Merge pull request kubernetes#76749 from mcrute/ec2-rate-limit-fix

Avoid using tag filters for EC2 API where possible

Author: k8s-ci-robot

staging/src/k8s.io/legacy-cloud-providers/aws/aws.go

@@ -904,12 +904,28 @@ func (s *awsSdkEC2) DescribeInstances(request *ec2.DescribeInstancesInput) ([]*e
 
 // Implements EC2.DescribeSecurityGroups
 func (s *awsSdkEC2) DescribeSecurityGroups(request *ec2.DescribeSecurityGroupsInput) ([]*ec2.SecurityGroup, error) {
-	// Security groups are not paged
-	response, err := s.ec2.DescribeSecurityGroups(request)
-	if err != nil {
-		return nil, fmt.Errorf("error listing AWS security groups: %q", err)
+	// Security groups are paged
+	results := []*ec2.SecurityGroup{}
+	var nextToken *string
+	requestTime := time.Now()
+	for {
+		response, err := s.ec2.DescribeSecurityGroups(request)
+		if err != nil {
+			recordAWSMetric("describe_security_groups", 0, err)
+			return nil, fmt.Errorf("error listing AWS security groups: %q", err)
+		}
+
+		results = append(results, response.SecurityGroups...)
+
+		nextToken = response.NextToken
+		if aws.StringValue(nextToken) == "" {
+			break
+		}
+		request.NextToken = nextToken
 	}
-	return response.SecurityGroups, nil
+	timeTaken := time.Since(requestTime).Seconds()
+	recordAWSMetric("describe_security_groups", timeTaken, nil)
+	return results, nil
 }
 
 func (s *awsSdkEC2) AttachVolume(request *ec2.AttachVolumeInput) (*ec2.VolumeAttachment, error) {
@@ -1034,12 +1050,27 @@ func (s *awsSdkEC2) CreateTags(request *ec2.CreateTagsInput) (*ec2.CreateTagsOut
 }
 
 func (s *awsSdkEC2) DescribeRouteTables(request *ec2.DescribeRouteTablesInput) ([]*ec2.RouteTable, error) {
-	// Not paged
-	response, err := s.ec2.DescribeRouteTables(request)
-	if err != nil {
-		return nil, fmt.Errorf("error listing AWS route tables: %q", err)
+	results := []*ec2.RouteTable{}
+	var nextToken *string
+	requestTime := time.Now()
+	for {
+		response, err := s.ec2.DescribeRouteTables(request)
+		if err != nil {
+			recordAWSMetric("describe_route_tables", 0, err)
+			return nil, fmt.Errorf("error listing AWS route tables: %q", err)
+		}
+
+		results = append(results, response.RouteTables...)
+
+		nextToken = response.NextToken
+		if aws.StringValue(nextToken) == "" {
+			break
+		}
+		request.NextToken = nextToken
 	}
-	return response.RouteTables, nil
+	timeTaken := time.Since(requestTime).Seconds()
+	recordAWSMetric("describe_route_tables", timeTaken, nil)
+	return results, nil
 }
 
 func (s *awsSdkEC2) CreateRoute(request *ec2.CreateRouteInput) (*ec2.CreateRouteOutput, error) {
@@ -1573,13 +1604,32 @@ func (c *Cloud) GetCandidateZonesForDynamicVolume() (sets.String, error) {
 	// TODO: Caching / expose v1.Nodes to the cloud provider?
 	// TODO: We could also query for subnets, I think
 
-	filters := []*ec2.Filter{newEc2Filter("instance-state-name", "running")}
+	// Note: It is more efficient to call the EC2 API twice with different tag
+	// filters than to call it once with a tag filter that results in a logical
+	// OR. For really large clusters the logical OR will result in EC2 API rate
+	// limiting.
+	instances := []*ec2.Instance{}
 
-	instances, err := c.describeInstances(filters)
+	baseFilters := []*ec2.Filter{newEc2Filter("instance-state-name", "running")}
+
+	filters := c.tagging.addFilters(baseFilters)
+	di, err := c.describeInstances(filters)
 	if err != nil {
 		return nil, err
 	}
 
+	instances = append(instances, di...)
+
+	if c.tagging.usesLegacyTags {
+		filters = c.tagging.addLegacyFilters(baseFilters)
+		di, err = c.describeInstances(filters)
+		if err != nil {
+			return nil, err
+		}
+
+		instances = append(instances, di...)
+	}
+
 	if len(instances) == 0 {
 		return nil, fmt.Errorf("no instances returned")
 	}
@@ -3022,17 +3072,16 @@ func (c *Cloud) ensureSecurityGroup(name string, description string, additionalT
 	for {
 		attempt++
 
