[jira] [Updated] (FLINK-1137) Add a way to switch between mutable object safe mode and efficient object reuse mode

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

     [ https://issues.apache.org/jira/browse/FLINK-1137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephan Ewen updated FLINK-1137:
--------------------------------
    Summary: Add a way to switch between mutable object safe mode and efficient object reuse mode  (was: Add a way to configure mutable object safe mode versus object reuse )

> Add a way to switch between mutable object safe mode and efficient object reuse mode
> ------------------------------------------------------------------------------------
>
>                 Key: FLINK-1137
>                 URL: https://issues.apache.org/jira/browse/FLINK-1137
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Stephan Ewen
>            Priority: Minor
>
> Right now, Flink is conservative and takes precautions with respect to mutable objects. Neither the modifying of objects that are input to UDFs, nor modifying objects that are returned, will cause wrong results.
> This incurs a certain overhead for some operators. Most operators have a way to avoid that.
> I propose an optional switch to allow to set the system to a mode where it avoids those precautions, for the sake of efficiency.



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