feat: skip checkpoint cleanup for nodes with running jobs

pkg/metricstore/archive.go

@@ -94,16 +94,32 @@ var ErrNoNewArchiveData error = errors.New("all data already archived")
 
 // CleanupCheckpoints deletes or archives all checkpoint files older than `from`.
 // When archiving, consolidates all hosts per cluster into a single Parquet file.
+//
+// Hosts currently in use by running jobs (per the MemoryStore's NodeProvider)
+// are skipped entirely; their files are handled by a later cycle once the job
+// has ended. If the provider query fails, the whole cycle is aborted: deleting
+// without knowing which nodes are in use risks data loss. Without a provider,
+// everything older than `from` is cleaned (old behavior).
 func CleanupCheckpoints(checkpointsDir, cleanupDir string, from int64, deleteInstead bool) (int, error) {
-	if deleteInstead {
-		return deleteCheckpoints(checkpointsDir, from)
+	var usedNodes map[string][]string
+	if ms := GetMemoryStore(); ms != nil && ms.nodeProvider != nil {
+		un, err := ms.nodeProvider.GetUsedNodes(from)
+		if err != nil {
+			return 0, fmt.Errorf("aborting cleanup, could not determine nodes in use: %w", err)
+		}
+		usedNodes = un
 	}
 
-	return archiveCheckpoints(checkpointsDir, cleanupDir, from)
+	if deleteInstead {
+		return deleteCheckpoints(checkpointsDir, from, usedNodes)
+	}
+
+	return archiveCheckpoints(checkpointsDir, cleanupDir, from, usedNodes)
 }
 
 // deleteCheckpoints removes checkpoint files older than `from` across all clusters/hosts.
-func deleteCheckpoints(checkpointsDir string, from int64) (int, error) {
+// Hosts present in usedNodes are skipped.
+func deleteCheckpoints(checkpointsDir string, from int64, usedNodes map[string][]string) (int, error) {
 	entries1, err := os.ReadDir(checkpointsDir)
 	if err != nil {
 		return 0, err
@@ -157,6 +173,10 @@ func deleteCheckpoints(checkpointsDir string, from int64) (int, error) {
 		}
 
 		for _, de2 := range entries2 {
+			if isNodeUsed(usedNodes, de1.Name(), de2.Name()) {
+				cclog.Debugf("[METRICSTORE]> skipping delete for %s/%s: node in use by running job", de1.Name(), de2.Name())
+				continue
+			}
 			work <- workItem{
 				dir:     filepath.Join(checkpointsDir, de1.Name(), de2.Name()),
 				cluster: de1.Name(),
@@ -182,7 +202,7 @@ func deleteCheckpoints(checkpointsDir string, from int64) (int, error) {
 // Workers load checkpoint files from disk and send CheckpointFile trees on a
 // back-pressured channel. The main thread streams each tree directly to Parquet
 // rows without materializing all rows in memory.
-func archiveCheckpoints(checkpointsDir, cleanupDir string, from int64) (int, error) {
+func archiveCheckpoints(checkpointsDir, cleanupDir string, from int64, usedNodes map[string][]string) (int, error) {
 	cclog.Info("[METRICSTORE]> start archiving checkpoints to parquet")
 	startTime := time.Now()
 
@@ -252,6 +272,10 @@ func archiveCheckpoints(checkpointsDir, cleanupDir string, from int64) (int, err
 				if !hostEntry.IsDir() {
 					continue
 				}
+				if isNodeUsed(usedNodes, cluster, hostEntry.Name()) {
+					cclog.Debugf("[METRICSTORE]> skipping archive for %s/%s: node in use by running job", cluster, hostEntry.Name())
+					continue
+				}
 				dir := filepath.Join(checkpointsDir, cluster, hostEntry.Name())
 				work <- struct {
 					dir, host string

