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master.go
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master.go
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package server
import (
"context"
"fmt"
"path"
"time"
log "github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kube_watch "k8s.io/apimachinery/pkg/watch"
kube "k8s.io/client-go/kubernetes"
"github.com/pachyderm/pachyderm/src/client"
"github.com/pachyderm/pachyderm/src/client/pkg/uuid"
"github.com/pachyderm/pachyderm/src/client/pps"
"github.com/pachyderm/pachyderm/src/server/pkg/backoff"
col "github.com/pachyderm/pachyderm/src/server/pkg/collection"
"github.com/pachyderm/pachyderm/src/server/pkg/deploy/assets"
"github.com/pachyderm/pachyderm/src/server/pkg/dlock"
"github.com/pachyderm/pachyderm/src/server/pkg/util"
"github.com/pachyderm/pachyderm/src/server/pkg/watch"
ppsserver "github.com/pachyderm/pachyderm/src/server/pps"
)
const (
masterLockPath = "_master_lock"
)
var (
failures = map[string]bool{
"InvalidImageName": true,
"ErrImagePull": true,
}
)
// The master process is responsible for creating/deleting workers as
// pipelines are created/removed.
func (a *apiServer) master() {
masterLock := dlock.NewDLock(a.etcdClient, path.Join(a.etcdPrefix, masterLockPath))
backoff.RetryNotify(func() error {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
ctx, err := masterLock.Lock(ctx)
if err != nil {
return err
}
defer masterLock.Unlock(ctx)
log.Infof("Launching PPS master process")
pipelineWatcher, err := a.pipelines.ReadOnly(ctx).WatchWithPrev()
if err != nil {
return fmt.Errorf("error creating watch: %+v", err)
}
defer pipelineWatcher.Close()
// watchChan will be nil if the Watch call below errors, this means
// that we won't receive events from k8s and won't be able to detect
// errors in pods. We could just return that error and retry but that
// prevents pachyderm from creating pipelines when there's an issue
// talking to k8s.
var watchChan <-chan kube_watch.Event
kubePipelineWatch, err := a.kubeClient.CoreV1().Pods(a.namespace).Watch(
metav1.ListOptions{
LabelSelector: metav1.FormatLabelSelector(metav1.SetAsLabelSelector(
map[string]string{
"component": "worker",
})),
Watch: true,
})
if err != nil {
log.Errorf("failed to watch kuburnetes pods: %v", err)
} else {
watchChan = kubePipelineWatch.ResultChan()
defer kubePipelineWatch.Stop()
}
for {
select {
case event := <-pipelineWatcher.Watch():
if event.Err != nil {
return fmt.Errorf("event err: %+v", event.Err)
}
switch event.Type {
case watch.EventPut:
var pipelineName string
var pipelineInfo pps.PipelineInfo
if err := event.Unmarshal(&pipelineName, &pipelineInfo); err != nil {
return err
}
// This is a bit of a hack that covers for migrations bugs
// where a field is set by setPipelineDefaults in a newer
// version of the server but a PipelineInfo which was
// created with an older version of the server doesn't have
// that field set because setPipelineDefaults was different
// when it was created.
