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cluster.go
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cluster.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package local
import (
"errors"
"fmt"
"io"
"sync"
"time"
"github.com/m3db/m3/src/dbnode/client"
"github.com/m3db/m3/src/query/storage"
xerrors "github.com/m3db/m3x/errors"
"github.com/m3db/m3x/ident"
)
var (
errNamespaceIDNotSet = errors.New("namespace ID not set")
errSessionNotSet = errors.New("session not set")
errRetentionNotSet = errors.New("retention not set")
errResolutionNotSet = errors.New("resolution not set")
)
// Clusters is a flattened collection of local storage clusters and namespaces.
type Clusters interface {
io.Closer
// ClusterNamespaces returns all known cluster namespaces.
ClusterNamespaces() ClusterNamespaces
// UnaggregatedClusterNamespace returns the valid unaggregated
// cluster namespace.
UnaggregatedClusterNamespace() ClusterNamespace
// AggregatedClusterNamespace returns an aggregated cluster namespace
// at a specific retention and resolution.
AggregatedClusterNamespace(attrs RetentionResolution) (ClusterNamespace, bool)
}
// RetentionResolution is a tuple of retention and resolution that describes
// an aggregated metrics policy.
type RetentionResolution struct {
Retention time.Duration
Resolution time.Duration
}
// ClusterNamespace is a local storage cluster namespace.
type ClusterNamespace interface {
NamespaceID() ident.ID
Attributes() storage.Attributes
Session() client.Session
}
// ClusterNamespaces is a slice of ClusterNamespace instances.
type ClusterNamespaces []ClusterNamespace
// NumAggregatedClusterNamespaces returns the number of aggregated
// cluster namespaces.
func (n ClusterNamespaces) NumAggregatedClusterNamespaces() int {
count := 0
for _, namespace := range n {
if namespace.Attributes().MetricsType == storage.AggregatedMetricsType {
count++
}
}
return count
}
// UnaggregatedClusterNamespaceDefinition is the definition for the
// cluster namespace that holds unaggregated metrics data.
type UnaggregatedClusterNamespaceDefinition struct {
NamespaceID ident.ID
Session client.Session
Retention time.Duration
}
// Validate will validate the cluster namespace definition.
func (def UnaggregatedClusterNamespaceDefinition) Validate() error {
if def.NamespaceID == nil || len(def.NamespaceID.String()) == 0 {
return errNamespaceIDNotSet
}
if def.Session == nil {
return errSessionNotSet
}
if def.Retention <= 0 {
return errRetentionNotSet
}
return nil
}
// AggregatedClusterNamespaceDefinition is a definition for a
// cluster namespace that holds aggregated metrics data at a
// specific retention and resolution.
type AggregatedClusterNamespaceDefinition struct {
NamespaceID ident.ID
Session client.Session
Retention time.Duration
Resolution time.Duration
}
// Validate validates the cluster namespace definition.
func (def AggregatedClusterNamespaceDefinition) Validate() error {
if def.NamespaceID == nil || len(def.NamespaceID.String()) == 0 {
return errNamespaceIDNotSet
}
if def.Session == nil {
return errSessionNotSet
}
if def.Retention <= 0 {
return errRetentionNotSet
}
if def.Resolution <= 0 {
return errResolutionNotSet
}
return nil
}
type clusters struct {
namespaces []ClusterNamespace
unaggregatedNamespace ClusterNamespace
aggregatedNamespaces map[RetentionResolution]ClusterNamespace
}
// NewClusters instantiates a new Clusters instance.
