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Merge pull request #101280 from huffmanca/address-snapshotting-flakes

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Force NodeUnstageVolume to finish for all distros
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Kubernetes Prow Robot 2021-04-22 02:32:31 -07:00 committed by GitHub
commit 82d8d08c78
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1 changed files with 21 additions and 21 deletions
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12
test/e2e/storage/testsuites/snapshottable.go
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@ -164,22 +164,23 @@ func (s *snapshottableTestSuite) DefineTests(driver storageframework.TestDriver,
// - a pod was created with a PV that's supposed to have data // - a pod was created with a PV that's supposed to have data
// //
// However there's a caching issue that @jinxu97 explained and it's related with the pod & volume // However there's a caching issue that @jinxu97 explained and it's related with the pod & volume
// lifecycle in windows, to understand it we first analyze what the volumemanager does: // lifecycle, to understand it we first analyze what the volumemanager does:
// - when a pod is delete the volumemanager will try to cleanup the volume mounts // - when a pod is delete the volumemanager will try to cleanup the volume mounts
// - NodeUnpublishVolume: unbinds the bind mount from the container // - NodeUnpublishVolume: unbinds the bind mount from the container
// - Linux: the data is flushed to disk // - Linux: the bind mount is removed, which does not flush any cache
// - Windows: we delete a symlink, data's not flushed yet to disk // - Windows: we delete a symlink, data's not flushed yet to disk
// - NodeUnstageVolume: unmount the global mount // - NodeUnstageVolume: unmount the global mount
// - Linux: disk is detached // - Linux: disk is unmounted and all caches flushed.
// - Windows: data is flushed to disk and the disk is detached // - Windows: data is flushed to disk and the disk is detached
// //
// Pod deletion might not guarantee a data flush to disk, however NodeUnstageVolume adds the logic // Pod deletion might not guarantee a data flush to disk, however NodeUnstageVolume adds the logic
// to flush the data to disk (see #81690 for details). // to flush the data to disk (see #81690 for details). We need to wait for NodeUnstageVolume, as
// NodeUnpublishVolume only removes the bind mount, which doesn't force the caches to flush.
// It's possible to create empty snapshots if we don't wait (see #101279 for details).
// //
// In the following code by checking if the PV is not in the node.Status.VolumesInUse field we // In the following code by checking if the PV is not in the node.Status.VolumesInUse field we
// ensure that the volume is not used by the node anymore (an indicator that NodeUnstageVolume has // ensure that the volume is not used by the node anymore (an indicator that NodeUnstageVolume has
// already finished) // already finished)
if framework.NodeOSDistroIs("windows") {
nodeName := pod.Spec.NodeName nodeName := pod.Spec.NodeName
gomega.Expect(nodeName).NotTo(gomega.BeEmpty(), "pod.Spec.NodeName must not be empty") gomega.Expect(nodeName).NotTo(gomega.BeEmpty(), "pod.Spec.NodeName must not be empty")
@ -198,7 +199,6 @@ func (s *snapshottableTestSuite) DefineTests(driver storageframework.TestDriver,
}) })
framework.ExpectEqual(success, true) framework.ExpectEqual(success, true)
} }
}
cleanup := func() { cleanup := func() {
// Don't register an AfterEach then a cleanup step because the order // Don't register an AfterEach then a cleanup step because the order