if pipelineInfo.Salt == "" || pipelineInfo.CacheSize == "" {
if _, err := col.NewSTM(ctx, a.etcdClient, func(stm col.STM) error {
pipelines := a.pipelines.ReadWrite(stm)
newPipelineInfo := new(pps.PipelineInfo)
if err := pipelines.Get(pipelineInfo.Pipeline.Name, newPipelineInfo); err != nil {
return fmt.Errorf("error getting pipeline %s: %+v", pipelineName, err)
}
if newPipelineInfo.Salt == "" {
newPipelineInfo.Salt = uuid.NewWithoutDashes()
}
setPipelineDefaults(newPipelineInfo)
pipelines.Put(pipelineInfo.Pipeline.Name, newPipelineInfo)
pipelineInfo = *newPipelineInfo
return nil
}); err != nil {
return err
}
}
var prevPipelineInfo pps.PipelineInfo
if event.PrevKey != nil {
if err := event.UnmarshalPrev(&pipelineName, &prevPipelineInfo); err != nil {
return err
}
}
// If the pipeline has been stopped, delete workers
if pipelineStateToStopped(pipelineInfo.State) {
log.Infof("master: deleting workers for pipeline %s", pipelineInfo.Pipeline.Name)
if err := a.deleteWorkersForPipeline(&pipelineInfo); err != nil {
return err
}
}
var hasGitInput bool
pps.VisitInput(pipelineInfo.Input, func(input *pps.Input) {
if input.Git != nil {
hasGitInput = true
}
})
// If the pipeline has been restarted, create workers
if !pipelineStateToStopped(pipelineInfo.State) && event.PrevKey != nil && pipelineStateToStopped(prevPipelineInfo.State) {
if hasGitInput {
if err := a.checkOrDeployGithookService(); err != nil {
return err
}
}
if err := a.upsertWorkersForPipeline(&pipelineInfo); err != nil {
if err := a.setPipelineFailure(ctx, pipelineInfo.Pipeline.Name, fmt.Sprintf("failed to create workers: %s", err.Error())); err != nil {
return err
}
continue
}
}
// If the pipeline has been updated, create new workers
if pipelineInfo.Version > prevPipelineInfo.Version && !pipelineStateToStopped(pipelineInfo.State) {
log.Infof("master: creating/updating workers for pipeline %s", pipelineInfo.Pipeline.Name)
if event.PrevKey != nil {
if err := a.deleteWorkersForPipeline(&prevPipelineInfo); err != nil {
return err
}
}
if hasGitInput {
if err := a.checkOrDeployGithookService(); err != nil {
return err
}
}
if err := a.upsertWorkersForPipeline(&pipelineInfo); err != nil {
if err := a.setPipelineFailure(ctx, pipelineInfo.Pipeline.Name, fmt.Sprintf("failed to create workers: %s", err.Error())); err != nil {
return err
}
continue
}
}
case watch.EventDelete:
var pipelineName string
var pipelineInfo pps.PipelineInfo
if err := event.UnmarshalPrev(&pipelineName, &pipelineInfo); err != nil {
return err
}
if err := a.deleteWorkersForPipeline(&pipelineInfo); err != nil {
return err
}
}
case event := <-watchChan:
// if we get an error we restart the watch, k8s watches seem to
// sometimes get stuck in a loop returning events with Type =
// "" we treat these as errors since otherwise we get an
// endless stream of them and can't do anything.
if event.Type == kube_watch.Error || event.Type == "" {
if kubePipelineWatch != nil {
kubePipelineWatch.Stop()
}
kubePipelineWatch, err = a.kubeClient.CoreV1().Pods(a.namespace).Watch(
metav1.ListOptions{
LabelSelector: metav1.FormatLabelSelector(metav1.SetAsLabelSelector(
map[string]string{
"component": "worker",
})),
Watch: true,
})
if err != nil {
log.Errorf("failed to watch kuburnetes pods: %v", err)
watchChan = nil
} else {
watchChan = kubePipelineWatch.ResultChan()
defer kubePipelineWatch.Stop()
}
}
pod, ok := event.Object.(*v1.Pod)
if !ok {
continue
}
if pod.Status.Phase == v1.PodFailed {
log.Errorf("pod failed because: %s", pod.Status.Message)
}
for _, status := range pod.Status.ContainerStatuses {
if status.Name == "user" && status.State.Waiting != nil && failures[status.State.Waiting.Reason] {
if err := a.setPipelineFailure(ctx, pod.ObjectMeta.Annotations["pipelineName"], status.State.Waiting.Message); err != nil {
return err
}
}
}
}
}
}, backoff.NewInfiniteBackOff(), func(err error, d time.Duration) error {
