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Merge pull request #26900 from Clarifai/aws-instance-cache

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Automatic merge from submit-queue

AWS: cache instances during service reload to avoid rate limiting on restart

Fixes #25610 by reducing redundant calls to DescribeInstances()
 
```release-note
* The AWS cloudprovider will cache results from DescribeInstances() if the set of nodes hasn't changed
```

Also move int/stringSlicesEqual from servicecontroller.go to pkg/util/slice
This commit is contained in:
k8s-merge-robot 2016-06-12 14:24:25 -07:00 committed by GitHub
commit 6d32eba4fd
2 changed files with 30 additions and 13 deletions
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37
pkg/cloudprovider/providers/aws/aws.go
View File

@ -39,16 +39,15 @@ import (
"github.com/aws/aws-sdk-go/service/autoscaling"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/elb"
"github.com/golang/glog"
"gopkg.in/gcfg.v1"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/service"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/cloudprovider"
aws_credentials "k8s.io/kubernetes/pkg/credentialprovider/aws"
"k8s.io/kubernetes/pkg/types"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api/service"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/util/sets"
)
@ -262,7 +261,9 @@ type AWSCloud struct {
// Note that we cache some state in awsInstance (mountpoints), so we must preserve the instance
selfAWSInstance *awsInstance
mutex sync.Mutex
mutex sync.Mutex
lastNodeNames sets.String
lastInstancesByNodeNames []*ec2.Instance
}
var _ Volumes = &AWSCloud{}
@ -2237,7 +2238,8 @@ func (s *AWSCloud) EnsureLoadBalancer(apiService *api.Service, hosts []string) (
return nil, fmt.Errorf("LoadBalancerIP cannot be specified for AWS ELB")
}
instances, err := s.getInstancesByNodeNames(hosts)
hostSet := sets.NewString(hosts...)
instances, err := s.getInstancesByNodeNamesCached(hostSet)
if err != nil {
return nil, err
}
@ -2675,7 +2677,8 @@ func (s *AWSCloud) EnsureLoadBalancerDeleted(service *api.Service) error {
// UpdateLoadBalancer implements LoadBalancer.UpdateLoadBalancer
func (s *AWSCloud) UpdateLoadBalancer(service *api.Service, hosts []string) error {
instances, err := s.getInstancesByNodeNames(hosts)
hostSet := sets.NewString(hosts...)
instances, err := s.getInstancesByNodeNamesCached(hostSet)
if err != nil {
return err
}
@ -2747,10 +2750,21 @@ func (a *AWSCloud) getInstancesByIDs(instanceIDs []*string) (map[string]*ec2.Ins
return instancesByID, nil
}
// Fetches instances by node names; returns an error if any cannot be found.
// Fetches and caches instances by node names; returns an error if any cannot be found.
// This is implemented with a multi value filter on the node names, fetching the desired instances with a single query.
func (a *AWSCloud) getInstancesByNodeNames(nodeNames []string) ([]*ec2.Instance, error) {
names := aws.StringSlice(nodeNames)
// TODO(therc): make all the caching more rational during the 1.4 timeframe
func (a *AWSCloud) getInstancesByNodeNamesCached(nodeNames sets.String) ([]*ec2.Instance, error) {
a.mutex.Lock()
defer a.mutex.Unlock()
if nodeNames.Equal(a.lastNodeNames) {
if len(a.lastInstancesByNodeNames) > 0 {
// We assume that if the list of nodes is the same, the underlying
// instances have not changed. Later we might guard this with TTLs.
glog.V(2).Infof("Returning cached instances for %v", nodeNames)
return a.lastInstancesByNodeNames, nil
}
}
names := aws.StringSlice(nodeNames.List())
nodeNameFilter := &ec2.Filter{
Name: aws.String("private-dns-name"),
@ -2778,6 +2792,9 @@ func (a *AWSCloud) getInstancesByNodeNames(nodeNames []string) ([]*ec2.Instance,
return nil, nil
}
glog.V(2).Infof("Caching instances for %v", nodeNames)
a.lastNodeNames = nodeNames
a.lastInstancesByNodeNames = instances
return instances, nil
}

6
pkg/cloudprovider/providers/aws/aws_test.go
View File

@ -1093,7 +1093,7 @@ func TestFindInstanceByNodeNameExcludesTerminatedInstances(t *testing.T) {
}
}
func TestFindInstancesByNodeName(t *testing.T) {
func TestFindInstancesByNodeNameCached(t *testing.T) {
awsServices := NewFakeAWSServices()
nodeNameOne := "my-dns.internal"
@ -1132,8 +1132,8 @@ func TestFindInstancesByNodeName(t *testing.T) {
return
}
nodeNames := []string{nodeNameOne}
returnedInstances, errr := c.getInstancesByNodeNames(nodeNames)
nodeNames := sets.NewString(nodeNameOne)
returnedInstances, errr := c.getInstancesByNodeNamesCached(nodeNames)
if errr != nil {
t.Errorf("Failed to find instance: %v", err)