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fix(scheduler): keep succeeded pods visible so completing gangs are not evicted (#2022)
Signed-off-by: Thezone-1 <somoprovobhattacharjee@gmail.com> Co-authored-by: Thezone-1 <somoprovobhattacharjee@gmail.com>
1 parent a72e24d commit 3767c11

6 files changed

Lines changed: 392 additions & 6 deletions

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‎.changes/unreleased/Fixed-20260728-181225.yaml‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,6 @@
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kind: Fixed
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body: stalegangeviction no longer evicts remaining pods of a gang whose pods complete successfully
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time: 2026-07-28T18:12:25.0211683+05:30
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custom:
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Author: Thezone-1
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Issue: "1968"

‎pkg/scheduler/actions/stalegangeviction/stalegangeviction_test.go‎

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Original file line numberDiff line numberDiff line change
@@ -709,6 +709,201 @@ func TestStaleGangEviction(t *testing.T) {
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},
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},
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},
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{
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name: "Gang with a succeeded pod - no evict",
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topology: test_utils.TestTopologyBasic{
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Jobs: []*jobs_fake.TestJobBasic{
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{
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Name: "job-1",
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QueueName: "q-1",
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RootSubGroupSet: jobs_fake.DefaultSubGroup(3),
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Tasks: []*tasks_fake.TestTaskBasic{
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{
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Name: "job-1-0",
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State: pod_status.Succeeded,
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},
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{
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Name: "job-1-1",
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State: pod_status.Running,
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NodeName: "node-1",
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},
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{
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Name: "job-1-2",
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State: pod_status.Running,
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NodeName: "node-1",
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},
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},
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StaleDuration: pointer.Duration(61 * time.Second),
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},
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},
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Nodes: map[string]nodes_fake.TestNodeBasic{
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"node-1": {},
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},
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Queues: []test_utils.TestQueueBasic{
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{
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Name: "q-1",
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ParentQueue: "d-1",
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},
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},
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Departments: []test_utils.TestDepartmentBasic{
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{
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Name: "d-1",
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},
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},
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TaskExpectedResults: map[string]test_utils.TestExpectedResultBasic{
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"job-1-0": {
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Status: pod_status.Succeeded,
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},
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"job-1-1": {
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NodeName: "node-1",
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Status: pod_status.Running,
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},
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"job-1-2": {
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NodeName: "node-1",
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Status: pod_status.Running,
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},
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},
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Mocks: &test_utils.TestMock{
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CacheRequirements: &test_utils.CacheMocking{
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NumberOfCacheBinds: 0,
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NumberOfCacheEvictions: 0,
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NumberOfPipelineActions: 0,
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},
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},
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},
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},
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{
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name: "Gang with only one pod left running - no evict",
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topology: test_utils.TestTopologyBasic{
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Jobs: []*jobs_fake.TestJobBasic{
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{
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Name: "job-1",
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QueueName: "q-1",
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RootSubGroupSet: jobs_fake.DefaultSubGroup(3),
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Tasks: []*tasks_fake.TestTaskBasic{
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{
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Name: "job-1-0",
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State: pod_status.Succeeded,
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},
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{
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Name: "job-1-1",
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State: pod_status.Succeeded,
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},
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{
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Name: "job-1-2",
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State: pod_status.Running,
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NodeName: "node-1",
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},
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},
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StaleDuration: pointer.Duration(61 * time.Second),
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},
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},
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Nodes: map[string]nodes_fake.TestNodeBasic{
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"node-1": {},
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},
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Queues: []test_utils.TestQueueBasic{
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{
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Name: "q-1",
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ParentQueue: "d-1",
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},
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},
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Departments: []test_utils.TestDepartmentBasic{
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{
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Name: "d-1",
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},
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},
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TaskExpectedResults: map[string]test_utils.TestExpectedResultBasic{
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"job-1-0": {
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Status: pod_status.Succeeded,
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},
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"job-1-1": {
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Status: pod_status.Succeeded,
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},
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"job-1-2": {
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NodeName: "node-1",
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Status: pod_status.Running,
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},
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},
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Mocks: &test_utils.TestMock{
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CacheRequirements: &test_utils.CacheMocking{
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NumberOfCacheBinds: 0,
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NumberOfCacheEvictions: 0,
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NumberOfPipelineActions: 0,
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},
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},
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},
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},
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{
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name: "Gang with a succeeded pod in one sub group - no evict",
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topology: test_utils.TestTopologyBasic{
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Jobs: []*jobs_fake.TestJobBasic{
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{
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Name: "job-1",
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QueueName: "q-1",
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RootSubGroupSet: func() *subgroup_info.SubGroupSet {
844+
root := subgroup_info.NewSubGroupSet(subgroup_info.RootSubGroupSetName, nil)
845+
root.AddPodSet(subgroup_info.NewPodSet("sub-group-0", 2, nil))
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root.AddPodSet(subgroup_info.NewPodSet("sub-group-1", 1, nil))
847+
return root
848+
}(),
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Tasks: []*tasks_fake.TestTaskBasic{
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{
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Name: "job-1-0",
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SubGroupName: "sub-group-0",
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State: pod_status.Succeeded,
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},
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{
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Name: "job-1-1",
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SubGroupName: "sub-group-0",
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State: pod_status.Running,
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NodeName: "node-1",
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},
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{
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Name: "job-1-2",
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SubGroupName: "sub-group-1",
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State: pod_status.Running,
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NodeName: "node-1",
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},
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},
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StaleDuration: pointer.Duration(61 * time.Second),
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},
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},
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Nodes: map[string]nodes_fake.TestNodeBasic{
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"node-1": {},
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},
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Queues: []test_utils.TestQueueBasic{
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{
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Name: "q-1",
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ParentQueue: "d-1",
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},
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},
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Departments: []test_utils.TestDepartmentBasic{
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{
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Name: "d-1",
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},
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},
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TaskExpectedResults: map[string]test_utils.TestExpectedResultBasic{
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"job-1-0": {
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Status: pod_status.Succeeded,
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},
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"job-1-1": {
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NodeName: "node-1",
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Status: pod_status.Running,
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},
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"job-1-2": {
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NodeName: "node-1",
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Status: pod_status.Running,
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},
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},
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Mocks: &test_utils.TestMock{
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CacheRequirements: &test_utils.CacheMocking{
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NumberOfCacheBinds: 0,
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NumberOfCacheEvictions: 0,
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NumberOfPipelineActions: 0,
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},
904+
},
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},
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},
712907
} {
713908
t.Run(test.name, func(t *testing.T) {
714909
t.Logf("Running test number: %v, test name: %v,", i, test.name)

