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Merge pull request #26959 from wojtek-t/fix_performance_flakes

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Automatic merge from submit-queue

Fix scalability flakes in small clusters

Fix #26185

@xiang90 @hongchaodeng @gmarek
This commit is contained in:
k8s-merge-robot 2016-06-07 16:13:10 -07:00
commit 457d42e70e
1 changed files with 7 additions and 32 deletions
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39
test/e2e/framework/metrics_util.go
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@ -42,10 +42,12 @@ const (
NodeStartupThreshold = 4 * time.Second
podStartupThreshold time.Duration = 5 * time.Second
// TODO: Decrease the small threshold to 250ms once tests are fixed.
apiCallLatencySmallThreshold time.Duration = 500 * time.Millisecond
apiCallLatencyMediumThreshold time.Duration = 500 * time.Millisecond
apiCallLatencyLargeThreshold time.Duration = 1 * time.Second
// We are setting 1s threshold for apicalls even in small clusters to avoid flakes.
// The problem is that if long GC is happening in small clusters (where we have e.g.
// 1-core master machines) and tests are pretty short, it may consume significant
// portion of CPU and basically stop all the real work.
// Increasing threshold to 1s is within our SLO and should solve this problem.
apiCallLatencyThreshold time.Duration = 1 * time.Second
)
type MetricsForE2E metrics.MetricsCollection
@ -225,31 +227,9 @@ func readLatencyMetrics(c *client.Client) (APIResponsiveness, error) {
return a, err
}
// Returns threshold for API call depending on the size of the cluster.
// In general our goal is 1s, but for smaller clusters, we want to enforce
// smaller limits, to allow noticing regressions.
func apiCallLatencyThreshold(numNodes int) time.Duration {
if numNodes <= 250 {
return apiCallLatencySmallThreshold
}
if numNodes <= 500 {
return apiCallLatencyMediumThreshold
}
return apiCallLatencyLargeThreshold
}
func listNodesLatencyThreshold(numNodes int) time.Duration {
return apiCallLatencyLargeThreshold
}
// Prints top five summary metrics for request types with latency and returns
// number of such request types above threshold.
func HighLatencyRequests(c *client.Client) (int, error) {
nodes, err := c.Nodes().List(api.ListOptions{})
if err != nil {
return 0, err
}
numNodes := len(nodes.Items)
metrics, err := readLatencyMetrics(c)
if err != nil {
return 0, err
@ -258,13 +238,8 @@ func HighLatencyRequests(c *client.Client) (int, error) {
badMetrics := 0
top := 5
for _, metric := range metrics.APICalls {
threshold := apiCallLatencyThreshold(numNodes)
if metric.Verb == "LIST" && metric.Resource == "nodes" {
threshold = listNodesLatencyThreshold(numNodes)
}
isBad := false
if metric.Latency.Perc99 > threshold {
if metric.Latency.Perc99 > apiCallLatencyThreshold {
badMetrics++
isBad = true
}