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From "David Robinson (JIRA)" <>
Subject [jira] [Created] (AURORA-1181) optimize host_drain to speed up maintenance
Date Tue, 10 Mar 2015 00:46:38 GMT
David Robinson created AURORA-1181:

             Summary: optimize host_drain to speed up maintenance
                 Key: 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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