Re: Apache Flink - Manipulating the state of an object in an evictor or trigger

[M Singh]

 Biao:
I am asking this question, just to understand the impact and best practices 
around it.  The state I am referring to it the objects that are passed to 
evictor.
https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/operators/windows.html#evictors

void evictBefore(Iterable> elements, int size, W window, 
EvictorContext evictorContext);
And you are right, I also don't see this in this information in the docs.  That 
is the reason I wanted to find out.
Thanks again for your time.
Mans  
On Friday, July 19, 2019, 02:15:02 AM EDT, Biao Liu  
wrote:  
 
 Hi,
I don't find any official document about it.
There are several state relevant methods in `TriggerContext`. I believe it's 
absolutely safe to use state in `Trigger` through `TriggerContext`.
Regarding to `Evictor`, there is no such methods in `EvictorContext`. After 
taking a glance on relevant codes, I guess it's OK for now. But I suggest do 
not manipulate state in `Evictor` until there is an official guarantee.
BTW, I'm just wondering why do you want to manipulate state in `Evictor`? If 
your requirement is reasonable, maybe we could support it officially.

M Singh  于2019年7月14日周日 下午9:07写道：

Hi:
Is it safe to manipulate the state of an object in the evictor or trigger ?  
Are there any best practices/dos and don't on this ?
Thanks
  

Re: Apache Flink - Manipulating the state of an object in an evictor or trigger

[Biao Liu]

Hi,

I don't find any official document about it.

There are several state relevant methods in `TriggerContext`. I believe
it's absolutely safe to use state in `Trigger` through `TriggerContext`.

Regarding to `Evictor`, there is no such methods in `EvictorContext`. After
taking a glance on relevant codes, I guess it's OK for now. But I suggest
do not manipulate state in `Evictor` until there is an official guarantee.

BTW, I'm just wondering why do you want to manipulate state in `Evictor`?
If your requirement is reasonable, maybe we could support it officially.


M Singh  于2019年7月14日周日 下午9:07写道：

> Hi:
>
> Is it safe to manipulate the state of an object in the evictor or trigger
> ?  Are there any best practices/dos and don't on this ?
>
> Thanks
>

Re: Apache Flink - Manipulating the state of an object in an evictor or trigger

[taher koitawala]

As far as I know. It is completely safe

On Fri, Jul 19, 2019, 1:35 AM M Singh  wrote:

> Just wanted to see if there is any advice on this question.  Thanks
>
> On Sunday, July 14, 2019, 09:07:45 AM EDT, M Singh 
> wrote:
>
>
> Hi:
>
> Is it safe to manipulate the state of an object in the evictor or trigger
> ?  Are there any best practices/dos and don't on this ?
>
> Thanks
>

Re: Apache Flink - Manipulating the state of an object in an evictor or trigger

[M Singh]

 Just wanted to see if there is any advice on this question.  Thanks
On Sunday, July 14, 2019, 09:07:45 AM EDT, M Singh  
wrote:  
 
 Hi:
Is it safe to manipulate the state of an object in the evictor or trigger ?  
Are there any best practices/dos and don't on this ?
Thanks  

Apache Flink - Manipulating the state of an object in an evictor or trigger

[M Singh]

Hi:
Is it safe to manipulate the state of an object in the evictor or trigger ?  
Are there any best practices/dos and don't on this ?
Thanks