What's a 'topic' in nova?

asked 2011-07-19 13:54:49 -0600

This is a jargon question for Nova. I have seen certain flags such as network_topic, compute_topic, etc. What exactly is a topic and what values would it hold? What context are topics used in?

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answered 2011-07-19 13:59:07 -0600

vishvananda
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A topic represents an individual message queue that components can post to or read from. By default each nova-xxx worker that starts a nova/service.py:Service will listen on a topic based on their binary name and one based on binary name and host name, so nova-volume will listen for messages on 'volume' and 'volume.$HOSTNAME' To send a message to a volume worker you send the message to one of those topics.

Vish

On Jul 19, 2011, at 6:56 AM, Rohit Karajgi wrote:

New question #165321 on OpenStack Compute (nova): https://answers.launchpad.net/nova/+q...

This is a jargon question for Nova. I have seen certain flags such as network_topic, compute_topic, etc. What exactly is a topic and what values would it hold? What context are topics used in?

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