[FLINK-5018] Make source idle timeout user configurable

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Won't Do
• Component/s: API / DataStream
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: Tzu-Li (Gordon) Tai
• Created: 04/Nov/16 12:43
• Updated: 26/Oct/20 14:30
• Resolved: 26/Oct/20 14:30

Description

There are 2 cases where sources are considered idle and should emit an idle StreamStatus 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.

Issue Links

• links to: GitHub Pull Request #7990