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Merge pull request #87696 from liggitt/node2

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Switch node authorizer indexes to reference counts, add fastpath edge removal
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Kubernetes Prow Robot 2020-02-10 12:45:54 -08:00 committed by GitHub
commit 7a506ff342
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4 changed files with 121 additions and 100 deletions
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69
plugin/pkg/auth/authorizer/node/graph.go
View File

@ -175,7 +175,7 @@ func (g *Graph) deleteVertex_locked(vertexType vertexType, namespace, name strin
// find existing neighbors with a single edge (meaning we are their only neighbor)
neighborsToRemove := []graph.Node{}
neighborsToRecompute := []graph.Node{}
edgesToRemoveFromIndexes := []graph.Edge{}
g.graph.VisitFrom(vertex, func(neighbor graph.Node) bool {
// this downstream neighbor has only one edge (which must be from us), so remove them as well
if g.graph.Degree(neighbor) == 1 {
@ -188,8 +188,8 @@ func (g *Graph) deleteVertex_locked(vertexType vertexType, namespace, name strin
// this upstream neighbor has only one edge (which must be to us), so remove them as well
neighborsToRemove = append(neighborsToRemove, neighbor)
} else {
// recompute the destination edge index on this neighbor
neighborsToRecompute = append(neighborsToRecompute, neighbor)
// decrement the destination edge index on this neighbor if the edge between us was a destination edge
edgesToRemoveFromIndexes = append(edgesToRemoveFromIndexes, g.graph.EdgeBetween(vertex, neighbor))
}
return true
})
@ -202,9 +202,9 @@ func (g *Graph) deleteVertex_locked(vertexType vertexType, namespace, name strin
g.removeVertex_locked(neighbor.(*namedVertex))
}
// recompute destination indexes for neighbors that dropped outbound edges
for _, neighbor := range neighborsToRecompute {
g.recomputeDestinationIndex_locked(neighbor)
// remove edges from destination indexes for neighbors that dropped outbound edges
for _, edge := range edgesToRemoveFromIndexes {
g.removeEdgeFromDestinationIndex_locked(edge)
}
}
@ -220,19 +220,17 @@ func (g *Graph) deleteEdges_locked(fromType, toType vertexType, toNamespace, toN
// delete all edges between vertices of fromType and toVert
neighborsToRemove := []*namedVertex{}
neighborsToRecompute := []*namedVertex{}
edgesToRemove := []graph.Edge{}
g.graph.VisitTo(toVert, func(from graph.Node) bool {
fromVert := from.(*namedVertex)
if fromVert.vertexType != fromType {
return true
}
// remove the edge
g.graph.RemoveEdge(simple.Edge{F: fromVert, T: toVert})
// track vertexes that changed edges
if g.graph.Degree(fromVert) == 0 {
// this neighbor has only one edge (which must be to us), so remove them as well
if g.graph.Degree(fromVert) == 1 {
neighborsToRemove = append(neighborsToRemove, fromVert)
} else {
neighborsToRecompute = append(neighborsToRecompute, fromVert)
edgesToRemove = append(edgesToRemove, g.graph.EdgeBetween(from, toVert))
}
return true
})
@ -242,9 +240,30 @@ func (g *Graph) deleteEdges_locked(fromType, toType vertexType, toNamespace, toN
g.removeVertex_locked(v)
}
// recompute destination indexes for neighbors that dropped outbound edges
for _, v := range neighborsToRecompute {
g.recomputeDestinationIndex_locked(v)
// remove edges and decrement destination indexes for neighbors that dropped outbound edges
for _, edge := range edgesToRemove {
g.graph.RemoveEdge(edge)
g.removeEdgeFromDestinationIndex_locked(edge)
}
}
// A fastpath for recomputeDestinationIndex_locked for "removing edge" case.
func (g *Graph) removeEdgeFromDestinationIndex_locked(e graph.Edge) {
n := e.From()
// don't maintain indices for nodes with few edges
edgeCount := g.graph.Degree(n)
if edgeCount < g.destinationEdgeThreshold {
delete(g.destinationEdgeIndex, n.ID())
return
}
// decrement the nodeID->destinationID refcount in the index, if the index exists
index := g.destinationEdgeIndex[n.ID()]
if index == nil {
return
}
if destinationEdge, ok := e.(*destinationEdge); ok {
index.decrement(destinationEdge.DestinationID())
}
}
@ -259,7 +278,7 @@ func (g *Graph) addEdgeToDestinationIndex_locked(e graph.Edge) {
}
// fast-add the new edge to an existing index
if destinationEdge, ok := e.(*destinationEdge); ok {
index.mark(destinationEdge.DestinationID())
index.increment(destinationEdge.DestinationID())
}
}
@ -290,25 +309,17 @@ func (g *Graph) recomputeDestinationIndex_locked(n graph.Node) {
if index == nil {
index = newIntSet()
} else {
index.startNewGeneration()
index.reset()
}
// populate the index
g.graph.VisitFrom(n, func(dest graph.Node) bool {
if destinationEdge, ok := g.graph.EdgeBetween(n, dest).(*destinationEdge); ok {
index.mark(destinationEdge.DestinationID())
index.increment(destinationEdge.DestinationID())
}
return true
})
// remove existing items no longer in the list
index.sweep()
if len(index.members) < g.destinationEdgeThreshold {
delete(g.destinationEdgeIndex, n.ID())
} else {
g.destinationEdgeIndex[n.ID()] = index
}
g.destinationEdgeIndex[n.ID()] = index
}
// AddPod should only be called once spec.NodeName is populated.
@ -451,7 +462,9 @@ func (g *Graph) SetNodeConfigMap(nodeName, configMapName, configMapNamespace str
if len(configMapName) > 0 && len(configMapNamespace) > 0 {
configmapVertex := g.getOrCreateVertex_locked(configMapVertexType, configMapNamespace, configMapName)
nodeVertex := g.getOrCreateVertex_locked(nodeVertexType, "", nodeName)
g.graph.SetEdge(newDestinationEdge(configmapVertex, nodeVertex, nodeVertex))
e := newDestinationEdge(configmapVertex, nodeVertex, nodeVertex)
g.graph.SetEdge(e)
g.addEdgeToDestinationIndex_locked(e)
}
}

