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Page list requests by default (#3823)

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Signed-off-by: Dharma Bellamkonda <bellamko@adobe.com>
This commit is contained in:
Dharma Bellamkonda
2021-08-17 18:49:41 -07:00
committed by GitHub
parent 31a8e5080c
commit dc1f17944e
5 changed files with 88 additions and 13 deletions
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changelogs/unreleased/3823-dharmab
+1
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@@ -0,0 +1 @@
Add --client-page-size flag to server to allow chunking Kubernetes API LIST calls across multiple requests on large clusters
pkg/backup/backup.go
+5 -1
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@@ -1,5 +1,5 @@
/*
Copyright 2020 the Velero contributors.
Copyright the Velero contributors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
@@ -73,6 +73,7 @@ type kubernetesBackupper struct {
resticBackupperFactory restic.BackupperFactory
resticTimeout time.Duration
defaultVolumesToRestic bool
clientPageSize int
}
type resolvedAction struct {
@@ -106,6 +107,7 @@ func NewKubernetesBackupper(
resticBackupperFactory restic.BackupperFactory,
resticTimeout time.Duration,
defaultVolumesToRestic bool,
clientPageSize int,
) (Backupper, error) {
return &kubernetesBackupper{
backupClient: backupClient,
@@ -115,6 +117,7 @@ func NewKubernetesBackupper(
resticBackupperFactory: resticBackupperFactory,
resticTimeout: resticTimeout,
defaultVolumesToRestic: defaultVolumesToRestic,
clientPageSize: clientPageSize,
}, nil
}
@@ -272,6 +275,7 @@ func (kb *kubernetesBackupper) Backup(log logrus.FieldLogger, backupRequest *Req
dynamicFactory: kb.dynamicFactory,
cohabitatingResources: cohabitatingResources(),
dir: tempDir,
pageSize: kb.clientPageSize,
}
items := collector.getAllItems()
pkg/backup/item_collector.go
+63 -10
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@@ -1,5 +1,5 @@
/*
Copyright 2020 the Velero contributors.
Copyright the Velero contributors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@ limitations under the License.
package backup
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
@@ -25,10 +26,13 @@ import (
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/tools/pager"
"github.com/vmware-tanzu/velero/pkg/client"
"github.com/vmware-tanzu/velero/pkg/discovery"
@@ -45,6 +49,7 @@ type itemCollector struct {
dynamicFactory client.DynamicFactory
cohabitatingResources map[string]*cohabitatingResource
dir string
pageSize int
}
type kubernetesResource struct {
@@ -275,6 +280,7 @@ func (r *itemCollector) getResourceItems(log logrus.FieldLogger, gv schema.Group
var items []*kubernetesResource
for _, namespace := range namespacesToList {
// List items from Kubernetes API
log = log.WithField("namespace", namespace)
resourceClient, err := r.dynamicFactory.ClientForGroupVersionResource(gv, resource, namespace)
@@ -287,18 +293,65 @@ func (r *itemCollector) getResourceItems(log logrus.FieldLogger, gv schema.Group
if selector := r.backupRequest.Spec.LabelSelector; selector != nil {
labelSelector = metav1.FormatLabelSelector(selector)
}
listOptions := metav1.ListOptions{LabelSelector: labelSelector}
log.Info("Listing items")
unstructuredList, err := resourceClient.List(metav1.ListOptions{LabelSelector: labelSelector})
if err != nil {
log.WithError(errors.WithStack(err)).Error("Error listing items")
continue
}
log.Infof("Retrieved %d items", len(unstructuredList.Items))
unstructuredItems := make([]unstructured.Unstructured, 0)
// collect the items
for i := range unstructuredList.Items {
item := &unstructuredList.Items[i]
if r.pageSize > 0 {
// If limit is positive, use a pager to split list over multiple requests
// Use Velero's dynamic list function instead of the default
listFunc := pager.SimplePageFunc(func(opts metav1.ListOptions) (runtime.Object, error) {
list, err := resourceClient.List(listOptions)
if err != nil {
return nil, err
}
return list, nil
})
listPager := pager.New(listFunc)
// Use the page size defined in the server config
// TODO allow configuration of page buffer size
listPager.PageSize = int64(r.pageSize)
// Add each item to temporary slice
var items []unstructured.Unstructured
err := listPager.EachListItem(context.Background(), listOptions, func(object runtime.Object) error {
item, isUnstructured := object.(*unstructured.Unstructured)
if !isUnstructured {
// We should never hit this
log.Error("Got type other than Unstructured from pager func")
return nil
}
items = append(items, *item)
return nil
})
if statusError, isStatusError := err.(*apierrors.StatusError); isStatusError && statusError.Status().Reason == metav1.StatusReasonExpired {
log.WithError(errors.WithStack(err)).Error("Error paging item list. Falling back on unpaginated list")
unstructuredList, err := resourceClient.List(listOptions)
if err != nil {
log.WithError(errors.WithStack(err)).Error("Error listing items")
continue
}
items = unstructuredList.Items
} else if err != nil {
log.WithError(errors.WithStack(err)).Error("Error paging item list")
continue
}
unstructuredItems = append(unstructuredItems, items...)
