Re: Tiemrs and restore

[Aljoscha Krettek]

Gordon is correct: there was a bug on a very old version of Flink that caused 
processing-timers not to be invoked after restore but that was fixed.

Aljoscha

> On 16. Apr 2018, at 06:20, Tzu-Li (Gordon) Tai  wrote:
> 
> Hi Alberto,
> 
> Looking at the code, I think the current behavior is that all timers (both 
> processing time and event time) are re-registered on restore, and therefore 
> should be triggered automatically.
> So, for processing time timers, on restore all timers that were supposed to 
> be fired while the job was down should fire automatically; for event time 
> timers, they will be triggered once the watermark passes their timestamps.
> 
> Also looped in Aljoscha on this, in case I misunderstood anything.
> 
> Cheers,
> Gordon
> 
> On 16 April 2018 at 1:20:00 AM, Alberto Mancini (ab.manc...@gmail.com 
> ) wrote:
> 
>> Hello,
>> according to this stackoverflow response 
>> https://stackoverflow.com/questions/36306136/will-apache-flink-restore-trigger-timers-after-failure
>>  
>> 
>> IIUC we should expect that after a restore the timers will be not executed 
>> until a new timer is scheduled. 
>> I wonder if this is still true and if there is any chance of forcing the 
>> restart of the timer task.
>> 
>> Thank you. 
>> 
>> Regards,
>>Alberto. 

Re: Tiemrs and restore

[Tzu-Li (Gordon) Tai]

Hi Alberto,

Looking at the code, I think the current behavior is that all timers (both 
processing time and event time) are re-registered on restore, and therefore 
should be triggered automatically.
So, for processing time timers, on restore all timers that were supposed to be 
fired while the job was down should fire automatically; for event time timers, 
they will be triggered once the watermark passes their timestamps.

Also looped in Aljoscha on this, in case I misunderstood anything.

Cheers,
Gordon

On 16 April 2018 at 1:20:00 AM, Alberto Mancini (ab.manc...@gmail.com) wrote:

Hello,
according to this stackoverflow response 
https://stackoverflow.com/questions/36306136/will-apache-flink-restore-trigger-timers-after-failure
IIUC we should expect that after a restore the timers will be not executed 
until a new timer is scheduled. 
I wonder if this is still true and if there is any chance of forcing the 
restart of the timer task.

Thank you. 

Regards,
   Alberto. 

Tiemrs and restore

[Alberto Mancini]

Hello,
according to this stackoverflow response
https://stackoverflow.com/questions/36306136/will-apache-flink-restore-trigger-timers-after-failure
IIUC we should expect that after a restore the timers will be not executed
until a new timer is scheduled.
I wonder if this is still true and if there is any chance of forcing the
restart of the timer task.

Thank you.

Regards,
   Alberto.