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https://issues.apache.org/jira/browse/SPARK-2277?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matei Zaharia resolved SPARK-2277.
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Resolution: Fixed
> Make TaskScheduler track whether there's host on a rack
> -------------------------------------------------------
>
> Key: SPARK-2277
> URL: https://issues.apache.org/jira/browse/SPARK-2277
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.0.0
> Reporter: Rui Li
> Assignee: Rui Li
> Fix For: 1.1.0
>
>
> When TaskSetManager adds a pending task, it checks whether the tasks's
> preferred location is available. Regarding RACK_LOCAL task, we consider the
> preferred rack available if such a rack is defined for the preferred host.
> This is incorrect as there may be no alive hosts on that rack at all.
> Therefore, TaskScheduler should track the hosts on each rack, and provides an
> API for TaskSetManager to check if there's host alive on a specific rack.
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