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Posted to user@flink.apache.org by M Singh <ma...@yahoo.com> on 2017/11/18 16:28:52 UTC

Apache Flink - Evictor interface clarification

Hi:
I am looking at the documentation and it states:
'The evictor has the ability to remove elements from a window after the trigger fires and before and/or after the window function is applied. '
I understand that if we use evictor's before method (evictBefore) it can remove items before invocation of the window computation.  But I am not sure what is the use of the evictor's after method (evictAfter) ?  
Please let me know where I can find information about what are the use cases for evictor's after method (evictorAfter).
Thanks
Mans

Re: Apache Flink - Evictor interface clarification

Posted by M Singh <ma...@yahoo.com>.

Thanks Vishu for the pointer. 

    On Saturday, November 18, 2017 6:27 PM, Vishnu Viswanath <vi...@gmail.com> wrote:
 

 Hi Mans,
Have a look at this: http://apache-flink- mailing-list-archive.1008284. n3.nabble.com/DISCUSS-Enhance- Window-Evictor-in-Flink- tp12406p12442.html
Thanks,Vishnu
On Sat, Nov 18, 2017 at 11:28 AM, M Singh <ma...@yahoo.com> wrote:

Hi:
I am looking at the documentation and it states:
'The evictor has the ability to remove elements from a window after the trigger fires and before and/or after the window function is applied. '
I understand that if we use evictor's before method (evictBefore) it can remove items before invocation of the window computation.  But I am not sure what is the use of the evictor's after method (evictAfter) ?  
Please let me know where I can find information about what are the use cases for evictor's after method (evictorAfter).
Thanks
Mans

Re: Apache Flink - Evictor interface clarification

Posted by Vishnu Viswanath <vi...@gmail.com>.

Hi Mans,

Have a look at this: http://apache-flink-mailing-list-archive.1008284.
n3.nabble.com/DISCUSS-Enhance-Window-Evictor-in-Flink-tp12406p12442.html

Thanks,
Vishnu <http://vishnuviswanath.com>

On Sat, Nov 18, 2017 at 11:28 AM, M Singh <ma...@yahoo.com> wrote:

> Hi:
>
> I am looking at the documentation and it states:
>
> 'The evictor has the ability to remove elements from a window *after* the
> trigger fires and *before and/or after* the window function is applied. '
>
> I understand that if we use evictor's before method (evictBefore) it can
> remove items before invocation of the window computation.  But I am not
> sure what is the use of the evictor's after method (evictAfter) ?
>
> Please let me know where I can find information about what are the use
> cases for evictor's after method (evictorAfter).
>
> Thanks
>
> Mans
>