[jira] [Created] (FLINK-3714) Add Support for "Allowed Lateness"

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-3714:
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             Summary: Add Support for "Allowed Lateness"
                 Key: FLINK-3714
                 URL: https://issues.apache.org/jira/browse/FLINK-3714
             Project: Flink
          Issue Type: Sub-task
          Components: Streaming
            Reporter: Aljoscha Krettek


As mentioned in https://docs.google.com/document/d/1Xp-YBf87vLTduYSivgqWVEMjYUmkA-hyb4muX3KRl08/edit# we should add support for an allowed lateness setting.

This includes several things:

 - API for setting allowed lateness
 - Dropping of late elements
 - Garbage collection of event-time windows

Lateness only makes sense for event-time windows. So we also have to figure out what the API for this should look like and especially what should happen with the "stream-time characteristic" switch. For example in this:

{code}
env.setStreamTimeCharacteristic(ProcessingTime)
...
DataStream in = ...

result = in
  .keyBy()
  .timeWindow()
  .allowedLateness()
  .apply()
{code}

I think the setting can be silently ignored when doing processing-time windowing.




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