Hi, There is possibly an issue with EventTimeSessionWindows where a gap is specified for considering items in the same session. Here the logic is, if two adjacent items have a difference in event timestamps of more than the gap then the items are considered to be in separate session. The issue is, what happens if the gap between streaming records is never (or for a very long time) less than the session gap. This is likely to lead to a race condition. Is this a bug? How do we deal with this to process windows in finite time? Please could you suggest. Thanks. – Embedding Options