func NewClusters(
unaggregatedClusterNamespace UnaggregatedClusterNamespaceDefinition,
aggregatedClusterNamespaces ...AggregatedClusterNamespaceDefinition,
) (Clusters, error) {
expectedAggregated := len(aggregatedClusterNamespaces)
expectedAll := 1 + expectedAggregated
namespaces := make(ClusterNamespaces, 0, expectedAll)
aggregatedNamespaces := make(map[RetentionResolution]ClusterNamespace,
expectedAggregated)
def := unaggregatedClusterNamespace
unaggregatedNamespace, err := newUnaggregatedClusterNamespace(def)
if err != nil {
return nil, err
}
namespaces = append(namespaces, unaggregatedNamespace)
for _, def := range aggregatedClusterNamespaces {
namespace, err := newAggregatedClusterNamespace(def)
if err != nil {
return nil, err
}
namespaces = append(namespaces, namespace)
key := RetentionResolution{
Retention: namespace.Attributes().Retention,
Resolution: namespace.Attributes().Resolution,
}
_, exists := aggregatedNamespaces[key]
if exists {
return nil, fmt.Errorf("duplicate aggregated namespace exists for: "+
"retention=%s, resolution=%s",
key.Retention.String(), key.Resolution.String())
}
aggregatedNamespaces[key] = namespace
}
return &clusters{
namespaces: namespaces,
unaggregatedNamespace: unaggregatedNamespace,
aggregatedNamespaces: aggregatedNamespaces,
}, nil
}
func (c *clusters) ClusterNamespaces() ClusterNamespaces {
return c.namespaces
}
func (c *clusters) UnaggregatedClusterNamespace() ClusterNamespace {
return c.unaggregatedNamespace
}
func (c *clusters) AggregatedClusterNamespace(
attrs RetentionResolution,
) (ClusterNamespace, bool) {
namespace, ok := c.aggregatedNamespaces[attrs]
return namespace, ok
}
func (c *clusters) Close() error {
var (
wg sync.WaitGroup
syncMultiErrs syncMultiErrs
uniqueSessions []client.Session
)
// Collect unique sessions, some namespaces may share same
// client session (same cluster)
uniqueSessions = append(uniqueSessions, c.unaggregatedNamespace.Session())
for _, namespace := range c.aggregatedNamespaces {
unique := true
for _, session := range uniqueSessions {
if namespace.Session() == session {
unique = false
break
}
}
if unique {
uniqueSessions = append(uniqueSessions, namespace.Session())
}
}
for _, session := range uniqueSessions {
session := session // Capture for lambda
wg.Add(1)
go func() {
defer wg.Done()
err := session.Close()
syncMultiErrs.add(err)
}()
}
wg.Wait()
return syncMultiErrs.finalError()
}
type clusterNamespace struct {
namespaceID ident.ID
attributes storage.Attributes
session client.Session
}
func newUnaggregatedClusterNamespace(
def UnaggregatedClusterNamespaceDefinition,
) (ClusterNamespace, error) {
if err := def.Validate(); err != nil {
return nil, err
}
return &clusterNamespace{
namespaceID: def.NamespaceID,
attributes: storage.Attributes{
MetricsType: storage.UnaggregatedMetricsType,
Retention: def.Retention,
},
session: def.Session,
}, nil
}
func newAggregatedClusterNamespace(
def AggregatedClusterNamespaceDefinition,
) (ClusterNamespace, error) {
if err := def.Validate(); err != nil {
return nil, err
}
return &clusterNamespace{
namespaceID: def.NamespaceID,
attributes: storage.Attributes{
MetricsType: storage.AggregatedMetricsType,
Retention: def.Retention,
Resolution: def.Resolution,
},
session: def.Session,
}, nil
}
func (n *clusterNamespace) NamespaceID() ident.ID {
return n.namespaceID
}
func (n *clusterNamespace) Attributes() storage.Attributes {
return n.attributes
}
func (n *clusterNamespace) Session() client.Session {
return n.session
}
type syncMultiErrs struct {
sync.Mutex
multiErr xerrors.MultiError
}
func (errs *syncMultiErrs) add(err error) {
errs.Lock()
errs.multiErr = errs.multiErr.Add(err)
errs.Unlock()
}
func (errs *syncMultiErrs) finalError() error {
errs.Lock()
defer errs.Unlock()
return errs.multiErr.FinalError()
}