Gyula Fora created FLINK-2281:
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Summary: 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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