Thanks Aljoscha.
Whenever I am using WindowFunction.apply() on keyed stream, apply() will be
called once or multiple times (equal to number of keys in that windowed
stream)?
Ex:
DataStream<Boolean> dataStream = env
.socketTextStream("localhost", 9999)
.flatMap(new Splitter())
.keyBy(0)
.timeWindow(Time.seconds(10))
.apply(new WindowFunction<Tuple2<String,Integer>, Boolean,
Tuple, TimeWindow>() {
@Override
public void apply(Tuple key, TimeWindow window,
Iterable<Tuple2<String, Integer>> input,
Collector<Boolean> out) throws Exception {
//Some business logic
}
});
Regards,
Swapnil
On Wed, Sep 14, 2016 at 2:26 PM, Aljoscha Krettek <aljos...@apache.org>
wrote:
> Hi,
> WindowFunction.apply() will be called once for each window so you should
> be able to do the setup/teardown in there. open() and close() are called at
> the start of processing, end of processing, respectively.
>
> Cheers,
> Aljoscha
>
> On Wed, 14 Sep 2016 at 09:04 Swapnil Chougule <the.swapni...@gmail.com>
> wrote:
>
>> Hi Team,
>>
>> I am using tumbling window functionality having window size 5 minutes.
>> I want to perform setup & teardown functionality for each window. I tried
>> using RichWindowFunction but it didn't work for me.
>> Can anybody tell me how can I do it ?
>>
>> Attaching code snippet what I tried
>>
>> impressions.map(new LineItemAdUnitAggr()).keyBy(0)
>> .timeWindow(Time.seconds(300)).apply(new
>> RichWindowFunction<Tuple2<Tuple2<Integer,Integer>,Long>,
>> Boolean, Tuple, TimeWindow>() {
>>
>> @Override
>> public void open(Configuration parameters) throws
>> Exception {
>> super.open(parameters);
>> //setup method
>> }
>>
>> public void apply(Tuple key, TimeWindow window,
>> Iterable<Tuple2<Tuple2<Integer, Integer>, Long>>
>> input,
>> Collector<Boolean> out) throws Exception {
>> //do processing
>> }
>>
>> @Override
>> public void close() throws Exception {
>> //tear down method
>> super.close();
>> }
>> });
>>
>> Thanks,
>> Swapnil
>>
>
