Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1184#issuecomment-143728731
Event-time windowing is supported if you manually enable watermarks using
`setWatermarkInterval` (it is still called `setAutoWatermarkInterval` but I
want to change this in an upcoming PR.
It is very tricky to derive a watermark interval, that's why I'm not doing
it yet. In the upcoming PR I want to add an operator that can extract
timestamps from records and also emit watermarks based on these timestamps. I
guess no one would implement a custom source for watermark emission. Most
people would use Kafka and then extract timestamps after that.
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