[jira] [Created] (FLINK-28980) Release Testing: Verify FLIP-168 speculative execution

["Zhu Zhu (Jira)" <ji...@apache.org>]

Zhu Zhu created FLINK-28980:
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             Summary: Release Testing: Verify FLIP-168 speculative execution
                 Key: FLINK-28980
                 URL: https://issues.apache.org/jira/browse/FLINK-28980
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Coordination
            Reporter: Zhu Zhu
             Fix For: 1.16.0


Speculative execution is introduced in Flink 1.16 to deal with temporary slow tasks caused by slow nodes. More details about this feature can be found in this documentation [PR|https://github.com/apache/flink/pull/20507].

This feature currently consists of 4 FLIPs:
 - FLIP-168: Speculative Execution core part
 - FLIP-224: Blocklist Mechanism
 - FLIP-245: Source Supports Speculative Execution
 - FLIP-249: Flink Web UI Enhancement for Speculative Execution

This ticket aims to verify FLIP-168, along with FLIP-224 and FLIP-249.
To do the verification, the process can be:
 - Write a Flink job which has a subtask running much slower than others (e.g. sleep indefinitely if it runs on a certain host, the hostname can be retrieved via InetAddress.getLocalHost().getHostName(), or if its (subtaskIndex + attemptNumer) % 2 == 0)
 - Modify Flink configuration file to enable speculative execution and tune the configuration as you like
 - Submit the job. Checking the web UI, logs, metrics and produced result.



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