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https://issues.apache.org/jira/browse/FLINK-28981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17599498#comment-17599498
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Godfrey He commented on FLINK-28981:
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can this issue be closed ? [~zhuzh] [~337361...@qq.com]
> 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
> Assignee: Yunhong Zheng
> Priority: Blocker
> Labels: release-testing
> 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
> [document|https://nightlies.apache.org/flink/flink-docs-master/docs/deployment/speculative_execution/].
> 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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