PI. Using sliding windows with the slide of <em>S</em>
translates into an expected value of evaluation delay equal to <em>S/2.</em>
This means that you would need to define a window slide of 600-1000 ms
to fulfill the low-latency requirement of 300-500 ms delay, even before
taking any actual computation time into account. The fact that Flink
stores a separate window state for each sliding window pane renders this
approach unfeasible under any moderately high load conditions.</p>
<p>In order to satisfy the r