[jira] [Created] (FLINK-15100) Add the interface and base implementation for SourceReader.

[Shang Yuanchun (Jira)]

Jiangjie Qin created FLINK-15100:
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             Summary: Add the interface and base implementation for SourceReader.
                 Key: FLINK-15100
                 URL: https://issues.apache.org/jira/browse/FLINK-15100
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Coordination
            Reporter: Jiangjie Qin


Add the interface and base implementation for SourceReader. Including threading model, SplitReader / RecordEmitter. This ticket should also integrate the SourceReader into the SourceReaderStreamTask.



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