"encoding/json"
"fmt"
"math/big"
+ "strconv"
"sync"
"sync/atomic"
"time"
)
type ec2InstanceSetConfig struct {
- AccessKeyID string
- SecretAccessKey string
- Region string
- SecurityGroupIDs arvados.StringSet
- SubnetID string
- AdminUsername string
- EBSVolumeType string
- IAMInstanceProfile string
+ AccessKeyID string
+ SecretAccessKey string
+ Region string
+ SecurityGroupIDs arvados.StringSet
+ SubnetID string
+ AdminUsername string
+ EBSVolumeType string
+ EBSPrice float64
+ IAMInstanceProfile string
+ SpotPriceUpdateInterval arvados.Duration
}
type ec2Interface interface {
ImportKeyPair(input *ec2.ImportKeyPairInput) (*ec2.ImportKeyPairOutput, error)
RunInstances(input *ec2.RunInstancesInput) (*ec2.Reservation, error)
DescribeInstances(input *ec2.DescribeInstancesInput) (*ec2.DescribeInstancesOutput, error)
+ DescribeInstanceStatusPages(input *ec2.DescribeInstanceStatusInput, fn func(*ec2.DescribeInstanceStatusOutput, bool) bool) error
+ DescribeSpotPriceHistoryPages(input *ec2.DescribeSpotPriceHistoryInput, fn func(*ec2.DescribeSpotPriceHistoryOutput, bool) bool) error
CreateTags(input *ec2.CreateTagsInput) (*ec2.CreateTagsOutput, error)
TerminateInstances(input *ec2.TerminateInstancesInput) (*ec2.TerminateInstancesOutput, error)
}
keys map[string]string
throttleDelayCreate atomic.Value
throttleDelayInstances atomic.Value
+
+ prices map[priceKey][]cloud.InstancePrice
+ pricesLock sync.Mutex
+ pricesUpdated map[priceKey]time.Time
}
func newEC2InstanceSet(config json.RawMessage, instanceSetID cloud.InstanceSetID, _ cloud.SharedResourceTags, logger logrus.FieldLogger) (prv cloud.InstanceSet, err error) {
if err != nil {
return nil, err
}
-
return &ec2Instance{
provider: instanceSet,
instance: rsv.Instances[0],
Values: []*string{aws.String(v)},
})
}
+ needAZs := false
dii := &ec2.DescribeInstancesInput{Filters: filters}
for {
dio, err := instanceSet.client.DescribeInstances(dii)
for _, rsv := range dio.Reservations {
for _, inst := range rsv.Instances {
if *inst.State.Name != "shutting-down" && *inst.State.Name != "terminated" {
- instances = append(instances, &ec2Instance{instanceSet, inst})
+ instances = append(instances, &ec2Instance{
+ provider: instanceSet,
+ instance: inst,
+ })
+ if aws.StringValue(inst.InstanceLifecycle) == "spot" {
+ needAZs = true
+ }
}
}
}
if dio.NextToken == nil {
- return instances, err
+ break
}
dii.NextToken = dio.NextToken
}
+ if needAZs && instanceSet.ec2config.SpotPriceUpdateInterval > 0 {
+ az := map[string]string{}
+ err := instanceSet.client.DescribeInstanceStatusPages(&ec2.DescribeInstanceStatusInput{
+ IncludeAllInstances: aws.Bool(true),
+ }, func(page *ec2.DescribeInstanceStatusOutput, lastPage bool) bool {
+ for _, ent := range page.InstanceStatuses {
+ az[*ent.InstanceId] = *ent.AvailabilityZone
+ }
+ return true
+ })
+ if err != nil {
+ instanceSet.logger.Warnf("error getting instance statuses: %s", err)
+ }
+ for _, inst := range instances {
+ inst := inst.(*ec2Instance)
+ inst.availabilityZone = az[*inst.instance.InstanceId]
+ }
+ instanceSet.updateSpotPrices(instances)
+ }
+ return instances, err
+}
+
+type priceKey struct {
+ instanceType string
+ spot bool
+ availabilityZone string
+}
+
+// Refresh recent spot instance pricing data for the given instances,
+// unless we already have recent pricing data for all relevant types.
+func (instanceSet *ec2InstanceSet) updateSpotPrices(instances []cloud.Instance) {
+ if len(instances) == 0 {
+ return
+ }
+
+ instanceSet.pricesLock.Lock()
+ defer instanceSet.pricesLock.Unlock()
+ if instanceSet.prices == nil {
+ instanceSet.prices = map[priceKey][]cloud.InstancePrice{}
+ instanceSet.pricesUpdated = map[priceKey]time.Time{}
+ }
+
+ updateTime := time.Now()
+ staleTime := updateTime.Add(-instanceSet.ec2config.SpotPriceUpdateInterval.Duration())
+ needUpdate := false
+ allTypes := map[string]bool{}
+
+ for _, inst := range instances {
+ ec2inst := inst.(*ec2Instance).instance
+ if aws.StringValue(ec2inst.InstanceLifecycle) == "spot" {
+ pk := priceKey{
+ instanceType: *ec2inst.InstanceType,
+ spot: true,
+ availabilityZone: inst.(*ec2Instance).availabilityZone,
+ }
+ if instanceSet.pricesUpdated[pk].Before(staleTime) {
+ needUpdate = true
+ }
+ allTypes[*ec2inst.InstanceType] = true
+ }
+ }
+ if !needUpdate {
+ return
+ }
+ var typeFilterValues []*string
+ for instanceType := range allTypes {
+ typeFilterValues = append(typeFilterValues, aws.String(instanceType))
+ }
+ // Get 3x update interval worth of pricing data. (Ideally the
+ // AWS API would tell us "we have shown you all of the price
+ // changes up to time T", but it doesn't, so we'll just ask
+ // for 3 intervals worth of data on each update, de-duplicate
+ // the data points, and not worry too much about occasionally
+ // missing some data points when our lookups fail twice in a
+ // row.
