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Which compute host does nova-schedular pick if there is a tie after "Filtering and Weighing" algorithm?

asked 2017-06-19 09:20:01 -0500

udayutkarsh gravatar image 
 Suppose I have 20 compute hosts and there is tie among 5 hosts after "Filtering and Weighing" algorithm. In this case how does nova-schedular act?
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answered 2017-06-19 10:06:57 -0500

Bernd Bausch gravatar image

updated 2017-06-19 10:07:41 -0500

In Ocata, I think this is done by this code line:

chosen_host = random.choice(weighed_hosts)

It should be clear what this line does. But of course, there is no guarantee that Pike will be the same.

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At this moment it is, but nova is changing the placement/scheduler/cells behaviour. But this last host election is likely to remain as it is for a while. Chose a random node if more than one have the same weight

Eduardo Gonzalez gravatar imageEduardo Gonzalez ( 2017-06-19 10:12:12 -0500 )edit
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Asked: 2017-06-19 09:20:01 -0500

Seen: 30 times

Last updated: Jun 19 '17

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