Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1819#discussion_r56793439
--- Diff: docs/apis/streaming/event_timestamps_watermarks.md ---
@@ -308,6 +269,89 @@ class TimeLagWatermarkGenerator extends
AssignerWithPeriodicWatermarks[MyEvent]
</div>
+#### **With Ascending timestamps**
+
+The simplest special case for periodic watermark generation is the case
where timestamps within one source occur in ascending order.
+In that case, the current timestamp can always act as a watermark, because
no lower timestamps will occur any more.
+
+Note that it is only necessary that timestamps are ascending *per parallel
data source instance*. For example, if
--- End diff --
Does this also holds true if a KafkaConsumer task has multiple partitions
assigned?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
