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open-nomad/scheduler/preemption_test.go

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package scheduler
import (
"testing"
"fmt"
"github.com/hashicorp/nomad/helper/uuid"
"github.com/hashicorp/nomad/nomad/mock"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/stretchr/testify/require"
)
func TestResourceDistance(t *testing.T) {
resourceAsk := &structs.ComparableResources{
Flattened: structs.AllocatedTaskResources{
Cpu: structs.AllocatedCpuResources{
CpuShares: 2048,
},
Memory: structs.AllocatedMemoryResources{
MemoryMB: 512,
},
Networks: []*structs.NetworkResource{
{
Device: "eth0",
MBits: 1024,
},
},
},
Shared: structs.AllocatedSharedResources{
DiskMB: 4096,
},
}
type testCase struct {
allocResource *structs.ComparableResources
expectedDistance string
}
testCases := []*testCase{
{
&structs.ComparableResources{
Flattened: structs.AllocatedTaskResources{
Cpu: structs.AllocatedCpuResources{
CpuShares: 2048,
},
Memory: structs.AllocatedMemoryResources{
MemoryMB: 512,
},
Networks: []*structs.NetworkResource{
{
Device: "eth0",
MBits: 1024,
},
},
},
Shared: structs.AllocatedSharedResources{
DiskMB: 4096,
},
},
"0.000",
},
{
&structs.ComparableResources{
Flattened: structs.AllocatedTaskResources{
Cpu: structs.AllocatedCpuResources{
CpuShares: 1024,
},
Memory: structs.AllocatedMemoryResources{
MemoryMB: 400,
},
Networks: []*structs.NetworkResource{
{
Device: "eth0",
MBits: 1024,
},
},
},
Shared: structs.AllocatedSharedResources{
DiskMB: 1024,
},
},
"0.928",
},
{
&structs.ComparableResources{
Flattened: structs.AllocatedTaskResources{
Cpu: structs.AllocatedCpuResources{
CpuShares: 8192,
},
Memory: structs.AllocatedMemoryResources{
MemoryMB: 200,
},
Networks: []*structs.NetworkResource{
{
Device: "eth0",
MBits: 512,
},
},
},
Shared: structs.AllocatedSharedResources{
DiskMB: 1024,
},
},
"3.152",
},
{
&structs.ComparableResources{
Flattened: structs.AllocatedTaskResources{
Cpu: structs.AllocatedCpuResources{
CpuShares: 2048,
},
Memory: structs.AllocatedMemoryResources{
MemoryMB: 500,
},
Networks: []*structs.NetworkResource{
{
Device: "eth0",
MBits: 1024,
},
},
},
Shared: structs.AllocatedSharedResources{
DiskMB: 4096,
},
},
"0.023",
},
}
for _, tc := range testCases {
t.Run("", func(t *testing.T) {
require := require.New(t)
actualDistance := fmt.Sprintf("%3.3f", basicResourceDistance(resourceAsk, tc.allocResource))
require.Equal(tc.expectedDistance, actualDistance)
})
}
}
func TestPreemption(t *testing.T) {
type testCase struct {
desc string
currentAllocations []*structs.Allocation
nodeReservedCapacity *structs.Resources
nodeCapacity *structs.Resources
resourceAsk *structs.Resources
jobPriority int
currentPreemptions []*structs.Allocation
preemptedAllocIDs map[string]struct{}
}
highPrioJob := mock.Job()
highPrioJob.Priority = 100
lowPrioJob := mock.Job()
lowPrioJob.Priority = 30
lowPrioJob2 := mock.Job()
lowPrioJob2.Priority = 30
// Create some persistent alloc ids to use in test cases
allocIDs := []string{uuid.Generate(), uuid.Generate(), uuid.Generate(), uuid.Generate(), uuid.Generate()}
nodeResources := &structs.Resources{
CPU: 4000,
MemoryMB: 8192,
DiskMB: 100 * 1024,
IOPS: 150,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
CIDR: "192.168.0.100/32",
MBits: 1000,
},
},
}
reservedNodeResources := &structs.Resources{
CPU: 100,
MemoryMB: 256,
DiskMB: 4 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
ReservedPorts: []structs.Port{{Label: "ssh", Value: 22}},
