[FLINK-18044] Add the subtask index information to the SourceReaderContext.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.12.0
• Component/s: Connectors / Common
• Labels: pull-request-available
• Assignee: Fangliang Liu
• Reporter: Jiangjie Qin
• Created: 01/Jun/20 06:58
• Updated: 28/Oct/20 01:10
• Resolved: 28/Oct/20 01:10

Description

It is useful for the `SourceReader` to retrieve its subtask id. For example, Kafka readers can create a consumer with proper client id.

Issue Links

• links to: GitHub Pull Request #12647