
420 Big Data Computing
Moving Window
A moving window (or sliding window) is a time period that stretches back
in time from the present. For instance, a moving window of two minutes
includes any events that have occurred in the past two minutes. Moving
windows enable to limit the number of events considered by a processing
block, usually with the purpose of aggregating event information or detect-
ing specic event patterns. Figure 14.4 illustrates the typical behavior of a
moving window.
The diagram starts at a given time t and displays the contents of the win-
dow at t + 4 and t + 5 s and so on. The activity as illustrated by ...