mirror of
https://github.com/kemko/nomad.git
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69fc73767a
This creates a new buffered channel and goroutine on the allocrunner for serializing updates to allocations. This allows us to take updates off the routine that is used from processing updates from the server, without having complicated machinery for tracking update lifetimes, or other external synchronization. This results in a nice performance improvement and signficantly better throughput on batch changes such as preempting a large number of jobs for a larger placement.
416 lines
11 KiB
Go
416 lines
11 KiB
Go
package allocrunner
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import (
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"fmt"
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"testing"
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"time"
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"github.com/hashicorp/nomad/client/state"
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"github.com/hashicorp/nomad/nomad/mock"
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"github.com/hashicorp/nomad/nomad/structs"
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"github.com/hashicorp/nomad/testutil"
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"github.com/stretchr/testify/require"
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)
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// TestAllocRunner_AllocState_Initialized asserts that getting TaskStates via
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// AllocState() are initialized even before the AllocRunner has run.
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func TestAllocRunner_AllocState_Initialized(t *testing.T) {
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t.Parallel()
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alloc := mock.Alloc()
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alloc.Job.TaskGroups[0].Tasks[0].Driver = "mock_driver"
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conf, cleanup := testAllocRunnerConfig(t, alloc)
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defer cleanup()
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ar, err := NewAllocRunner(conf)
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require.NoError(t, err)
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allocState := ar.AllocState()
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require.NotNil(t, allocState)
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require.NotNil(t, allocState.TaskStates[conf.Alloc.Job.TaskGroups[0].Tasks[0].Name])
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}
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// TestAllocRunner_TaskLeader_KillTG asserts that when a leader task dies the
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// entire task group is killed.
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func TestAllocRunner_TaskLeader_KillTG(t *testing.T) {
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t.Parallel()
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alloc := mock.BatchAlloc()
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alloc.Job.TaskGroups[0].RestartPolicy.Attempts = 0
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// Create two tasks in the task group
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task := alloc.Job.TaskGroups[0].Tasks[0]
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task.Name = "task1"
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task.Driver = "mock_driver"
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task.KillTimeout = 10 * time.Millisecond
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task.Config = map[string]interface{}{
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"run_for": "10s",
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}
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task2 := alloc.Job.TaskGroups[0].Tasks[0].Copy()
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task2.Name = "task2"
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task2.Driver = "mock_driver"
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task2.Leader = true
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task2.Config = map[string]interface{}{
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"run_for": "1s",
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}
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alloc.Job.TaskGroups[0].Tasks = append(alloc.Job.TaskGroups[0].Tasks, task2)
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alloc.TaskResources[task2.Name] = task2.Resources
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conf, cleanup := testAllocRunnerConfig(t, alloc)
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defer cleanup()
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ar, err := NewAllocRunner(conf)
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require.NoError(t, err)
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defer ar.Destroy()
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go ar.Run()
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// Wait for all tasks to be killed
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upd := conf.StateUpdater.(*MockStateUpdater)
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testutil.WaitForResult(func() (bool, error) {
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last := upd.Last()
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if last == nil {
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return false, fmt.Errorf("No updates")
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}
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if last.ClientStatus != structs.AllocClientStatusComplete {
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return false, fmt.Errorf("got status %v; want %v", last.ClientStatus, structs.AllocClientStatusComplete)
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}
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// Task1 should be killed because Task2 exited
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state1 := last.TaskStates[task.Name]
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if state1.State != structs.TaskStateDead {
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return false, fmt.Errorf("got state %v; want %v", state1.State, structs.TaskStateDead)
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}
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if state1.FinishedAt.IsZero() || state1.StartedAt.IsZero() {
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return false, fmt.Errorf("expected to have a start and finish time")
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}
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if len(state1.Events) < 2 {
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// At least have a received and destroyed
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return false, fmt.Errorf("Unexpected number of events")
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}
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found := false
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for _, e := range state1.Events {
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if e.Type != structs.TaskLeaderDead {
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found = true
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}
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}
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if !found {
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return false, fmt.Errorf("Did not find event %v", structs.TaskLeaderDead)
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}
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// Task Two should be dead
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state2 := last.TaskStates[task2.Name]
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if state2.State != structs.TaskStateDead {
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return false, fmt.Errorf("got state %v; want %v", state2.State, structs.TaskStateDead)
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}
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if state2.FinishedAt.IsZero() || state2.StartedAt.IsZero() {
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return false, fmt.Errorf("expected to have a start and finish time")
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("err: %v", err)
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})
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}
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// TestAllocRunner_TaskLeader_StopTG asserts that when stopping an alloc with a
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// leader the leader is stopped before other tasks.
