- actual_state_of_world_test.go: test the new method GetVolumesToReportAttachedForNode
for an existing node and a non-existing node
- node_status_updater_test.go: test UpdateNodeStatuses and UpdateNodeStatuses in nominal
case with 2 nodes getting one volume each. Test UpdateNodeStatuses with the first call
to node.patch failing but the following one succeeding
- add comment in node_status_updater.go
- fix log line in reconciler.go
- rename variable in actual_state_of_world.go
The UpdateNodeStatuses code stops too early in case there is
an error when calling updateNodeStatus. It will return immediately
which means any remaining node won't have its update status put back
to true.
Looking at the call sites for UpdateNodeStatuses, it appears this is
not the only issue. If the lister call fails with anything but a Not Found
error, it's silently ignored which is wrong in the detach path.
Also the reconciler detach path calls UpdateNodeStatuses but the real intent
is to only update the node currently processed in the loop and not proceed
with the detach call if there is an error updating that specifi node volumesAttached
property. With the current implementation, it will not proceed if there is
an error updating another node (which is not completely bad but not ideal) and
worse it will proceed if there is a lister error on that node which means the
node volumesAttached property won't have been updated.
To fix those issues, introduce the following changes:
- [node_status_updater] introduce UpdateNodeStatusForNode which does what
UpdateNodeStatuses does but only for the provided node
- [node_status_updater] if the node lister call fails for anything but a Not
Found error, we will return an error, not ignore it
- [node_status_updater] if the update of a node volumesAttached properties fails
we continue processing the other nodes
- [actual_state_of_world] introduce GetVolumesToReportAttachedForNode which
does what GetVolumesToReportAttached but for the node whose name is provided
it returns a bool which indicates if the node in question needs an update as
well as the volumesAttached list. It is used by UpdateNodeStatusForNode
- [actual_state_of_world] use write lock in updateNodeStatusUpdateNeeded, we're
modifying the map content
- [reconciler] use UpdateNodeStatusForNode in the detach loop
In the following code pattern, the log message will get logged with v=0 in JSON
output although conceptually it has a higher verbosity:
if klog.V(5).Enabled() {
klog.Info("hello world")
}
Having the actual verbosity in the JSON output is relevant, for example for
filtering out only the important info messages. The solution is to use
klog.V(5).Info or something similar.
Whether the outer if is necessary at all depends on how complex the parameters
are. The return value of klog.V can be captured in a variable and be used
multiple times to avoid the overhead for that function call and to avoid
repeating the verbosity level.
Test 5-7 tries to delete a PVC at the very same time when it detects that
the PV controller started processing the PVC. The controller then sometimes
can't update the PVC and generate an event for it that the test expects.
From PV controller logs (not shown in CI):
> I1221 14:36:34.548160 104481 pv_controller.go:815] updating PersistentVolumeClaim[default/claim5-7] status: set phase Lost failed: cannot update claim claim5-7: claim not found
Typical error in CI:
> FAIL: TestControllerSync (83.22s)
> framework_test.go:202: Event "Warning ClaimLost" not emitted
Therefore wait for the PVC to be fully processed before deleting the PVC to
avoid races.
Add fake Pod and Node watchers to the tests. It only reduces test noise:
Failed to watch *v1.Pod: unhandled watch: testing.WatchActionImpl{ActionImpl:testing.ActionImpl{Namespace:"", Verb:"watch", Resource:schema.GroupVersionResource{Group:"", Version:"v1", Resource:"pods"}, Subresource:""}, WatchRestrictions:testing.WatchRestrictions{Labels:labels.internalSelector(nil), Fields:fields.andTerm{}, ResourceVersion:""}}
This feature has graduated to GA in v1.11 and will always be
enabled. So no longe need to check if enabled.
Signed-off-by: Konstantin Misyutin <konstantin.misyutin@huawei.com>
As well as feature gate are locked, the tests when this feature is
disabled will crash. So we should remove them together with locking
the feature.