} else {
// If limit is not positive, do not use paging. Instead, request all items at once
unstructuredList, err := resourceClient.List(metav1.ListOptions{LabelSelector: labelSelector})
unstructuredItems = append(unstructuredItems, unstructuredList.Items...)
if err != nil {
log.WithError(errors.WithStack(err)).Error("Error listing items")
continue
}
}
log.Infof("Retrieved %d items", len(unstructuredItems))
// Collect items in included Namespaces
for i := range unstructuredItems {
item := &unstructuredItems[i]
if gr == kuberesource.Namespaces && !r.backupRequest.NamespaceIncludesExcludes.ShouldInclude(item.GetName()) {
log.WithField("name", item.GetName()).Info("Skipping namespace because it's excluded")
pkg/cmd/server/server.go
+11 -2
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@@ -90,8 +90,9 @@ const (
defaultResourceTerminatingTimeout = 10 * time.Minute
// server's client default qps and burst
defaultClientQPS float32 = 20.0
defaultClientBurst int = 30
defaultClientQPS float32 = 20.0
defaultClientBurst int = 30
defaultClientPageSize int = 500
defaultProfilerAddress = "localhost:6060"
@@ -115,6 +116,7 @@ type serverConfig struct {
disabledControllers []string
clientQPS float32
clientBurst int
clientPageSize int
profilerAddress string
formatFlag *logging.FormatFlag
defaultResticMaintenanceFrequency time.Duration
@@ -142,6 +144,7 @@ func NewCommand(f client.Factory) *cobra.Command {
restoreResourcePriorities: defaultRestorePriorities,
clientQPS: defaultClientQPS,
clientBurst: defaultClientBurst,
clientPageSize: defaultClientPageSize,
profilerAddress: defaultProfilerAddress,
resourceTerminatingTimeout: defaultResourceTerminatingTimeout,
formatFlag: logging.NewFormatFlag(),
@@ -205,6 +208,7 @@ func NewCommand(f client.Factory) *cobra.Command {
command.Flags().Var(&volumeSnapshotLocations, "default-volume-snapshot-locations", "List of unique volume providers and default volume snapshot location (provider1:location-01,provider2:location-02,...)")
command.Flags().Float32Var(&config.clientQPS, "client-qps", config.clientQPS, "Maximum number of requests per second by the server to the Kubernetes API once the burst limit has been reached.")
command.Flags().IntVar(&config.clientBurst, "client-burst", config.clientBurst, "Maximum number of requests by the server to the Kubernetes API in a short period of time.")
command.Flags().IntVar(&config.clientPageSize, "client-page-size", config.clientPageSize, "Page size of requests by the server to the Kubernetes API when listing objects during a backup. Set to 0 to disable paging.")
command.Flags().StringVar(&config.profilerAddress, "profiler-address", config.profilerAddress, "The address to expose the pprof profiler.")
command.Flags().DurationVar(&config.resourceTerminatingTimeout, "terminating-resource-timeout", config.resourceTerminatingTimeout, "How long to wait on persistent volumes and namespaces to terminate during a restore before timing out.")
command.Flags().DurationVar(&config.defaultBackupTTL, "default-backup-ttl", config.defaultBackupTTL, "How long to wait by default before backups can be garbage collected.")
@@ -249,6 +253,10 @@ func newServer(f client.Factory, config serverConfig, logger *logrus.Logger) (*s
}
f.SetClientBurst(config.clientBurst)
if config.clientPageSize < 0 {
return nil, errors.New("client-page-size must not be negative")
}
kubeClient, err := f.KubeClient()
if err != nil {
return nil, err
@@ -610,6 +618,7 @@ func (s *server) runControllers(defaultVolumeSnapshotLocations map[string]string
s.resticManager,
s.config.podVolumeOperationTimeout,
s.config.defaultVolumesToRestic,
s.config.clientPageSize,
)
cmd.CheckError(err)
site/content/docs/main/backup-reference.md
+8
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@@ -60,3 +60,11 @@ velero backup create --from-schedule example-schedule
```
This command will immediately trigger a new backup based on your template for `example-schedule`. This will not affect the backup schedule, and another backup will trigger at the scheduled time.
## Kubernetes API Pagination
By default, Velero will paginate the LIST API call for each resource type in the Kubernetes API when collecting items into a backup. The `--client-page-size` flag for the Velero server configures the size of each page.
Depending on the cluster's scale, tuning the page size can improve backup performance. You can experiment with higher values, noting their impact on the relevant `apiserver_request_duration_seconds_*` metrics from the Kubernetes apiserver.
Pagination can be entirely disabled by setting `--client-page-size` to `0`. This will request all items in a single unpaginated LIST call.