Mailing-List: contact user-help@flink.apache.org; run by ezmlm
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Subject: Re: Process Function
To: Navneeth Krishnan <reachnavneeth2@gmail.com>, user@flink.apache.org
References: <CA+YY8JZNc_gRH1rFGz-AXGkGKST0-hZV7Aa=GOroAZ0dHQri2g@mail.gmail.com>
From: Kien Truong <duckientruong@gmail.com>
Message-ID: <f7fe39e9-d79a-72b6-d095-4acb3bd386c6@gmail.com>
Date: Tue, 5 Sep 2017 21:55:31 +0700
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Hi,

You can register a processing time timer inside the onTimer and the open 
function to have a timer that run periodically.

Pseudo-code example:

|ValueState<Long> lastRuntime; void open() { 
ctx.timerService().registerProcessingTimeTimer(current.timestamp + 
60000); } void onTimer() { // Run the periodic task if 
(lastRuntime.get() + 60000 == timeStamp) { periodicTask(); } // 
Re-register the processing time timer timer 
lastRuntime.setValue(timeStamp); |   ||ctx.timerService().registerProcessingTimeTimer(current.timestamp + 
60000);| } void periodicTask() |


For the second question, timer are already scoped by key, so you can 
keep a lastModified variable as a ValueState,
then compare it to the timestamp provided by the timer to see if the 
current key should be evicted.
Checkout the example on the ProcessFunction page.

https://ci.apache.org/projects/flink/flink-docs-release-1.2/dev/stream/process_function.html

Best regards,
Kien

On 9/5/2017 11:49 AM, Navneeth Krishnan wrote:
> Hi All,
>
> I have a streaming pipeline which is keyed by userid and then to a 
> flatmap function. I need to clear the state after sometime and I was 
> looking at process function for it.
>
> Inside the process element function if I register a timer wouldn't it 
> create a timer for each incoming message?
> |// schedule the next timer 60 seconds from the current event time 
> ctx.timerService().registerEventTimeTimer(current.timestamp + 60000);|
> How can I get something like a clean up task that runs every 2 mins 
> and evicts all stale data? Also is there a way to get the key inside 
> onTimer function so that I know which key has to be evicted?
>
> Thanks,
> Navneeth

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