Hi,
Yes, if you use ProcessFunction or CoProcessFunction you can (and should) set a 
timer to clean up state.

Best,
Aljoscha

> On 7. May 2017, at 09:28, yunfan123 <yunfanfight...@foxmail.com> wrote:
> 
> But what happened if some data can't be merged forever ?
> The state will be saved forever? 
> Can I set a timeout?
> 
> 
> 
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