pkg/metricstore/nodeprovider_test.go

@@ -161,3 +161,104 @@ func TestFromCheckpointProviderErrorFallsBack(t *testing.T) {
 		t.Fatalf("expected fallback to cutoff load (4 files), got %d", n)
 	}
 }
+
+func TestDeleteCheckpointsSkipsUsedNodes(t *testing.T) {
+	oldWorkers := Keys.NumWorkers
+	Keys.NumWorkers = 2
+	t.Cleanup(func() { Keys.NumWorkers = oldWorkers })
+
+	dir := t.TempDir()
+	writeTestCheckpoint(t, filepath.Join(dir, "fritz", "node001"), 1000)
+	writeTestCheckpoint(t, filepath.Join(dir, "fritz", "node002"), 1000)
+
+	used := map[string][]string{"fritz": {"node001"}}
+	n, err := deleteCheckpoints(dir, 3000, used)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if n != 1 {
+		t.Fatalf("expected 1 file deleted, got %d", n)
+	}
+	if _, err := os.Stat(filepath.Join(dir, "fritz", "node001", "1000.json")); err != nil {
+		t.Errorf("used node's checkpoint must survive: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(dir, "fritz", "node002", "1000.json")); !os.IsNotExist(err) {
+		t.Error("unused node's checkpoint must be deleted")
+	}
+}
+
+func TestArchiveCheckpointsSkipsUsedNodes(t *testing.T) {
+	oldWorkers := Keys.NumWorkers
+	Keys.NumWorkers = 2
+	t.Cleanup(func() { Keys.NumWorkers = oldWorkers })
+
+	cpDir := t.TempDir()
+	archiveDir := t.TempDir()
+	writeTestCheckpoint(t, filepath.Join(cpDir, "fritz", "node001"), 1000)
+	writeTestCheckpoint(t, filepath.Join(cpDir, "fritz", "node002"), 1000)
+
+	used := map[string][]string{"fritz": {"node001"}}
+	n, err := archiveCheckpoints(cpDir, archiveDir, 3000, used)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if n != 1 {
+		t.Fatalf("expected 1 file archived, got %d", n)
+	}
+	if _, err := os.Stat(filepath.Join(cpDir, "fritz", "node001", "1000.json")); err != nil {
+		t.Errorf("used node's checkpoint must survive: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(cpDir, "fritz", "node002", "1000.json")); !os.IsNotExist(err) {
+		t.Error("unused node's checkpoint must be removed after archiving")
+	}
+	if _, err := os.Stat(filepath.Join(archiveDir, "fritz", "3000.parquet")); err != nil {
+		t.Errorf("parquet archive must exist: %v", err)
+	}
+}
+
+func TestCleanupCheckpointsAbortsOnProviderError(t *testing.T) {
+	oldWorkers := Keys.NumWorkers
+	Keys.NumWorkers = 2
+	t.Cleanup(func() { Keys.NumWorkers = oldWorkers })
+
+	oldMS := msInstance
+	msInstance = newTestStore()
+	msInstance.SetNodeProvider(&fakeNodeProvider{err: errTestProvider})
+	t.Cleanup(func() { msInstance = oldMS })
+
+	dir := t.TempDir()
+	writeTestCheckpoint(t, filepath.Join(dir, "fritz", "node001"), 1000)
+
+	if _, err := CleanupCheckpoints(dir, "", 3000, true); err == nil {
+		t.Fatal("expected error when GetUsedNodes fails")
+	}
+	if _, err := os.Stat(filepath.Join(dir, "fritz", "node001", "1000.json")); err != nil {
+		t.Errorf("no files may be deleted when provider errors: %v", err)
+	}
+}
+
+func TestCleanupCheckpointsUsedNodesSurvive(t *testing.T) {
+	oldWorkers := Keys.NumWorkers
+	Keys.NumWorkers = 2
+	t.Cleanup(func() { Keys.NumWorkers = oldWorkers })
+
+	oldMS := msInstance
+	msInstance = newTestStore()
+	msInstance.SetNodeProvider(&fakeNodeProvider{nodes: map[string][]string{"fritz": {"node001"}}})
+	t.Cleanup(func() { msInstance = oldMS })
+
+	dir := t.TempDir()
+	writeTestCheckpoint(t, filepath.Join(dir, "fritz", "node001"), 1000)
+	writeTestCheckpoint(t, filepath.Join(dir, "fritz", "node002"), 1000)
+
+	n, err := CleanupCheckpoints(dir, "", 3000, true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if n != 1 {
+		t.Fatalf("expected 1 file deleted, got %d", n)
+	}
+	if _, err := os.Stat(filepath.Join(dir, "fritz", "node001", "1000.json")); err != nil {
+		t.Errorf("used node's checkpoint must survive: %v", err)
+	}
+}