Tzu-Li (Gordon) Tai created FLINK-19199:
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Summary: Add execution attempt ID to feedback channel keys
Key: FLINK-19199
URL: https://issues.apache.org/jira/browse/FLINK-19199
Project: Flink
Issue Type: Task
Components: Stateful Functions
Reporter: Tzu-Li (Gordon) Tai
Assignee: Tzu-Li (Gordon) Tai
The feedback brokers identify a single pair of producer / consumer with a
{{SubtaskFeedbackKey}}, which is uniquely identified within a job by only the
subtask index.
This can potentially become an issue in job restart scenarios, since the
feedback brokers are static fields, and are durable across non-TM failure job
restarts.
Currently it is not a problem because we do clear broker channels on close, but
adding an extra execution attempt ID into the {{SubtaskFeedbackKey}} can make
things safer.
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