Performance optimizations for the polling of VM status in RO

Proposers

• Francisco Rodríguez (Indra)

Description

RO interrogates the VIM for each VM in order to keep track of its status internally. Since change https://osm.etsi.org/gerrit/#/c/osm/RO/+/12293/, the interval for the polling is configurable and can be deactivated if -1 is used (REFRESH_ACTIVE time). This feature proposes to improve further the polling mechanism to achieve better performance by:

• Ensuring that the polling operations are evenly distributed during all the REFRESH_ACTIVE time, ensuring that requests do not peak at specific intervals, for instance, making the timing random.
• Performing the status check using a more efficient mechanism than individual VM query, possibly a bulk operation, in order to reduce the number of operations required.

Demo or definition of done

First sub-feature: Deployment of two network services with a single VM in total. The polling operations are spaced during the REFRESH_ACTIVE interval.

Second sub-feature: Deployment of a single network service with a number of VM. A single polling operation is performed each REFRESH_ACTIVE interval.

Implementation Plan

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