increases latency for some operations
> while the throughput is increased exploiting by increasing the parallelism to
> the freed resources.
> In any case chaining should still remain tunable on an operator level.
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