MBits: 1,
},
},
}
testCases := []testCase{
{
desc: "No preemption because existing allocs are not low priority",
currentAllocations: []*structs.Allocation{
createAlloc(allocIDs[0], highPrioJob, &structs.Resources{
CPU: 3200,
MemoryMB: 7256,
DiskMB: 4 * 1024,
IOPS: 150,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 50,
},
},
})},
nodeReservedCapacity: reservedNodeResources,
nodeCapacity: nodeResources,
jobPriority: 100,
resourceAsk: &structs.Resources{
CPU: 2000,
MemoryMB: 256,
DiskMB: 4 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
ReservedPorts: []structs.Port{{Label: "ssh", Value: 22}},
MBits: 1,
},
},
},
},
{
desc: "Preempting low priority allocs not enough to meet resource ask",
currentAllocations: []*structs.Allocation{
createAlloc(allocIDs[0], lowPrioJob, &structs.Resources{
CPU: 3200,
MemoryMB: 7256,
DiskMB: 4 * 1024,
IOPS: 150,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 50,
},
},
})},
nodeReservedCapacity: reservedNodeResources,
nodeCapacity: nodeResources,
jobPriority: 100,
resourceAsk: &structs.Resources{
CPU: 4000,
MemoryMB: 8192,
DiskMB: 4 * 1024,
IOPS: 300,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
ReservedPorts: []structs.Port{{Label: "ssh", Value: 22}},
MBits: 1,
},
},
},
},
{
desc: "preemption impossible - static port needed is used by higher priority alloc",
currentAllocations: []*structs.Allocation{
createAlloc(allocIDs[0], highPrioJob, &structs.Resources{
CPU: 1200,
MemoryMB: 2256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 150,
},
},
}),
createAlloc(allocIDs[1], highPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.200",
MBits: 600,
ReservedPorts: []structs.Port{
{
Label: "db",
Value: 88,
},
},
},
},
}),
},
nodeReservedCapacity: reservedNodeResources,
nodeCapacity: nodeResources,
jobPriority: 100,
resourceAsk: &structs.Resources{
CPU: 600,
MemoryMB: 1000,
DiskMB: 25 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 700,
ReservedPorts: []structs.Port{
{
Label: "db",
Value: 88,
},
},
},
},
},
},
{
desc: "Combination of high/low priority allocs, without static ports",
currentAllocations: []*structs.Allocation{
createAlloc(allocIDs[0], highPrioJob, &structs.Resources{
CPU: 2800,
MemoryMB: 2256,
DiskMB: 4 * 1024,
IOPS: 150,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 150,
},
},
}),
createAlloc(allocIDs[1], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.200",
MBits: 500,
},
},
}),
createAlloc(allocIDs[2], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 300,
},
},
}),
createAlloc(allocIDs[3], lowPrioJob, &structs.Resources{
CPU: 700,
MemoryMB: 256,
DiskMB: 4 * 1024,
}),
},
nodeReservedCapacity: reservedNodeResources,
nodeCapacity: nodeResources,
jobPriority: 100,
resourceAsk: &structs.Resources{
CPU: 1100,
MemoryMB: 1000,
DiskMB: 25 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 840,
},
},
},
preemptedAllocIDs: map[string]struct{}{
allocIDs[1]: {},
allocIDs[2]: {},
allocIDs[3]: {},
},
},
{
desc: "Preemption needed for all resources except network",
currentAllocations: []*structs.Allocation{
createAlloc(allocIDs[0], highPrioJob, &structs.Resources{
CPU: 2800,
MemoryMB: 2256,
DiskMB: 40 * 1024,
IOPS: 100,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 150,
},
},
}),
createAlloc(allocIDs[1], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.200",
MBits: 50,
},
},
}),
createAlloc(allocIDs[2], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 512,
DiskMB: 25 * 1024,
}),
createAlloc(allocIDs[3], lowPrioJob, &structs.Resources{
