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https://issues.apache.org/jira/browse/TEZ-3816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhiyuan Yang closed TEZ-3816.
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> Ability to automatically speculate single-task vertices
> -------------------------------------------------------
>
> Key: TEZ-3816
> URL: https://issues.apache.org/jira/browse/TEZ-3816
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Muhammad Samir Khan
> Assignee: Muhammad Samir Khan
> Fix For: 0.9.1
>
> Attachments: TEZ-3816.001.patch, TEZ-3816.002.patch,
> TEZ-3816.003.patch
>
>
> When a single-task vertex is unlucky, it lands on a very slow node.
> Speculation doesn't currently apply when there are no other tasks to compare
> with. It would be good to have a configurable timeout after which the tasks
> automatically speculate.
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