-		request := &ec2.DescribeSecurityGroupsInput{}
-		filters := []*ec2.Filter{
-			newEc2Filter("group-name", name),
-			newEc2Filter("vpc-id", c.vpcID),
-		}
 		// Note that we do _not_ add our tag filters; group-name + vpc-id is the EC2 primary key.
 		// However, we do check that it matches our tags.
 		// If it doesn't have any tags, we tag it; this is how we recover if we failed to tag before.
 		// If it has a different cluster's tags, that is an error.
 		// This shouldn't happen because name is expected to be globally unique (UUID derived)
-		request.Filters = filters
+		request := &ec2.DescribeSecurityGroupsInput{}
+		request.Filters = []*ec2.Filter{
+			newEc2Filter("group-name", name),
+			newEc2Filter("vpc-id", c.vpcID),
+		}
 
 		securityGroups, err := c.ec2.DescribeSecurityGroups(request)
 		if err != nil {
@@ -3108,8 +3157,7 @@ func findTag(tags []*ec2.Tag, key string) (string, bool) {
 // However, in future this will likely be treated as an error.
 func (c *Cloud) findSubnets() ([]*ec2.Subnet, error) {
 	request := &ec2.DescribeSubnetsInput{}
-	filters := []*ec2.Filter{newEc2Filter("vpc-id", c.vpcID)}
-	request.Filters = c.tagging.addFilters(filters)
+	request.Filters = []*ec2.Filter{newEc2Filter("vpc-id", c.vpcID)}
 
 	subnets, err := c.ec2.DescribeSubnets(request)
 	if err != nil {
@@ -3131,8 +3179,7 @@ func (c *Cloud) findSubnets() ([]*ec2.Subnet, error) {
 	klog.Warningf("No tagged subnets found; will fall-back to the current subnet only.  This is likely to be an error in a future version of k8s.")
 
 	request = &ec2.DescribeSubnetsInput{}
-	filters = []*ec2.Filter{newEc2Filter("subnet-id", c.selfAWSInstance.subnetID)}
-	request.Filters = filters
+	request.Filters = []*ec2.Filter{newEc2Filter("subnet-id", c.selfAWSInstance.subnetID)}
 
 	subnets, err = c.ec2.DescribeSubnets(request)
 	if err != nil {
@@ -3888,7 +3935,6 @@ func findSecurityGroupForInstance(instance *ec2.Instance, taggedSecurityGroups m
 // Return all the security groups that are tagged as being part of our cluster
 func (c *Cloud) getTaggedSecurityGroups() (map[string]*ec2.SecurityGroup, error) {
 	request := &ec2.DescribeSecurityGroupsInput{}
-	request.Filters = c.tagging.addFilters(nil)
 	groups, err := c.ec2.DescribeSecurityGroups(request)
 	if err != nil {
 		return nil, fmt.Errorf("error querying security groups: %q", err)
@@ -3937,10 +3983,9 @@ func (c *Cloud) updateInstanceSecurityGroupsForLoadBalancer(lb *elb.LoadBalancer
 	var actualGroups []*ec2.SecurityGroup
 	{
 		describeRequest := &ec2.DescribeSecurityGroupsInput{}
-		filters := []*ec2.Filter{
+		describeRequest.Filters = []*ec2.Filter{
 			newEc2Filter("ip-permission.group-id", loadBalancerSecurityGroupID),
 		}
-		describeRequest.Filters = c.tagging.addFilters(filters)
 		response, err := c.ec2.DescribeSecurityGroups(describeRequest)
 		if err != nil {
 			return fmt.Errorf("error querying security groups for ELB: %q", err)
@@ -4098,10 +4143,9 @@ func (c *Cloud) EnsureLoadBalancerDeleted(ctx context.Context, clusterName strin
 			{
 				// Server side filter
 				describeRequest := &ec2.DescribeSecurityGroupsInput{}
-				filters := []*ec2.Filter{
+				describeRequest.Filters = []*ec2.Filter{
 					newEc2Filter("ip-permission.protocol", "tcp"),
 				}
-				describeRequest.Filters = c.tagging.addFilters(filters)
 				response, err := c.ec2.DescribeSecurityGroups(describeRequest)
 				if err != nil {
 					return fmt.Errorf("Error querying security groups for NLB: %q", err)
@@ -4229,10 +4273,9 @@ func (c *Cloud) EnsureLoadBalancerDeleted(ctx context.Context, clusterName strin
 		var loadBalancerSGs = aws.StringValueSlice(lb.SecurityGroups)
 
