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rebalance_workflow.go
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rebalance_workflow.go
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// Copyright (c) 2017-2021 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 failovermanager
import (
"context"
"go.uber.org/cadence/workflow"
"github.com/uber/cadence/common"
"github.com/uber/cadence/common/types"
)
type (
// RebalanceParams contains parameters for rebalance workflow
RebalanceParams struct {
// BatchFailoverSize is number of domains to failover in one batch
BatchFailoverSize int
// BatchFailoverWaitTimeInSeconds is the waiting time between batch failover
BatchFailoverWaitTimeInSeconds int
}
// RebalanceResult contains the result from the rebalance workflow
RebalanceResult struct {
SuccessDomains []string
FailedDomains []string
}
// DomainRebalanceData contains the result from getRebalanceDomains activity
DomainRebalanceData struct {
DomainName string
PreferredCluster string
}
)
// RebalanceWorkflow is to rebalance domains across clusters based on rebalance policy.
func RebalanceWorkflow(ctx workflow.Context, params *RebalanceParams) (*RebalanceResult, error) {
// get rebalance domains
ao := workflow.WithActivityOptions(ctx, getGetDomainsActivityOptions())
var domainData []*DomainRebalanceData
err := workflow.ExecuteActivity(ao, getRebalanceDomainsActivityName).Get(ctx, &domainData)
if err != nil {
return nil, err
}
domainPerCluster := getDomainsByCluster(domainData)
result := &RebalanceResult{
SuccessDomains: []string{},
FailedDomains: []string{},
}
// failover domains for rebalance
for cluster, domains := range domainPerCluster {
failoverParams := &FailoverParams{
TargetCluster: cluster,
BatchFailoverSize: params.BatchFailoverSize,
BatchFailoverWaitTimeInSeconds: params.BatchFailoverWaitTimeInSeconds,
}
successDomains, failedDomains := failoverDomainsByBatch(
ctx,
domains,
failoverParams,
func() {},
false,
)
result.SuccessDomains = append(result.SuccessDomains, successDomains...)
result.FailedDomains = append(result.FailedDomains, failedDomains...)
}
return result, nil
}
// GetDomainsForRebalanceActivity activity fetch domains for rebalance
func GetDomainsForRebalanceActivity(ctx context.Context) ([]*DomainRebalanceData, error) {
domains, err := getAllDomains(ctx, nil)
if err != nil {
return nil, err
}
var res []*DomainRebalanceData
for _, domain := range domains {
if shouldAllowRebalance(domain) {
domainName := domain.GetDomainInfo().GetName()
res = append(res, &DomainRebalanceData{
DomainName: domainName,
PreferredCluster: getPreferredClusterName(domain),
})
}
}
return res, nil
}
func getPreferredClusterName(domain *types.DescribeDomainResponse) string {
return domain.GetDomainInfo().GetData()[common.DomainDataKeyForPreferredCluster]
}
func shouldAllowRebalance(domain *types.DescribeDomainResponse) bool {
preferCluster := getPreferredClusterName(domain)
return isDomainFailoverManagedByCadence(domain) &&
domain.IsGlobalDomain &&
domain.GetDomainInfo().GetStatus() == types.DomainStatusRegistered &&
len(preferCluster) != 0 &&
preferCluster != domain.ReplicationConfiguration.GetActiveClusterName()
}
func getDomainsByCluster(domainData []*DomainRebalanceData) map[string][]string {
domainPerCluster := make(map[string][]string)
for _, domain := range domainData {
domainPerCluster[domain.PreferredCluster] = append(domainPerCluster[domain.PreferredCluster], domain.DomainName)
}
return domainPerCluster
}