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Merge pull request #59005 from hyperbolic2346/mwilson/node-name-fix

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Automatic merge from submit-queue (batch tested with PRs 59053, 59005). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Forcing get_node_name to continue searching for a node name.

There was a race condition where the kubelet was restarting and we were querying the api server for this node. In that case, we may get a valid list of nodes that doesn't include our node. This would cause the code to just raise an exception. Now we wait the full timeout before raising the exception.



**What this PR does / why we need it**:
Fixes a race condition on the get_node_name function inside the kubernetes-worker charm.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
Fixed a race condition inside kubernetes-worker that would result in a temporary error situation.
```
This commit is contained in:
Kubernetes Submit Queue 2018-01-30 13:57:29 -08:00 committed by GitHub
commit 7fe25af6b1
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1 changed files with 17 additions and 18 deletions
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35
cluster/juju/layers/kubernetes-worker/reactive/kubernetes_worker.py
View File

@ -979,31 +979,30 @@ def get_node_name():
while time.time() < deadline:
try:
raw = check_output(cmd)
break
except CalledProcessError:
hookenv.log('Failed to get node name for node %s.'
' Will retry.' % (gethostname()))
time.sleep(1)
else:
msg = 'Failed to get node name for node %s' % gethostname()
raise GetNodeNameFailed(msg)
continue
result = json.loads(raw.decode('utf-8'))
if 'items' in result:
for node in result['items']:
if 'status' not in node:
continue
if 'addresses' not in node['status']:
continue
result = json.loads(raw.decode('utf-8'))
if 'items' in result:
for node in result['items']:
if 'status' not in node:
continue
if 'addresses' not in node['status']:
continue
# find the hostname
for address in node['status']['addresses']:
if address['type'] == 'Hostname':
if address['address'] == gethostname():
return node['metadata']['name']
# find the hostname
for address in node['status']['addresses']:
if address['type'] == 'Hostname':
if address['address'] == gethostname():
return node['metadata']['name']
# if we didn't match, just bail to the next node
break
time.sleep(1)
# if we didn't match, just bail to the next node
break
msg = 'Failed to get node name for node %s' % gethostname()
raise GetNodeNameFailed(msg)