CPU: 700,
MemoryMB: 276,
DiskMB: 20 * 1024,
}),
},
nodeReservedCapacity: reservedNodeResources,
nodeCapacity: nodeResources,
jobPriority: 100,
resourceAsk: &structs.Resources{
CPU: 1000,
MemoryMB: 3000,
DiskMB: 50 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 50,
},
},
},
preemptedAllocIDs: map[string]struct{}{
allocIDs[1]: {},
allocIDs[2]: {},
allocIDs[3]: {},
},
},
{
desc: "Only one low priority alloc needs to be preempted",
currentAllocations: []*structs.Allocation{
createAlloc(allocIDs[0], highPrioJob, &structs.Resources{
CPU: 1200,
MemoryMB: 2256,
DiskMB: 4 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 150,
},
},
}),
createAlloc(allocIDs[1], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 500,
},
},
}),
createAlloc(allocIDs[2], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.200",
MBits: 320,
},
},
}),
},
nodeReservedCapacity: reservedNodeResources,
nodeCapacity: nodeResources,
jobPriority: 100,
resourceAsk: &structs.Resources{
CPU: 300,
MemoryMB: 500,
DiskMB: 5 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 320,
},
},
},
preemptedAllocIDs: map[string]struct{}{
allocIDs[2]: {},
},
},
{
desc: "one alloc meets static port need, another meets remaining mbits needed",
currentAllocations: []*structs.Allocation{
createAlloc(allocIDs[0], highPrioJob, &structs.Resources{
CPU: 1200,
MemoryMB: 2256,
DiskMB: 4 * 1024,
IOPS: 150,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 150,
},
},
}),
createAlloc(allocIDs[1], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.200",
MBits: 500,
ReservedPorts: []structs.Port{
{
Label: "db",
Value: 88,
},
},
},
},
}),
createAlloc(allocIDs[2], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 200,
},
},
}),
},
nodeReservedCapacity: reservedNodeResources,
nodeCapacity: nodeResources,
jobPriority: 100,
resourceAsk: &structs.Resources{
CPU: 2700,
MemoryMB: 1000,
DiskMB: 25 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 800,
ReservedPorts: []structs.Port{
{
Label: "db",
Value: 88,
},
},
},
},
},
preemptedAllocIDs: map[string]struct{}{
allocIDs[1]: {},
allocIDs[2]: {},
},
},
{
desc: "alloc that meets static port need also meets other needs",
currentAllocations: []*structs.Allocation{
createAlloc(allocIDs[0], highPrioJob, &structs.Resources{
CPU: 1200,
MemoryMB: 2256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 150,
},
},
}),
createAlloc(allocIDs[1], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.200",
MBits: 600,
ReservedPorts: []structs.Port{
{
Label: "db",
Value: 88,
},
},
},
},
}),
createAlloc(allocIDs[2], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 100,
},
},
}),
},
nodeReservedCapacity: reservedNodeResources,
nodeCapacity: nodeResources,
jobPriority: 100,
resourceAsk: &structs.Resources{
CPU: 600,
MemoryMB: 1000,
DiskMB: 25 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 700,
ReservedPorts: []structs.Port{
{
Label: "db",
Value: 88,
},
},
},
},
},
preemptedAllocIDs: map[string]struct{}{
allocIDs[1]: {},
},
},
{
desc: "alloc from job that has existing evictions not chosen for preemption",
currentAllocations: []*structs.Allocation{
createAlloc(allocIDs[0], highPrioJob, &structs.Resources{
CPU: 1200,
MemoryMB: 2256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 150,
},
},
}),
createAlloc(allocIDs[1], lowPrioJob, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 10,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.200",
MBits: 500,
},
},
}),
