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From Martin Neumann <mneum...@sics.se>
Subject Re: Streaming time window
Date Thu, 10 Dec 2015 13:41:08 GMT
Hi Fabian,

thanks for your answer. Can I do the same in java using normal time windows
(without additional trigger)?

My current codes looks like this:

        .timeWindow(Time.of(WINDOW_SIZE, TimeUnit.MILLISECONDS))
        .fold(new Tuple2<>("", new HashMap<>()), new

How can I get access to the time window object in the fold function?

cheers Martin

On Thu, Dec 10, 2015 at 12:20 PM, Fabian Hueske <fhueske@gmail.com> wrote:

> Hi Martin,
> you can get the start and end time of a window from the TimeWindow object.
> The following Scala code snippet shows how to access the window end time
> (start time is equivalent):
> .timeWindow(Time.minutes(5))
> .trigger(new EarlyCountTrigger(earlyCountThreshold))
> .apply { (
>   key: Int,
>   window: TimeWindow,
>   vals: Iterable[(Int, Short)],
>   out: Collector[(Int, Long, Int)]) =>
>     out.collect( ( key, window.getEnd, vals.map( _._2 ).sum ) )
> }
> Cheers, Fabian
> 2015-12-10 12:04 GMT+01:00 Martin Neumann <mneumann@sics.se>:
>> Hej,
>> Is it possible to extract the start and end window time stamps from
>> within a window operator?
>> I have an event time based window that does a simple fold function. I
>> want to put the output into elasticsearch and want to preserve the start
>> and end timestamp of the data so I can directly compare it with related
>> data. The only Idea I had so far was to manually keep track of the minimum
>> and maximum timestamp found in a window and pass them along with the
>> output. This is a quite bad approximation since the window I see depends
>> alot on how the values are spaced out. Anyone an idea how to do this?
>> cheers Martin

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