Re: Ask about counting elements per window

[Hequn Cheng]

Hi Rad,

You can take a look at the group window[1] of SQL. I think it may help you.

Best, Hequn
[1]
https://ci.apache.org/projects/flink/flink-docs-master/dev/table/sql.html#aggregations

On Thu, Nov 1, 2018 at 12:53 AM Rad Rad <radhya.sa...@gmail.com> wrote:

> Hi All,
>
> I have a GPS stream consumed by FlinkKafkaConsumer which contains a set of
> GPSs of different users. I need to count a number of users per a specific
> window of this stream.
>
> Could anyone help me, a part of my code is below
>
>
>         // read data from Kafka
>                 DataStream stream = env.addSource(
>                                 new
> FlinkKafkaConsumer09<>(parameterTool.getRequired("topic")
>                                                 , new
> JSONDeserializationSchema(), parameterTool.getProperties()));
>
>                 DataStream<Tuple7&lt;String, String,String, String, Float,
> Float,
> Timestamp>>  gpsStream  = stream.flatMap(gpsFlatMapFunc).
>
>
> Thanks in advanced.
>
>
>
>
>
> --
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>