createAlloc(allocIDs[2], lowPrioJob2, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 10,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 300,
},
},
}),
},
nodeReservedCapacity: reservedNodeResources,
nodeCapacity: nodeResources,
jobPriority: 100,
resourceAsk: &structs.Resources{
CPU: 300,
MemoryMB: 500,
DiskMB: 5 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 320,
},
},
},
currentPreemptions: []*structs.Allocation{
createAlloc(allocIDs[4], lowPrioJob2, &structs.Resources{
CPU: 200,
MemoryMB: 256,
DiskMB: 4 * 1024,
IOPS: 10,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 300,
},
},
}),
},
preemptedAllocIDs: map[string]struct{}{
allocIDs[1]: {},
},
},
// This test case exercises the code path for a final filtering step that tries to
// minimize the number of preemptible allocations
{
desc: "Filter out allocs whose resource usage superset is also in the preemption list",
currentAllocations: []*structs.Allocation{
createAlloc(allocIDs[0], highPrioJob, &structs.Resources{
CPU: 1800,
MemoryMB: 2256,
DiskMB: 4 * 1024,
IOPS: 50,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 150,
},
},
}),
createAlloc(allocIDs[1], lowPrioJob, &structs.Resources{
CPU: 1500,
MemoryMB: 256,
DiskMB: 5 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 100,
},
},
}),
createAlloc(allocIDs[2], lowPrioJob, &structs.Resources{
CPU: 600,
MemoryMB: 256,
DiskMB: 5 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.200",
MBits: 300,
},
},
}),
},
nodeReservedCapacity: reservedNodeResources,
nodeCapacity: nodeResources,
jobPriority: 100,
resourceAsk: &structs.Resources{
CPU: 1000,
MemoryMB: 256,
DiskMB: 5 * 1024,
Networks: []*structs.NetworkResource{
{
Device: "eth0",
IP: "192.168.0.100",
MBits: 50,
},
},
},
preemptedAllocIDs: map[string]struct{}{
allocIDs[1]: {},
},
},
}
for _, tc := range testCases {
t.Run(tc.desc, func(t *testing.T) {
node := mock.Node()
node.Resources = tc.nodeCapacity
node.Reserved = tc.nodeReservedCapacity
state, ctx := testContext(t)
nodes := []*RankedNode{
{
Node: node,
},
}
state.UpsertNode(1000, node)
for _, alloc := range tc.currentAllocations {
alloc.NodeID = node.ID
}
require := require.New(t)
err := state.UpsertAllocs(1001, tc.currentAllocations)
require.Nil(err)
if tc.currentPreemptions != nil {
ctx.plan.NodePreemptions[node.ID] = tc.currentPreemptions
}
static := NewStaticRankIterator(ctx, nodes)
binPackIter := NewBinPackIterator(ctx, static, true, tc.jobPriority)
taskGroup := &structs.TaskGroup{
EphemeralDisk: &structs.EphemeralDisk{},
Tasks: []*structs.Task{
{
Name: "web",
Resources: tc.resourceAsk,
},
},
}
binPackIter.SetTaskGroup(taskGroup)
option := binPackIter.Next()
if tc.preemptedAllocIDs == nil {
require.Nil(option)
} else {
require.NotNil(option)
preemptedAllocs := option.PreemptedAllocs
require.Equal(len(tc.preemptedAllocIDs), len(preemptedAllocs))
for _, alloc := range preemptedAllocs {
_, ok := tc.preemptedAllocIDs[alloc.ID]
require.True(ok)
}
}
})
}
}
// helper method to create allocations with given jobs and resources
func createAlloc(id string, job *structs.Job, resource *structs.Resources) *structs.Allocation {
alloc := &structs.Allocation{
ID: id,
Job: job,
JobID: job.ID,
TaskResources: map[string]*structs.Resources{
"web": resource,
},
Resources: resource,
Namespace: structs.DefaultNamespace,
EvalID: uuid.Generate(),
DesiredStatus: structs.AllocDesiredStatusRun,
ClientStatus: structs.AllocClientStatusRunning,
TaskGroup: "web",
}
return alloc
}
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