+ dsphi := &ec2.DescribeSpotPriceHistoryInput{
+ StartTime: aws.Time(updateTime.Add(-3 * instanceSet.ec2config.SpotPriceUpdateInterval.Duration())),
+ Filters: []*ec2.Filter{
+ &ec2.Filter{Name: aws.String("instance-type"), Values: typeFilterValues},
+ &ec2.Filter{Name: aws.String("product-description"), Values: []*string{aws.String("Linux/UNIX")}},
+ },
+ }
+ err := instanceSet.client.DescribeSpotPriceHistoryPages(dsphi, func(page *ec2.DescribeSpotPriceHistoryOutput, lastPage bool) bool {
+ for _, ent := range page.SpotPriceHistory {
+ if ent.InstanceType == nil || ent.SpotPrice == nil || ent.Timestamp == nil {
+ // bogus record?
+ continue
+ }
+ price, err := strconv.ParseFloat(*ent.SpotPrice, 64)
+ if err != nil {
+ // bogus record?
+ continue
+ }
+ pk := priceKey{
+ instanceType: *ent.InstanceType,
+ spot: true,
+ availabilityZone: *ent.AvailabilityZone,
+ }
+ instanceSet.prices[pk] = append(instanceSet.prices[pk], cloud.InstancePrice{
+ StartTime: *ent.Timestamp,
+ Price: price,
+ })
+ instanceSet.pricesUpdated[pk] = updateTime
+ }
+ return true
+ })
+ if err != nil {
+ instanceSet.logger.Warnf("error retrieving spot instance prices: %s", err)
+ }
+
+ expiredTime := updateTime.Add(-64 * instanceSet.ec2config.SpotPriceUpdateInterval.Duration())
+ for pk, last := range instanceSet.pricesUpdated {
+ if last.Before(expiredTime) {
+ delete(instanceSet.pricesUpdated, pk)
+ delete(instanceSet.prices, pk)
+ }
+ }
+ for pk, prices := range instanceSet.prices {
+ instanceSet.prices[pk] = cloud.NormalizePriceHistory(prices)
+ }
}
func (instanceSet *ec2InstanceSet) Stop() {
}
type ec2Instance struct {
- provider *ec2InstanceSet
- instance *ec2.Instance
+ provider *ec2InstanceSet
+ instance *ec2.Instance
+ availabilityZone string // sometimes available for spot instances
}
func (inst *ec2Instance) ID() cloud.InstanceID {
return cloud.ErrNotImplemented
}
+// PriceHistory returns the price history for this specific instance.
+//
+// AWS documentation is elusive about whether the hourly cost of a
+// given spot instance changes as the current spot price changes for
+// the corresponding instance type and availability zone. Our
+// implementation assumes the answer is yes, based on the following
+// hints.
+//
+// https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-requests.html
+// says: "After your Spot Instance is running, if the Spot price rises
+// above your maximum price, Amazon EC2 interrupts your Spot
+// Instance." (This doesn't address what happens when the spot price
+// rises *without* exceeding your maximum price.)
+//
+// https://docs.aws.amazon.com/whitepapers/latest/cost-optimization-leveraging-ec2-spot-instances/how-spot-instances-work.html
+// says: "You pay the Spot price that's in effect, billed to the
+// nearest second." (But it's not explicitly stated whether "the price
+// in effect" changes over time for a given instance.)
+//
+// The same page also says, in a discussion about the effect of
+// specifying a maximum price: "Note that you never pay more than the
+// Spot price that is in effect when your Spot Instance is running."
+// (The use of the phrase "is running", as opposed to "was launched",
+// hints that pricing is dynamic.)
+func (inst *ec2Instance) PriceHistory(instType arvados.InstanceType) []cloud.InstancePrice {
+ inst.provider.pricesLock.Lock()
+ defer inst.provider.pricesLock.Unlock()
+ // Note updateSpotPrices currently populates
+ // inst.provider.prices only for spot instances, so if
+ // spot==false here, we will return no data.
+ pk := priceKey{
+ instanceType: *inst.instance.InstanceType,
+ spot: aws.StringValue(inst.instance.InstanceLifecycle) == "spot",
+ availabilityZone: inst.availabilityZone,
+ }
+ var prices []cloud.InstancePrice
+ for _, price := range inst.provider.prices[pk] {
+ // ceil(added scratch space in GiB)
+ gib := (instType.AddedScratch + 1<<30 - 1) >> 30
+ monthly := inst.provider.ec2config.EBSPrice * float64(gib)
+ hourly := monthly / 30 / 24
+ price.Price += hourly
+ prices = append(prices, price)
+ }
+ return prices
+}
+
type rateLimitError struct {
error
earliestRetry time.Time
projects / arvados.git / blobdiff