61
plugin/pkg/auth/authorizer/node/graph_test.go
View File

@ -247,8 +247,8 @@ func TestIndex(t *testing.T) {
actual := map[string][]string{}
for from, to := range g.destinationEdgeIndex {
sortedValues := []string{}
for member := range to.members {
sortedValues = append(sortedValues, toString(member))
for member, count := range to.members {
sortedValues = append(sortedValues, fmt.Sprintf("%s=%d", toString(member), count))
}
sort.Strings(sortedValues)
actual[toString(from)] = sortedValues
@ -280,10 +280,10 @@ func TestIndex(t *testing.T) {
"serviceAccount:ns/sa1": {"pod:ns/pod1", "pod:ns/pod2", "pod:ns/pod3"},
})
expectIndex(map[string][]string{
"configmap:ns/cm1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm2": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm3": {"node:node1", "node:node2", "node:node3"},
"serviceAccount:ns/sa1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm1": {"node:node1=1", "node:node2=1", "node:node3=1"},
"configmap:ns/cm2": {"node:node1=1", "node:node2=1", "node:node3=1"},
"configmap:ns/cm3": {"node:node1=1", "node:node2=1", "node:node3=1"},
"serviceAccount:ns/sa1": {"node:node1=1", "node:node2=1", "node:node3=1"},
})
// delete one to drop below the threshold
@ -317,10 +317,10 @@ func TestIndex(t *testing.T) {
"serviceAccount:ns/sa1": {"pod:ns/pod1", "pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
})
expectIndex(map[string][]string{
"configmap:ns/cm1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm2": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm3": {"node:node1", "node:node2", "node:node3"},
"serviceAccount:ns/sa1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm1": {"node:node1=2", "node:node2=1", "node:node3=1"},
"configmap:ns/cm2": {"node:node1=2", "node:node2=1", "node:node3=1"},
"configmap:ns/cm3": {"node:node1=2", "node:node2=1", "node:node3=1"},
"serviceAccount:ns/sa1": {"node:node1=2", "node:node2=1", "node:node3=1"},
})
// delete one to remain above the threshold
@ -338,33 +338,35 @@ func TestIndex(t *testing.T) {
"serviceAccount:ns/sa1": {"pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
})
expectIndex(map[string][]string{
"configmap:ns/cm1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm2": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm3": {"node:node1", "node:node2", "node:node3"},
"serviceAccount:ns/sa1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm1": {"node:node1=1", "node:node2=1", "node:node3=1"},
"configmap:ns/cm2": {"node:node1=1", "node:node2=1", "node:node3=1"},
"configmap:ns/cm3": {"node:node1=1", "node:node2=1", "node:node3=1"},
"serviceAccount:ns/sa1": {"node:node1=1", "node:node2=1", "node:node3=1"},
})
// Set node->configmap references
g.SetNodeConfigMap("node1", "cm1", "ns")
g.SetNodeConfigMap("node2", "cm1", "ns")
g.SetNodeConfigMap("node3", "cm1", "ns")
g.SetNodeConfigMap("node4", "cm1", "ns")
expectGraph(map[string][]string{
"node:node1": {},
"node:node2": {},
"node:node3": {},
"node:node4": {},
"pod:ns/pod2": {"node:node2"},
"pod:ns/pod3": {"node:node3"},
"pod:ns/pod4": {"node:node1"},
"configmap:ns/cm1": {"node:node1", "node:node2", "node:node3", "pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
