Chia-Ping Tsai created YUNIKORN-2551:
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             Summary: Move `buildRules` out of `AppPlacementManager` to be a 
function
                 Key: YUNIKORN-2551
                 URL: https://issues.apache.org/jira/browse/YUNIKORN-2551
             Project: Apache YuniKorn
          Issue Type: Improvement
            Reporter: Chia-Ping Tsai
            Assignee: Chia-Ping Tsai


https://github.com/apache/yunikorn-core/blob/master/pkg/scheduler/placement/placement.go#L70


{code:java}
func (m *AppPlacementManager) initialise(rules []configs.PlacementRule) error {
        log.Log(log.Config).Info("Building new rule list for placement manager")
        // build temp list from new config
        // here!!!
        tempRules, err := m.buildRules(rules)
        if err != nil {
                return err
        }
        m.Lock()
        defer m.Unlock()
{code}

We call `m.buildRules` without holding AppPlacementManager lock since 
`buildRules` does not touch any fields of `AppPlacementManager`. It seems to me 
we should make `buildRules` be a function rather than method of 
`AppPlacementManager`. 



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