tumbling time window, date boundary and timezone

Posted by Hironori Ogibayashi on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/tumbling-time-window-date-boundary-and-timezone-tp8140.html

Hello,

I want to calculate daily access count using Flink streaming.
Flink's TumblingProcessingTimeWindow assigns events to windows of
00:00 GMT to 23:59 GMT each day, but I live in Japan (GMT+09:00) and
want date boundaries to be 09:00 GMT (00:00 JST).
Do I have to implement my own WindowAssigner for this use case?

Thanks,
Hironori Ogibayashi