Sliding window

Fixed-sized, overlapping time or event count window analytic function support

Objective

Sliding windows, unlike tumbling windows, output events only for points in time when the content of the window actually changes.

In other words, when an event enters or exits the window. Every window has at least one event. Events can belong to more than one sliding window.

Time based windows

Example

Configures a sliding time based window with a size of 10 seconds using an analytical slide window of 7 seconds.

time window:
  emitting type: pageFailures
  policy:
    type: slidingTime
    slide: 7
    window size: 10
    time unit: SECONDS

Attributes schema

Attribute	Description	Data Type	Required
window size	Size of window with respect to timeUnit	Long
slide	Time interval to shift in to next window	Long
time unit	TimeUnit used for configuring window trigger. Supported types: NANOSECONDS MICROSECONDS MILLISECONDS SECONDS MINUTES HOURS DAYS	TimeUnit Default: MILLISECONDS

Event count based windows

Example

Configures a sliding window with a maximum of 1000 events with a slide size of 300 events.

time window:
  emitting type: pageFailures
  policy:
    type: slidingCount
    window size: 1000
    slide: 300

Attributes schema

Attribute	Description	Data Type	Required
window size	Maximum number of events before triggering window processing	Long
slide	Number of latest events to shift in to the next window	Long