[jira] [Created] (FLINK-1238) Add a way to deactivate the "mutable object safe mode"

["Stephan Ewen (JIRA)" <ji...@apache.org>]

Stephan Ewen created FLINK-1238:
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             Summary: Add a way to deactivate the "mutable object safe mode"
                 Key: FLINK-1238
                 URL: https://issues.apache.org/jira/browse/FLINK-1238
             Project: Flink
          Issue Type: Bug
          Components: Local Runtime
    Affects Versions: 0.8-incubating
            Reporter: Stephan Ewen
            Priority: Minor
             Fix For: 0.8-incubating


Currently, the runtime operators for Join and Cross operate in a safe mode concerning objects:

Whenever a cross or join function is called with the same object more than once (for cross always, for join in all but the 1:1 join cases), the runtime makes deep copies of the objects before calling the join function.

Even if the join function modifies the objects that were given into the function, the next call to the function will pass the original unmodified value. It is a safe mode for programmers that operate more in a Hadoop-ish way, were it was very common to modify the objects rather than creating new ones.

I would add an option to disable that mode, as it does cost performance. 



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