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From "David Robinson (JIRA)" <>
Subject [jira] [Commented] (AURORA-1181) optimize host_drain to speed up maintenance
Date Tue, 10 Mar 2015 22:45:38 GMT


David Robinson commented on AURORA-1181:

> optimize host_drain to speed up maintenance
> -------------------------------------------
>                 Key: AURORA-1181
>                 URL:
>             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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