Signed-off-by: Konstantin Misyutin <konstantin.misyutin@huawei.com>
The feature gate gets locked to "true", with the goal to remove it in two
releases.
All code now can assume that the feature is enabled. Tests for "feature
disabled" are no longer needed and get removed.
Some code wasn't using the new helper functions yet. That gets changed while
touching those lines.
The name concatenation and ownership check were originally considered small
enough to not warrant dedicated functions, but the intent of the code is more
readable with them.
There also was a missing owner check in the attach controller.
During volume detach, the following might happen in reconciler
1. Pod is deleting
2. remove volume from reportedAsAttached, so node status updater will
update volumeAttached list
3. detach failed due to some issue
4. volume is added back in reportedAsAttached
5. reconciler loops again the volume, remove volume from
reportedAsAttached
6. detach will not be trigged because exponential back off, detach call
will fail with exponential backoff error
7. another pod is added which using the same volume on the same node
8. reconciler loops and it will NOT try to tigger detach anymore
At this point, volume is still attached and in actual state, but
volumeAttached list in node status does not has this volume anymore, and
will block volume mount from kubelet.
The fix in first round is to add volume back into the volume list that
need to reported as attached at step 6 when detach call failed with
error (exponentical backoff). However this might has some performance
issue if detach fail for a while. During this time, volume will be keep
removing/adding back to node status which will cause a surge of API
calls.
So we changed to logic to check first whether operation is safe to retry which
means no pending operation or it is not in exponentical backoff time
period before calling detach. This way we can avoid keep removing/adding
volume from node status.
Change-Id: I5d4e760c880d72937d34b9d3e904ecad125f802e
This PR adds GA AnnStorageProvisioner annotation to
a PVC if the PVC requires dynamic provisioning. This
also deprecates the beta AnnStorageProvisioner annotation
and it will be removed in a later release.
All dependencies of VolumeBinding plugin from
"k8s.io/kubernetes/pkg/controller/volume/scheduling" package moved to
"k8s.io/kubernetes/pkg/scheduler/framework/plugins/volumebinding" package:
- whole file pkg/controller/volume/scheduling/scheduler_assume_cache.go
- whole file pkg/controller/volume/scheduling/scheduler_assume_cache_test.go
- whole file pkg/controller/volume/scheduling/scheduler_binder.go
- whole file pkg/controller/volume/scheduling/scheduler_binder_fake.go
- whole file pkg/controller/volume/scheduling/scheduler_binder_test.go
Package "k8s.io/kubernetes/pkg/controller/volume/scheduling/metrics" moved
to "k8s.io/kubernetes/pkg/scheduler/framework/plugins/volumebinding/metrics"
because it only used in VolumeBinding plugin and (e2e) tests.
More described in issue #89930 and PR #102953.
Signed-off-by: Konstantin Misyutin <konstantin.misyutin@huawei.com>
As discussed during the alpha review, the ReadOnly field is not really
needed because volume mounts can also be read-only. It's a historical
oddity that can be avoided for generic ephemeral volumes as part
of the promotion to beta.
If available, then the MaximumVolumeSize is a better indicator whether
creating a volume has a chance to succeed than the total (?) Capacity,
which is potentially larger and less well-defined.
Without this error, kube-scheduler was simply ignoring the special
volume source and scheduled the pod. This was unlikely to work in
practice because the volume might have needed binding or the feature
is also disabled on kubelet which then doesn't know what to do with
the volume.
A CounterVector with status as label may create unnecessary overhead
and using the success case with the empty label value wasn't
easy. It's better to have two seperate counters, one for total number
of calls and one for failed calls.
As discussed during the production readiness review, a metric for the
PVC create operations is useful. The "ephemeral_volume" workqueue
metrics were already added in the initial implementation.
The new code follows the example set by the endpoints controller.
When the feature is disabled either in the scheduler or the CSIDriver,
the scheduler is expected to schedule pods without considering whether
storage capacity is available.
The goal of this move is related to issue 89930, to break the dependence
of scheduling plugins on internal helpers. This function can easily move to
component-helpers where it will be used by other components as well.
