public class SessionWindowDefinition extends WindowDefinition
|Modifier and Type||Method and Description|
Returns the session timeout, which is the largest difference in the timestamps of any two consecutive events in the session window.
Sets the period in milliseconds at which the windowed aggregation stage will emit partial results of all the windows that contain some data, but the watermark hasn't yet advanced enough to close them and emit the final results.
earlyResultsPeriod, session, sliding, tumbling
public SessionWindowDefinition setEarlyResultsPeriod(long earlyResultPeriodMs)
Consider this example: we're collecting a 1-minute tumbling window of stock exchange data. The results we're getting pertain to the minute that just elapsed, but we'd also like to detect any sudden changes within the running minute. We can set the early results period to 1000 ms and get an update every second for the window that's currently being filled with data.
Note that, for a sliding window, there will be many incomplete windows
that contain some data and you'll get the early results for all of them.
Similarly, if you configure a high-enough
maxLag for the event
timestamps, there can be more than one tumbling/session window with
The default value is zero, which means "don't emit early results".
earlyResultPeriodMs- the period in milliseconds from one start of the emission of early results to the next one
public long sessionTimeout()
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