"configmap:ns/cm1": {"node:node1", "node:node2", "node:node3", "node:node4", "pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
"configmap:ns/cm2": {"pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
"configmap:ns/cm3": {"pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
"serviceAccount:ns/sa1": {"pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
})
expectIndex(map[string][]string{
"configmap:ns/cm1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm2": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm3": {"node:node1", "node:node2", "node:node3"},
"serviceAccount:ns/sa1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm1": {"node:node1=2", "node:node2=2", "node:node3=2", "node:node4=1"},
"configmap:ns/cm2": {"node:node1=1", "node:node2=1", "node:node3=1"},
"configmap:ns/cm3": {"node:node1=1", "node:node2=1", "node:node3=1"},
"serviceAccount:ns/sa1": {"node:node1=1", "node:node2=1", "node:node3=1"},
})
// Update node->configmap reference
@ -373,27 +375,30 @@ func TestIndex(t *testing.T) {
"node:node1": {},
"node:node2": {},
"node:node3": {},
"node:node4": {},
"pod:ns/pod2": {"node:node2"},
"pod:ns/pod3": {"node:node3"},
"pod:ns/pod4": {"node:node1"},
"configmap:ns/cm1": {"node:node2", "node:node3", "pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
"configmap:ns/cm1": {"node:node2", "node:node3", "node:node4", "pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
"configmap:ns/cm2": {"node:node1", "pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
"configmap:ns/cm3": {"pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
"serviceAccount:ns/sa1": {"pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
})
expectIndex(map[string][]string{
"configmap:ns/cm1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm2": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm3": {"node:node1", "node:node2", "node:node3"},
"serviceAccount:ns/sa1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm1": {"node:node1=1", "node:node2=2", "node:node3=2", "node:node4=1"},
"configmap:ns/cm2": {"node:node1=2", "node:node2=1", "node:node3=1"},
"configmap:ns/cm3": {"node:node1=1", "node:node2=1", "node:node3=1"},
"serviceAccount:ns/sa1": {"node:node1=1", "node:node2=1", "node:node3=1"},
})
// Remove node->configmap reference
g.SetNodeConfigMap("node1", "", "")
g.SetNodeConfigMap("node4", "", "")
expectGraph(map[string][]string{
"node:node1": {},
"node:node2": {},
"node:node3": {},
"node:node4": {},
"pod:ns/pod2": {"node:node2"},
"pod:ns/pod3": {"node:node3"},
"pod:ns/pod4": {"node:node1"},
@ -403,9 +408,9 @@ func TestIndex(t *testing.T) {
"serviceAccount:ns/sa1": {"pod:ns/pod2", "pod:ns/pod3", "pod:ns/pod4"},
})
expectIndex(map[string][]string{
"configmap:ns/cm1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm2": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm3": {"node:node1", "node:node2", "node:node3"},
"serviceAccount:ns/sa1": {"node:node1", "node:node2", "node:node3"},
"configmap:ns/cm1": {"node:node1=1", "node:node2=2", "node:node3=2"},
"configmap:ns/cm2": {"node:node1=1", "node:node2=1", "node:node3=1"},
"configmap:ns/cm3": {"node:node1=1", "node:node2=1", "node:node3=1"},
"serviceAccount:ns/sa1": {"node:node1=1", "node:node2=1", "node:node3=1"},
})
}

