Muhammad Samir Khan updated TEZ-3816:
    Attachment: TEZ-3816.001.patch

Added ability to LegacyTaskRuntimeEstimator to speculate based on timeout for 
single task vertices.

> 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
>         Attachments: TEZ-3816.001.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 either have a configurable timeout after which the 
> tasks automatically speculate.

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