[jira] [Created] (FLINK-28981) Release Testing: Verify FLIP-245 sources speculative execution

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

Zhu Zhu created FLINK-28981:
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             Summary: Release Testing: Verify FLIP-245 sources speculative execution
                 Key: FLINK-28981
                 URL: https://issues.apache.org/jira/browse/FLINK-28981
             Project: Flink
          Issue Type: Sub-task
          Components: Connectors / Common, 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. 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 for verifying FLIP-245, along with FLIP-168, FLIP-224 and FLIP-249.

More details about this feature and how to use it can be found in this documentation [PR|https://github.com/apache/flink/pull/20507].

To do the verification, the process can be:
 - Write Flink jobs which has some {{source}} subtasks running much slower than others. 3 kinds of sources should be verified, including
   - [Source functions|https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/functions/source/SourceFunction.java]
   - [InputFormat sources|https://github.com/apache/flink/blob/master/flink-core/src/main/java/org/apache/flink/api/common/io/InputFormat.java]
   - [FLIP-27 new sources|https://github.com/apache/flink/blob/master//flink-core/src/main/java/org/apache/flink/api/connector/source/Source.java]
 - 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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