[jira] [Commented] (AURORA-1181) optimize host_drain to speed up maintenance

["David Robinson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AURORA-1181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355873#comment-14355873 ] 

David Robinson commented on AURORA-1181:
----------------------------------------

https://reviews.apache.org/r/31913/

> optimize host_drain to speed up maintenance
> -------------------------------------------
>
>                 Key: AURORA-1181
>                 URL: https://issues.apache.org/jira/browse/AURORA-1181
>             Project: Aurora
>          Issue Type: Task
>          Components: Maintenance
>            Reporter: David Robinson
>            Priority: Minor
>
> Aurora's maintenance primitives, whilst great, can be frustrating to use when dealing with large clusters, primarily due to the speed of draining hosts. The host_drain feature does accept a grouping function that can be used to drain hosts in batches, but for large clusters we typically don't want to arbitrarily divide the cluster into groups/batches and would prefer instead to drain everything that was requested, where possible, without violating the SLA.
> eg, 100 hosts in need of maintenance, with each host running 1 task (of many) from 100 different jobs -- all 100 hosts could be drained simultaneously without violating the SLA.



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