I want to do performance analysis of Flink CEP engine and I came across these classes
org.apache.flink.optimizer.costs.CostEstimator;
org.apache.flink.optimizer.costs.Costs;
org.apache.flink.optimizer.costs.DefaultCostEstimator;
But the issue is that I don't know how to use either of this class. Can someone provide me with a code or insinuation regarding, how can I find the costs estimation for operators { join for example} in Flink.
Below is the code for a join that I am performing in Flink
DataStream<JoinedEvent> joinedEventDataStream = stream1.join(stream2).where(new KeySelector<RRIntervalStreamEvent, Long>() {
@Override
public Long getKey(RRIntervalStreamEvent rrIntervalStreamEvent) throws Exception {
return rrIntervalStreamEvent.getTime();
}
})
.equalTo(new KeySelector<qrsIntervalStreamEvent, Long>() {
@Override
public Long getKey(qrsIntervalStreamEvent qrsIntervalStreamEvent) throws Exception {
return qrsIntervalStreamEvent.getTime();
}
})
.window(TumblingEventTimeWindows.of(Time.milliseconds(1000)))
.apply(new JoinFunction<RRIntervalStreamEvent, qrsIntervalStreamEvent, JoinedEvent>() {
@Override
public JoinedEvent join(RRIntervalStreamEvent rr, qrsIntervalStreamEvent qrs) throws Exception {
//getting the cost -- just checking
// costs.getCpuCost();
return new JoinedEvent(rr.getTime(),rr.getSensor_id(),qrs.getSensor_id(),rr.getRRInterval(),qrs.getQrsInterval());
}
});
how can I compute the cost for this join?