56
plugin/pkg/auth/authorizer/node/intset.go
View File

@ -16,47 +16,47 @@ limitations under the License.
package node
// intSet maintains a set of ints, and supports promoting and culling the previous generation.
// this allows tracking a large, mostly-stable set without constantly reallocating the entire set.
// intSet maintains a map of id to refcounts
type intSet struct {
currentGeneration byte
members map[int]byte
// members is a map of id to refcounts
members map[int]int
}
func newIntSet() *intSet {
return &intSet{members: map[int]byte{}}
return &intSet{members: map[int]int{}}
}
// has returns true if the specified int is in the set.
// has returns true if the specified id has a positive refcount.
// it is safe to call concurrently, but must not be called concurrently with any of the other methods.
func (s *intSet) has(i int) bool {
if s == nil {
return false
}
_, present := s.members[i]
return present
return s.members[i] > 0
}
// startNewGeneration begins a new generation.
// it must be followed by a call to mark() for every member of the generation,
// then a call to sweep() to remove members not present in the generation.
// reset removes all ids, effectively setting their refcounts to 0.
// it is not thread-safe.
func (s *intSet) startNewGeneration() {
s.currentGeneration++
}
// mark indicates the specified int belongs to the current generation.
// it is not thread-safe.
func (s *intSet) mark(i int) {
s.members[i] = s.currentGeneration
}
// sweep removes items not in the current generation.
// it is not thread-safe.
func (s *intSet) sweep() {
for k, v := range s.members {
if v != s.currentGeneration {
delete(s.members, k)
}
func (s *intSet) reset() {
for k := range s.members {
delete(s.members, k)
}
}
// increment adds one to the refcount of the specified id.
// it is not thread-safe.
func (s *intSet) increment(i int) {
s.members[i]++
}
// decrement removes one from the refcount of the specified id,
// and removes the id if the resulting refcount is <= 0.
// it will not track refcounts lower than zero.
// it is not thread-safe.
func (s *intSet) decrement(i int) {
if s.members[i] <= 1 {
delete(s.members, i)
} else {
s.members[i]--
}
}

35
plugin/pkg/auth/authorizer/node/intset_test.go
View File

@ -30,33 +30,36 @@ func TestIntSet(t *testing.T) {
assert.False(t, i.has(3))
assert.False(t, i.has(4))
i.startNewGeneration()
i.mark(1)
i.mark(2)
i.sweep()
i.reset()
i.increment(1) // to 1
i.increment(2) // to 1
assert.True(t, i.has(1))
assert.True(t, i.has(2))
assert.False(t, i.has(3))
assert.False(t, i.has(4))
i.startNewGeneration()
i.mark(2)
i.mark(3)
i.sweep()
i.decrement(1) // to 0
i.increment(3) // to 1
assert.False(t, i.has(1))
assert.True(t, i.has(2))
assert.True(t, i.has(3))
assert.False(t, i.has(4))
assert.False(t, i.has(1)) // removed
assert.True(t, i.has(2)) // still present
assert.True(t, i.has(3)) // added
assert.False(t, i.has(4)) // not yet present
i.startNewGeneration()
i.mark(3)
i.mark(4)
i.sweep()
i.decrement(2) // to 0
i.increment(3) // to 2
i.decrement(3) // to 1
i.increment(4) // to 1
assert.False(t, i.has(1))
assert.False(t, i.has(2))
assert.True(t, i.has(3))
assert.True(t, i.has(4))
i.reset()
assert.False(t, i.has(1))
assert.False(t, i.has(2))
assert.False(t, i.has(3))
assert.False(t, i.has(4))
}