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

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek reassigned FLINK-1238:
---------------------------------------

    Assignee: Aljoscha Krettek

> 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: Improvement
>          Components: Local Runtime
>    Affects Versions: 0.8-incubating
>            Reporter: Stephan Ewen
>            Assignee: Aljoscha Krettek
>            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. 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)