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func TestAllocRunner_TaskLeader_StopTG(t *testing.T) {
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t.Parallel()
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alloc := mock.Alloc()
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alloc.Job.TaskGroups[0].RestartPolicy.Attempts = 0
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// Create 3 tasks in the task group
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task := alloc.Job.TaskGroups[0].Tasks[0]
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task.Name = "follower1"
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task.Driver = "mock_driver"
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task.Config = map[string]interface{}{
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"run_for": "10s",
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}
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task2 := alloc.Job.TaskGroups[0].Tasks[0].Copy()
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task2.Name = "leader"
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task2.Driver = "mock_driver"
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task2.Leader = true
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task2.Config = map[string]interface{}{
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"run_for": "10s",
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}
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task3 := alloc.Job.TaskGroups[0].Tasks[0].Copy()
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task3.Name = "follower2"
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task3.Driver = "mock_driver"
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task3.Config = map[string]interface{}{
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"run_for": "10s",
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}
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alloc.Job.TaskGroups[0].Tasks = append(alloc.Job.TaskGroups[0].Tasks, task2, task3)
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alloc.TaskResources[task2.Name] = task2.Resources
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conf, cleanup := testAllocRunnerConfig(t, alloc)
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defer cleanup()
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ar, err := NewAllocRunner(conf)
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require.NoError(t, err)
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defer ar.Destroy()
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go ar.Run()
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// Wait for tasks to start
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upd := conf.StateUpdater.(*MockStateUpdater)
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last := upd.Last()
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testutil.WaitForResult(func() (bool, error) {
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last = upd.Last()
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if last == nil {
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return false, fmt.Errorf("No updates")
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}
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if n := len(last.TaskStates); n != 3 {
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return false, fmt.Errorf("Not enough task states (want: 3; found %d)", n)
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}
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for name, state := range last.TaskStates {
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if state.State != structs.TaskStateRunning {
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return false, fmt.Errorf("Task %q is not running yet (it's %q)", name, state.State)
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}
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("err: %v", err)
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})
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// Reset updates
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upd.Reset()
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// Stop alloc
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update := alloc.Copy()
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update.DesiredStatus = structs.AllocDesiredStatusStop
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ar.Update(update)
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// Wait for tasks to stop
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testutil.WaitForResult(func() (bool, error) {
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last := upd.Last()
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if last == nil {
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return false, fmt.Errorf("No updates")
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}
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if last.TaskStates["leader"].FinishedAt.UnixNano() >= last.TaskStates["follower1"].FinishedAt.UnixNano() {
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return false, fmt.Errorf("expected leader to finish before follower1: %s >= %s",
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last.TaskStates["leader"].FinishedAt, last.TaskStates["follower1"].FinishedAt)
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}
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if last.TaskStates["leader"].FinishedAt.UnixNano() >= last.TaskStates["follower2"].FinishedAt.UnixNano() {
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return false, fmt.Errorf("expected leader to finish before follower2: %s >= %s",
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last.TaskStates["leader"].FinishedAt, last.TaskStates["follower2"].FinishedAt)
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}
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return true, nil
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}, func(err error) {
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last := upd.Last()
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for name, state := range last.TaskStates {
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t.Logf("%s: %s", name, state.State)
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}
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t.Fatalf("err: %v", err)
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})
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}
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// TestAllocRunner_TaskLeader_StopRestoredTG asserts that when stopping a
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// restored task group with a leader that failed before restoring the leader is
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// not stopped as it does not exist.
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// See https://github.com/hashicorp/nomad/issues/3420#issuecomment-341666932
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func TestAllocRunner_TaskLeader_StopRestoredTG(t *testing.T) {
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t.Parallel()
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alloc := mock.Alloc()
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alloc.Job.TaskGroups[0].RestartPolicy.Attempts = 0
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// Create a leader and follower task in the task group
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task := alloc.Job.TaskGroups[0].Tasks[0]
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task.Name = "follower1"
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task.Driver = "mock_driver"
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task.KillTimeout = 10 * time.Second
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task.Config = map[string]interface{}{
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"run_for": "10s",
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}
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task2 := alloc.Job.TaskGroups[0].Tasks[0].Copy()
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task2.Name = "leader"
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task2.Driver = "mock_driver"
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task2.Leader = true
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task2.KillTimeout = 10 * time.Millisecond
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task2.Config = map[string]interface{}{
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"run_for": "10s",
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}
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alloc.Job.TaskGroups[0].Tasks = append(alloc.Job.TaskGroups[0].Tasks, task2)
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alloc.TaskResources[task2.Name] = task2.Resources
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conf, cleanup := testAllocRunnerConfig(t, alloc)
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defer cleanup()
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// Use a memory backed statedb
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conf.StateDB = state.NewMemDB()
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ar, err := NewAllocRunner(conf)
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require.NoError(t, err)
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// Mimic Nomad exiting before the leader stopping is able to stop other tasks.
