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https://issues.apache.org/jira/browse/FLINK-28137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhu Zhu reassigned FLINK-28137:
-------------------------------
Assignee: Zhu Zhu
> Introduce SpeculativeScheduler
> ------------------------------
>
> Key: FLINK-28137
> URL: https://issues.apache.org/jira/browse/FLINK-28137
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Coordination
> Reporter: Zhu Zhu
> Assignee: Zhu Zhu
> Priority: Major
> Fix For: 1.16.0
>
>
> A SpeculativeScheduler will be used if speculative execution is enabled. It
> extends AdaptiveBatchScheduler so that speculative execution can work along
> with the feature to adaptively tuning parallelisms for batch jobs.
> The major differences of SpeculativeScheduler are:
> * SpeculativeScheduler needs to be able to directly deploy an Execution,
> while AdaptiveBatchScheduler can only perform ExecutionVertex level
> deployment.
> * SpeculativeScheduler does not restart the ExecutionVertex if an execution
> fails when any other current execution is still making progress
> * SpeculativeScheduler listens on slow tasks. Once there are slow tasks, it
> will block the slow nodes and deploy speculative executions of the slow tasks
> on other nodes.
> * Once any execution finishes, SpeculativeScheduler will cancel all the
> remaining executions of the same execution vertex.
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