 		describeRequest := &ec2.DescribeSecurityGroupsInput{}
-		filters := []*ec2.Filter{
+		describeRequest.Filters = []*ec2.Filter{
 			newEc2Filter("group-id", loadBalancerSGs...),
 		}
-		describeRequest.Filters = c.tagging.addFilters(filters)
 		response, err := c.ec2.DescribeSecurityGroups(describeRequest)
 		if err != nil {
 			return fmt.Errorf("error querying security groups for ELB: %q", err)
@@ -4444,7 +4487,6 @@ func (c *Cloud) getInstancesByNodeNames(nodeNames []string, states ...string) ([
 
 // TODO: Move to instanceCache
 func (c *Cloud) describeInstances(filters []*ec2.Filter) ([]*ec2.Instance, error) {
-	filters = c.tagging.addFilters(filters)
 	request := &ec2.DescribeInstancesInput{
 		Filters: filters,
 	}

staging/src/k8s.io/legacy-cloud-providers/aws/aws_loadbalancer.go

@@ -935,10 +935,10 @@ func (c *Cloud) updateInstanceSecurityGroupsForNLB(mappings []nlbPortMapping, in
 	{
 		// Server side filter
 		describeRequest := &ec2.DescribeSecurityGroupsInput{}
-		filters := []*ec2.Filter{
+		describeRequest.Filters = []*ec2.Filter{
 			newEc2Filter("ip-permission.protocol", "tcp"),
+			newEc2Filter("vpc-id", c.vpcID),
 		}
-		describeRequest.Filters = c.tagging.addFilters(filters)
 		response, err := c.ec2.DescribeSecurityGroups(describeRequest)
 		if err != nil {
 			return fmt.Errorf("Error querying security groups for NLB: %q", err)

staging/src/k8s.io/legacy-cloud-providers/aws/aws_routes.go

@@ -42,7 +42,7 @@ func (c *Cloud) findRouteTable(clusterName string) (*ec2.RouteTable, error) {
 
 		tables = response
 	} else {
-		request := &ec2.DescribeRouteTablesInput{Filters: c.tagging.addFilters(nil)}
+		request := &ec2.DescribeRouteTablesInput{}
 		response, err := c.ec2.DescribeRouteTables(request)
 		if err != nil {
 			return nil, err

staging/src/k8s.io/legacy-cloud-providers/aws/tags.go

@@ -247,9 +247,32 @@ func (t *awsTagging) addFilters(filters []*ec2.Filter) []*ec2.Filter {
 		}
 		return filters
 	}
-	// For 1.6, we always recognize the legacy tag, for the 1.5 -> 1.6 upgrade
-	// There are no "or" filters by key, so we look for both the legacy and new key, and then we have to post-filter
-	f := newEc2Filter("tag-key", TagNameKubernetesClusterLegacy, t.clusterTagKey())
+
+	f := newEc2Filter("tag-key", t.clusterTagKey())
+
+	// We can't pass a zero-length Filters to AWS (it's an error)
+	// So if we end up with no filters; we need to return nil
+	filters = append(filters, f)
+	return filters
+}
+
+// Add additional filters, to match on our tags. This uses the tag for legacy
+// 1.5 -> 1.6 clusters and exists for backwards compatibility
+//
+// This lets us run multiple k8s clusters in a single EC2 AZ
+func (t *awsTagging) addLegacyFilters(filters []*ec2.Filter) []*ec2.Filter {
+	// if there are no clusterID configured - no filtering by special tag names
+	// should be applied to revert to legacy behaviour.
+	if len(t.ClusterID) == 0 {
+		if len(filters) == 0 {
+			// We can't pass a zero-length Filters to AWS (it's an error)
+			// So if we end up with no filters; just return nil
+			return nil
+		}
+		return filters
+	}
+
+	f := newEc2Filter(fmt.Sprintf("tag:%s", TagNameKubernetesClusterLegacy), t.ClusterID)
 
 	// We can't pass a zero-length Filters to AWS (it's an error)
 	// So if we end up with no filters; we need to return nil