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Merge pull request #48737 from mattmoyer/faster-kubeadm-join

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Automatic merge from submit-queue

kubeadm: begin polling for bootstrap cluster info immediately

**What this PR does / why we need it**:
This PR changes the behavior of the `kubeadm` loop that polls the API server waiting for discovery information (`cluster-info`). The previous (inadvertent?) behavior was to sleep for `constants.DiscoveryRetryInterval` (5 seconds) before the first request ([`PollInfinite`](https://godoc.org/k8s.io/apimachinery/pkg/util/wait#PollInfinite) vs. [`PollImmediateInfinite`](https://godoc.org/k8s.io/apimachinery/pkg/util/wait#PollImmediateInfinite)).

After this change, `kubeadm` begins does the first check immediately before it moves into the slower polling mode. This takes around 5 seconds off the average time for a new node to join.

#### Before (~5.5s)
```
root@worker:~# time kubeadm join --token abc.123 192.168.42.10:6443
[...]
real	0m5.523s
user	0m0.112s
sys	0m0.124s
```

#### After (~0.5s)
```
root@worker:~# time kubeadm join --token abc.123 192.168.42.10:6443
[...]
real	0m0.587s
user	0m0.092s
sys	0m0.132s
```

**Which issue this PR fixes**:

**Special notes for your reviewer**:
This is my first Kubernetes PR, so please let me know if it's formatted correctly.

**Release note**:

```release-note
NONE
```
This commit is contained in:
Kubernetes Submit Queue 2017-07-12 06:33:36 -07:00 committed by GitHub
commit 7d97208ef7
1 changed files with 1 additions and 1 deletions
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2
cmd/kubeadm/app/discovery/token/token.go
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@ -58,7 +58,7 @@ func RetrieveValidatedClusterInfo(discoveryToken string, tokenAPIServers []strin
fmt.Printf("[discovery] Created cluster-info discovery client, requesting info from %q\n", bootstrapConfig.Clusters[clusterName].Server)
var clusterinfo *v1.ConfigMap
wait.PollInfinite(constants.DiscoveryRetryInterval, func() (bool, error) {
wait.PollImmediateInfinite(constants.DiscoveryRetryInterval, func() (bool, error) {
var err error
clusterinfo, err = client.CoreV1().ConfigMaps(metav1.NamespacePublic).Get(bootstrapapi.ConfigMapClusterInfo, metav1.GetOptions{})
if err != nil {