So the second test day went even worse - at first I had issues with missing packages for Fedora 20 (fixed during the test day itself) and started working on Fedora 19 instead. Then I hit some issue with HTTP requests from the ovirt-optimizer machine to the ovirt-engine (on port 80) seemingly being redirected to HTTPS - is this a change that took place after the first test day? Feature owner was very kind in helping me even though he was on a day off, built a patched-up package for me to test and found that connecting to port 443 works as expected (patches pushed to gerrit on the very same day). Unfortunately this was already late into the test day and I haven't gotten to test any non-trivial host/VM setup. On 03/07/14 20:18, Lior Vernia wrote:

In this test day I was to test the SLA team's OptaPlanner integration.

Some background for those who aren't familiar with the feature: the problem of finding an optimal solution for VM scheduling/balancing is NP-hard, therefore for large deployment it is only feasible to find approximately optimal solutions.

OptaPlanner is a very nice utility that contains a lot of approximation algorithms for computationally-hard problems such as scheduling, so the plan is for oVirt to use OptaPlanner (running on a dedicated machine) to "hint" to the administrator where to migrate VMs to achieve more optimal placement on hosts; "optimality" is with respect to cluster policy.

Unfortunately, due to some technical difficulties and a lack of documentation, I did not manage to get very far - only verified that when the OptaPlanner machine and oVirt engine are properly configured, the new tab under cluster appears and shows output from the OptaPlanner.

The feature page mainly documented the implementation of the feature, but contained no information on what had to be installed or any example testing scenarios. However, msivak (feature owner) was very responsive and updated the feature page as soon as these gaps were discovered, so now it's clear how to configure a deployment to use OptaPlanner.

Hopefully I'll be able to further test the feature soon, and at the very latest during the next test day.

Yours, Lior.