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Posted to dev@flink.apache.org by "Tzu-Li (Gordon) Tai (Jira)" <ji...@apache.org> on 2020/09/11 04:01:00 UTC
[jira] [Created] (FLINK-19199) Add execution attempt ID to feedback
channel keys
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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