[jira] [Created] (FLINK-5018) User configurable source idle timeout to work with WatermarkStatus emitting

["Tzu-Li (Gordon) Tai (JIRA)" <ji...@apache.org>]

Tzu-Li (Gordon) Tai created FLINK-5018:
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             Summary: User configurable source idle timeout to work with WatermarkStatus emitting
                 Key: FLINK-5018
                 URL: https://issues.apache.org/jira/browse/FLINK-5018
             Project: Flink
          Issue Type: Sub-task
          Components: Streaming
            Reporter: Tzu-Li (Gordon) Tai


There are 2 cases where sources are considered idle and should emit an idle {{WatermarkStatus}} downstream, taking Kafka consumer as example:
- The source instance was not assigned any partitions
- The source instance was assigned partitions, but they currently don't have any data.

For the second case, we can only consider it idle after a timeout threshold. It would be good to make this timeout user configurable besides a default value.



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