log.Errorf("master: error running the master process: %v; retrying in %v", err, d)
return nil
})
}
func (a *apiServer) setPipelineFailure(ctx context.Context, pipelineName string, reason string) error {
return util.FailPipeline(ctx, a.etcdClient, a.pipelines, pipelineName, reason)
}
func (a *apiServer) checkOrDeployGithookService() error {
_, err := getGithookService(a.kubeClient, a.namespace)
if err != nil {
if _, ok := err.(*errGithookServiceNotFound); ok {
svc := assets.GithookService()
_, err = a.kubeClient.CoreV1().Services(a.namespace).Create(svc)
return err
}
return err
}
// service already exists
return nil
}
func getGithookService(kubeClient *kube.Clientset, namespace string) (*v1.Service, error) {
labels := map[string]string{
"app": "githook",
"suite": suite,
}
serviceList, err := kubeClient.CoreV1().Services(namespace).List(metav1.ListOptions{
TypeMeta: metav1.TypeMeta{
Kind: "ListOptions",
APIVersion: "v1",
},
LabelSelector: metav1.FormatLabelSelector(metav1.SetAsLabelSelector(labels)),
})
if err != nil {
return nil, err
}
if len(serviceList.Items) != 1 {
return nil, &errGithookServiceNotFound{
fmt.Errorf("expected 1 githook service but found %v", len(serviceList.Items)),
}
}
return &serviceList.Items[0], nil
}
func (a *apiServer) upsertWorkersForPipeline(pipelineInfo *pps.PipelineInfo) error {
var errCount int
return backoff.RetryNotify(func() error {
parallelism, err := ppsserver.GetExpectedNumWorkers(a.kubeClient, pipelineInfo.ParallelismSpec)
if err != nil {
log.Errorf("error getting number of workers, default to 1 worker: %v", err)
parallelism = 1
}
var resourceRequests *v1.ResourceList
var resourceLimits *v1.ResourceList
if pipelineInfo.ResourceRequests != nil {
resourceRequests, err = util.GetRequestsResourceListFromPipeline(pipelineInfo)
if err != nil {
return err
}
}
if pipelineInfo.ResourceLimits != nil {
resourceLimits, err = util.GetLimitsResourceListFromPipeline(pipelineInfo)
if err != nil {
return err
}
}
// Retrieve the current state of the RC. If the RC is scaled down,
// we want to ensure that it remains scaled down.
rc := a.kubeClient.CoreV1().ReplicationControllers(a.namespace)
workerRc, err := rc.Get(
ppsserver.PipelineRcName(pipelineInfo.Pipeline.Name, pipelineInfo.Version),
metav1.GetOptions{})
if err == nil {
if (workerRc.Spec.Template.Spec.Containers[0].Resources.Requests == nil) && *workerRc.Spec.Replicas == 1 {
parallelism = 1
resourceRequests = nil
resourceLimits = nil
}
}
options := a.getWorkerOptions(
pipelineInfo.Pipeline.Name,
ppsserver.PipelineRcName(pipelineInfo.Pipeline.Name, pipelineInfo.Version),
int32(parallelism),
resourceRequests,
resourceLimits,
pipelineInfo.Transform,
pipelineInfo.CacheSize,
pipelineInfo.Service)
// Set the pipeline name env
options.workerEnv = append(options.workerEnv, v1.EnvVar{
Name: client.PPSPipelineNameEnv,
Value: pipelineInfo.Pipeline.Name,
})
return a.createWorkerRc(options)
}, backoff.NewInfiniteBackOff(), func(err error, d time.Duration) error {
errCount++
if errCount >= 3 {
return err
}
log.Errorf("error creating workers for pipeline %v: %v; retrying in %v", pipelineInfo.Pipeline.Name, err, d)
return nil
})
}
func (a *apiServer) deleteWorkersForPipeline(pipelineInfo *pps.PipelineInfo) error {
rcName := ppsserver.PipelineRcName(pipelineInfo.Pipeline.Name, pipelineInfo.Version)
if err := a.kubeClient.CoreV1().Services(a.namespace).Delete(
rcName, &metav1.DeleteOptions{},
); err != nil {
if !isNotFoundErr(err) {
return err
}
}
if pipelineInfo.Service != nil {
if err := a.kubeClient.CoreV1().Services(a.namespace).Delete(
rcName+"-user", &metav1.DeleteOptions{},
); err != nil {
if !isNotFoundErr(err) {
return err
}
}
}
falseVal := false
deleteOptions := &metav1.DeleteOptions{
OrphanDependents: &falseVal,
}
if err := a.kubeClient.CoreV1().ReplicationControllers(a.namespace).Delete(rcName, deleteOptions); err != nil {
if !isNotFoundErr(err) {
return err
}
}
return nil
}