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From vinay patil <vinay18.pa...@gmail.com>
Subject Re: Regarding Late Elements
Date Tue, 04 Oct 2016 16:52:59 GMT
Yes Kostas, thank you for the explanation , I will take a look

Regards,
Vinay Patil

On Tue, Oct 4, 2016 at 11:23 AM, Kostas Kloudas [via Apache Flink User
Mailing List archive.] <ml-node+s2336050n9332h44@n4.nabble.com> wrote:

> Hi Vinay,
>
> These methods are useful when using your trigger with SessionWindows. When
> using session windows,
> the state of a window and that of the corresponding trigger has to be
> merged with that of other windows.
>
> These methods do exactly that: the canMerge() says if the trigger can be
> used with Session Windows, and if yes,
> the onMerge() includes the logic of what to do with the trigger state when
> a window merging happens.
>
> As an example you can check out the CountTrigger.
>
> I hope this answers your question.
>
> Cheers,
> Kostas
>
> On Oct 4, 2016, at 6:10 PM, vinay patil <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=9332&i=0>> wrote:
>
> Hi Kostas,
>
> Yes you are right , I am always doing  FIRE_AND_PURGE , if we don't do
> this and only use FIRE , the window function will get the elements
> in incremental fashion (1, 2,3..so on)
> I had observed this while testing.
>
> Can you please explain me the importance of canMerge and onMerge functions
> in trigger, from the javadocs I got it on a high level, but not able to
> understand it correctly (so I am not using these functions for now in
> Custom Trigger).
>
> Regards,
> Vinay Patil
>
> On Tue, Oct 4, 2016 at 10:51 AM, Kostas Kloudas [via Apache Flink User
> Mailing List archive.] <<a href="x-msg://14/user/
> SendEmail.jtp?type=node&amp;node=9331&amp;i=0" target="_top"
> rel="nofollow" link="external" class="">[hidden email]> wrote:
>
>> Hi Vinay,
>>
>> By setting the allowed_lateness to LongMax you are ok.
>> Sorry I forgot that this was the default value.
>>
>> Just a note (although you have it right in your code), in this case
>> you should always FIRE_AND_PURGE and not just FIRE. In other
>> case your state will keep growing as it is never garbage collected.
>>
>> Cheers,
>> Kostas
>>
>>
>> On Oct 4, 2016, at 5:42 PM, vinay patil <[hidden email]
>> <http://user/SendEmail.jtp?type=node&node=9329&i=0>> wrote:
>>
>> Long.MAX_VALUE
>>
>>
>>
>>
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