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Posted to issues@flink.apache.org by "Stephan Ewen (JIRA)" <ji...@apache.org> on 2016/01/18 18:38:39 UTC

[jira] [Created] (FLINK-3255) Chaining behavior should not depend on parallelism

Stephan Ewen created FLINK-3255:
-----------------------------------

             Summary: Chaining behavior should not depend on parallelism
                 Key: FLINK-3255
                 URL: https://issues.apache.org/jira/browse/FLINK-3255
             Project: Flink
          Issue Type: Bug
          Components: Streaming
    Affects Versions: 1.0.0
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 0.10.1


Currently, operators are chained more aggressively when the parallelism is one. That makes debugging tougher as it changes threading behavior.

The benefits are also limited: Real installations where that type of efficiency would be needed would not run in parallelism 1, or would not use a partitioning/broadcast step there (if explicitly required to run parallelism 1).

In the future, when we want to allow parallelism to be adjusted dynamically, this will be even more tricky.



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