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Posted to dev@flink.apache.org by "Till Rohrmann (JIRA)" <ji...@apache.org> on 2016/02/29 14:42:18 UTC
[jira] [Created] (FLINK-3536) Make clearer distinction between
event time and processing time
Till Rohrmann created FLINK-3536:
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Summary: Make clearer distinction between event time and processing time
Key: FLINK-3536
URL: https://issues.apache.org/jira/browse/FLINK-3536
Project: Flink
Issue Type: Improvement
Components: DataStream API
Reporter: Till Rohrmann
Priority: Minor
If you define your own windows it is easy to mix up the time characteristic with the wrong set of predefined {{WindowAssigners}}. You cannot use processing time with a {{TumblingTimeWindows}} window assigner, for example.
Neither from the name of {{TumblingTimeWindows}} nor from the JavaDocs it is clearly obvious that this {{WindowAssigner}} can only be used with event time. I think it would be better to rename the event time window assigner to something like {{TumblingEventTimeWindows}}. Additionally, we could extend the JavaDocs a bit, since not everyone knows that "based on the timestamps" means based on event time.
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