Hi Soheil,
The clear() method performs any action needed upon removal of the
corresponding window. This is called when a window is purged. The
differences between FIRE and FIRE_AND_PURGE is FIRE only trigger the
computation while FIRE_AND_PURGE trigger the computation and clear the
elements in the
Hi Soheil,
Did you read the documentation about Flink Window/Trigger [1]?
FIRE_AND_PURGE usually used to implement the count window. Flink provide a
PurgingTrigger as a warper for other trigger to make those triggers can be
purge. One of this class use case is count window[2][3].
About your exam
