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From "Nitin Mehta (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CLOUDSTACK-8181) Overprovisioning hosts happens when using first fit allocator + high disable threshold
Date Mon, 26 Jan 2015 18:47:34 GMT
Nitin Mehta created CLOUDSTACK-8181:
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             Summary: Overprovisioning hosts happens when using first fit allocator + high
disable threshold
                 Key: CLOUDSTACK-8181
                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8181
             Project: CloudStack
          Issue Type: Improvement
      Security Level: Public (Anyone can view this level - this is the default.)
            Reporter: Nitin Mehta


1) In the host allocator, under a given cluster, we list all the hosts which match host tags
2) We iterate over this list of hosts and for each host check that the host has capacity or
not
3) We return the first host found having capacity.
4) This causes usually the same host to get all the VMs until it goes out of capacity
5) So the change needed is return the host which has maximum free capacity from the list of
hosts, instead of the first fit
6) Since this is not a fix but kind of a mini-feature, we need QA tests to check that the
order used by the allocator is correctly working.



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