[jira] [Created] (FLINK-18044) Add the subtask index information to the SourceReaderContext.

[Jiangjie Qin (Jira)]

Jiangjie Qin created FLINK-18044:
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             Summary: Add the subtask index information to the 
SourceReaderContext.
                 Key: FLINK-18044
                 URL: https://issues.apache.org/jira/browse/FLINK-18044
             Project: Flink
          Issue Type: Sub-task
          Components: Connectors / Common
            Reporter: Jiangjie Qin


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



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