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Merge pull request #84335 from mrkm4ntr/fix-node-evaluation

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Add unit test to catch scheduler's node order evaluation regressions
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Kubernetes Prow Robot 2019-11-14 10:05:35 -08:00 committed by GitHub
commit 979688b5cd
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2 changed files with 32 additions and 3 deletions
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6
pkg/scheduler/core/generic_scheduler.go
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@ -164,7 +164,7 @@ type genericScheduler struct {
disablePreemption bool
percentageOfNodesToScore int32
enableNonPreempting bool
lastProcessedNodeIndex int
nextStartNodeIndex int
}
// snapshot snapshots scheduler cache and node infos for all fit and priority
@ -499,7 +499,7 @@ func (g *genericScheduler) findNodesThatFit(ctx context.Context, state *framewor
checkNode := func(i int) {
// We check the nodes starting from where we left off in the previous scheduling cycle,
// this is to make sure all nodes have the same chance of being examined across pods.
nodeInfo := g.nodeInfoSnapshot.NodeInfoList[(g.lastProcessedNodeIndex+i)%allNodes]
nodeInfo := g.nodeInfoSnapshot.NodeInfoList[(g.nextStartNodeIndex+i)%allNodes]
fits, failedPredicates, status, err := g.podFitsOnNode(
ctx,
state,
@ -536,7 +536,7 @@ func (g *genericScheduler) findNodesThatFit(ctx context.Context, state *framewor
// are found.
workqueue.ParallelizeUntil(ctx, 16, allNodes, checkNode)
processedNodes := int(filteredLen) + len(filteredNodesStatuses) + len(failedPredicateMap)
g.lastProcessedNodeIndex = (g.lastProcessedNodeIndex + processedNodes) % allNodes
g.nextStartNodeIndex = (g.nextStartNodeIndex + processedNodes) % allNodes
filtered = filtered[:filteredLen]
if err := errCh.ReceiveError(); err != nil {

29
pkg/scheduler/core/generic_scheduler_test.go
View File

@ -2286,3 +2286,32 @@ func assignDefaultStartTime(pods []*v1.Pod) {
}
}
}
func TestFairEvaluationForNodes(t *testing.T) {
defer algorithmpredicates.SetPredicatesOrderingDuringTest(order)()
predicates := map[string]algorithmpredicates.FitPredicate{"true": truePredicate}
numAllNodes := 500
nodeNames := make([]string, 0, numAllNodes)
for i := 0; i < numAllNodes; i++ {
nodeNames = append(nodeNames, strconv.Itoa(i))
}
nodes := makeNodeList(nodeNames)
g := makeScheduler(predicates, nodes)
// To make numAllNodes % nodesToFind != 0
g.percentageOfNodesToScore = 30
nodesToFind := int(g.numFeasibleNodesToFind(int32(numAllNodes)))
// Iterating over all nodes more than twice
for i := 0; i < 2*(numAllNodes/nodesToFind+1); i++ {
nodesThatFit, _, _, err := g.findNodesThatFit(context.Background(), framework.NewCycleState(), &v1.Pod{})
if err != nil {
t.Errorf("unexpected error: %v", err)
}
if len(nodesThatFit) != nodesToFind {
t.Errorf("got %d nodes filtered, want %d", len(nodesThatFit), nodesToFind)
}
if g.nextStartNodeIndex != (i+1)*nodesToFind%numAllNodes {
t.Errorf("got %d lastProcessedNodeIndex, want %d", g.nextStartNodeIndex, (i+1)*nodesToFind%numAllNodes)
}
}
}