‎pkg/scheduler/cache/cache.go‎

Lines changed: 8 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -83,9 +83,13 @@ var terminalPodPhases = []v1.PodPhase{
8383
v1.PodFailed,
8484
}
8585

86-
func filterTerminalPods(options *metav1.ListOptions) {
87-
selectors := make([]string, 0, len(terminalPodPhases))
88-
for _, phase := range terminalPodPhases {
86+
var watchFilteredPodPhases = []v1.PodPhase{
87+
v1.PodFailed,
88+
}
89+
90+
func filterFailedPods(options *metav1.ListOptions) {
91+
selectors := make([]string, 0, len(watchFilteredPodPhases))
92+
for _, phase := range watchFilteredPodPhases {
8993
selectors = append(selectors, fmt.Sprintf("status.phase!=%s", phase))
9094
}
9195
selector := strings.Join(selectors, ",")
@@ -103,7 +107,7 @@ func registerSchedulerPodInformer(informerFactory informers.SharedInformerFactor
103107
metav1.NamespaceAll,
104108
resyncPeriod,
105109
k8scache.Indexers{k8scache.NamespaceIndex: k8scache.MetaNamespaceIndexFunc},
106-
filterTerminalPods,
110+
filterFailedPods,
107111
)
108112
})
109113
}

‎pkg/scheduler/cache/cache_test.go‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -58,7 +58,7 @@ func TestCache(t *testing.T) {
5858
var _ = Describe("Cache", func() {
5959
Describe("New", func() {
6060
Context("Pod informer filtering", func() {
61-
It("should filter terminal pods without filtering pods by scheduler name", func() {
61+
It("should filter failed pods while keeping succeeded pods, without filtering by scheduler name", func() {
6262
kubeClient := fake.NewSimpleClientset()
6363
cache := New(&SchedulerCacheParams{
6464
KubeClient: kubeClient,
@@ -95,8 +95,8 @@ var _ = Describe("Cache", func() {
9595

9696
Expect(podSelectors).NotTo(BeEmpty())
9797
for _, selector := range podSelectors {
98-
Expect(selector).To(ContainSubstring("status.phase!=Succeeded"))
9998
Expect(selector).To(ContainSubstring("status.phase!=Failed"))
99+
Expect(selector).NotTo(ContainSubstring("status.phase!=Succeeded"))
100100
Expect(selector).NotTo(ContainSubstring("spec.schedulerName"))
101101
}
102102
Expect(nonPodSelectors).To(BeEmpty())

‎pkg/scheduler/cache/pod_transform.go‎

Lines changed: 29 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5,7 +5,10 @@ package cache
55

66
import (
77
v1 "k8s.io/api/core/v1"
8+
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
89
"k8s.io/client-go/tools/cache"
10+
11+
commonconstants "github.com/kai-scheduler/KAI-scheduler/pkg/common/constants"
912
)
1013

1114
func setSchedulerPodTransform(informer cache.SharedIndexInformer) error {
@@ -18,6 +21,10 @@ func compactSchedulerPod(obj any) (any, error) {
1821
return obj, nil
1922
}
2023

24+
if pod.Status.Phase == v1.PodSucceeded {
25+
return compactSucceededPod(pod), nil
26+
}
27+
2128
compact := pod.DeepCopy()
2229
compact.ManagedFields = nil
2330
compact.Spec.Containers = compactContainers(compact.Spec.Containers)
@@ -26,6 +33,28 @@ func compactSchedulerPod(obj any) (any, error) {
2633
return compact, nil
2734
}
2835

36+
func compactSucceededPod(pod *v1.Pod) *v1.Pod {
37+
compact := &v1.Pod{
38+
ObjectMeta: metav1.ObjectMeta{
39+
Name: pod.Name,
40+
Namespace: pod.Namespace,
41+
UID: pod.UID,
42+
},
43+
Status: v1.PodStatus{
44+
Phase: pod.Status.Phase,
45+
},
46+
}
47+
48+
if podGroup, found := pod.Annotations[commonconstants.PodGroupAnnotationForPod]; found {
49+
compact.Annotations = map[string]string{commonconstants.PodGroupAnnotationForPod: podGroup}
50+
}
51+
if subGroup, found := pod.Labels[commonconstants.SubGroupLabelKey]; found {
52+
compact.Labels = map[string]string{commonconstants.SubGroupLabelKey: subGroup}
53+
}
54+
55+
return compact
56+
}
57+
2958
func compactContainers(containers []v1.Container) []v1.Container {
3059
compact := make([]v1.Container, 0, len(containers))
3160
for _, container := range containers {

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