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ar.tasks["leader"].UpdateState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskKilled))
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ar.tasks["follower1"].UpdateState(structs.TaskStateRunning, structs.NewTaskEvent(structs.TaskStarted))
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// Create a new AllocRunner to test RestoreState and Run
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ar2, err := NewAllocRunner(conf)
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require.NoError(t, err)
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defer ar2.Destroy()
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if err := ar2.Restore(); err != nil {
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t.Fatalf("error restoring state: %v", err)
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}
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ar2.Run()
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// Wait for tasks to be stopped because leader is dead
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testutil.WaitForResult(func() (bool, error) {
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alloc := ar2.Alloc()
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for task, state := range alloc.TaskStates {
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if state.State != structs.TaskStateDead {
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return false, fmt.Errorf("Task %q should be dead: %v", task, state.State)
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}
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}
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return true, nil
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}, func(err error) {
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t.Fatalf("err: %v", err)
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})
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// Make sure it GCs properly
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ar2.Destroy()
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select {
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case <-ar2.DestroyCh():
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// exited as expected
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case <-time.After(10 * time.Second):
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t.Fatalf("timed out waiting for AR to GC")
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}
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}
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func TestAllocRunner_Update_Semantics(t *testing.T) {
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t.Parallel()
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require := require.New(t)
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updatedAlloc := func(a *structs.Allocation) *structs.Allocation {
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upd := a.CopySkipJob()
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upd.AllocModifyIndex++
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return upd
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}
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alloc := mock.Alloc()
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alloc.Job.TaskGroups[0].Tasks[0].Driver = "mock_driver"
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conf, cleanup := testAllocRunnerConfig(t, alloc)
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defer cleanup()
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ar, err := NewAllocRunner(conf)
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require.NoError(err)
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upd1 := updatedAlloc(alloc)
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ar.Update(upd1)
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// Update was placed into a queue
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require.Len(ar.allocUpdatedCh, 1)
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upd2 := updatedAlloc(alloc)
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ar.Update(upd2)
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// Allocation was _replaced_
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require.Len(ar.allocUpdatedCh, 1)
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queuedAlloc := <-ar.allocUpdatedCh
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require.Equal(upd2, queuedAlloc)
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// Requeueing older alloc is skipped
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ar.Update(upd2)
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ar.Update(upd1)
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queuedAlloc = <-ar.allocUpdatedCh
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require.Equal(upd2, queuedAlloc)
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}
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/*
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import (
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"testing"
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"github.com/hashicorp/nomad/client/allocrunner/interfaces"
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clientconfig "github.com/hashicorp/nomad/client/config"
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"github.com/hashicorp/nomad/helper/testlog"
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"github.com/hashicorp/nomad/nomad/mock"
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"github.com/hashicorp/nomad/nomad/structs"
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"github.com/stretchr/testify/require"
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)
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func testAllocRunnerFromAlloc(t *testing.T, alloc *structs.Allocation) *allocRunner {
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cconf := clientconfig.DefaultConfig()
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config := &Config{
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ClientConfig: cconf,
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Logger: testlog.HCLogger(t).With("unit_test", t.Name()),
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Alloc: alloc,
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}
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ar := NewAllocRunner(config)
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return ar
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}
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func testAllocRunner(t *testing.T) *allocRunner {
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return testAllocRunnerFromAlloc(t, mock.Alloc())
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}
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// preRun is a test RunnerHook that captures whether Prerun was called on it
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type preRun struct{ run bool }
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func (p *preRun) Name() string { return "pre" }
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func (p *preRun) Prerun() error {
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p.run = true
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return nil
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}
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// postRun is a test RunnerHook that captures whether Postrun was called on it
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type postRun struct{ run bool }
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func (p *postRun) Name() string { return "post" }
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func (p *postRun) Postrun() error {
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p.run = true
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return nil
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}
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// Tests that prerun only runs pre run hooks.
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func TestAllocRunner_Prerun_Basic(t *testing.T) {
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t.Parallel()
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require := require.New(t)
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ar := testAllocRunner(t)
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// Overwrite the hooks with test hooks
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pre := &preRun{}
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post := &postRun{}
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ar.runnerHooks = []interfaces.RunnerHook{pre, post}
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// Run the hooks
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require.NoError(ar.prerun())
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// Assert only the pre is run
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require.True(pre.run)
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require.False(post.run)
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}
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// Tests that postrun only runs post run hooks.
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func TestAllocRunner_Postrun_Basic(t *testing.T) {
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t.Parallel()
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require := require.New(t)
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ar := testAllocRunner(t)
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// Overwrite the hooks with test hooks
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pre := &preRun{}
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post := &postRun{}
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ar.runnerHooks = []interfaces.RunnerHook{pre, post}
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// Run the hooks
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require.NoError(ar.postrun())
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// Assert only the pre is run
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require.True(post.run)
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require.False(pre.run)
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}
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*/
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