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package balance
import (
"fmt"
"github.com/seaweedfs/seaweedfs/weed/admin/config"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb/worker_pb"
"github.com/seaweedfs/seaweedfs/weed/worker/tasks/base"
)
// Config extends BaseConfig with balance-specific settings
type Config struct {
base.BaseConfig
ImbalanceThreshold float64 `json:"imbalance_threshold"`
MinServerCount int `json:"min_server_count"`
}
// NewDefaultConfig creates a new default balance configuration
func NewDefaultConfig() *Config {
return &Config{
BaseConfig: base.BaseConfig{
Enabled: true,
ScanIntervalSeconds: 30 * 60, // 30 minutes
MaxConcurrent: 1,
},
ImbalanceThreshold: 0.2, // 20%
MinServerCount: 2,
}
}
// GetConfigSpec returns the configuration schema for balance tasks
func GetConfigSpec() base.ConfigSpec {
return base.ConfigSpec{
Fields: []*config.Field{
{
Name: "enabled",
JSONName: "enabled",
Type: config.FieldTypeBool,
DefaultValue: true,
Required: false,
DisplayName: "Enable Balance Tasks",
Description: "Whether balance tasks should be automatically created",
HelpText: "Toggle this to enable or disable automatic balance task generation",
InputType: "checkbox",
CSSClasses: "form-check-input",
},
{
Name: "scan_interval_seconds",
JSONName: "scan_interval_seconds",
Type: config.FieldTypeInterval,
DefaultValue: 30 * 60,
MinValue: 5 * 60,
MaxValue: 2 * 60 * 60,
Required: true,
DisplayName: "Scan Interval",
Description: "How often to scan for volume distribution imbalances",
HelpText: "The system will check for volume distribution imbalances at this interval",
Placeholder: "30",
Unit: config.UnitMinutes,
InputType: "interval",
CSSClasses: "form-control",
},
{
Name: "max_concurrent",
JSONName: "max_concurrent",
Type: config.FieldTypeInt,
DefaultValue: 1,
MinValue: 1,
MaxValue: 3,
Required: true,
DisplayName: "Max Concurrent Tasks",
Description: "Maximum number of balance tasks that can run simultaneously",
HelpText: "Limits the number of balance operations running at the same time",
Placeholder: "1 (default)",
Unit: config.UnitCount,
InputType: "number",
CSSClasses: "form-control",
},
{
Name: "imbalance_threshold",
JSONName: "imbalance_threshold",
Type: config.FieldTypeFloat,
DefaultValue: 0.2,
MinValue: 0.05,
MaxValue: 0.5,
Required: true,
DisplayName: "Imbalance Threshold",
Description: "Minimum imbalance ratio to trigger balancing",
HelpText: "Volume distribution imbalances above this threshold will trigger balancing",
Placeholder: "0.20 (20%)",
Unit: config.UnitNone,
InputType: "number",
CSSClasses: "form-control",
},
{
Name: "min_server_count",
JSONName: "min_server_count",
Type: config.FieldTypeInt,
DefaultValue: 2,
MinValue: 2,
MaxValue: 10,
Required: true,
DisplayName: "Minimum Server Count",
Description: "Minimum number of servers required for balancing",
HelpText: "Balancing will only occur if there are at least this many servers",
Placeholder: "2 (default)",
Unit: config.UnitCount,
InputType: "number",
CSSClasses: "form-control",
},
},
}
}
// ToTaskPolicy converts configuration to a TaskPolicy protobuf message
func (c *Config) ToTaskPolicy() *worker_pb.TaskPolicy {
return &worker_pb.TaskPolicy{
Enabled: c.Enabled,
MaxConcurrent: int32(c.MaxConcurrent),
RepeatIntervalSeconds: int32(c.ScanIntervalSeconds),
CheckIntervalSeconds: int32(c.ScanIntervalSeconds),
TaskConfig: &worker_pb.TaskPolicy_BalanceConfig{
BalanceConfig: &worker_pb.BalanceTaskConfig{
ImbalanceThreshold: float64(c.ImbalanceThreshold),
MinServerCount: int32(c.MinServerCount),
},
},
}
}
// FromTaskPolicy loads configuration from a TaskPolicy protobuf message
func (c *Config) FromTaskPolicy(policy *worker_pb.TaskPolicy) error {
if policy == nil {
return fmt.Errorf("policy is nil")
}
// Set general TaskPolicy fields
c.Enabled = policy.Enabled
c.MaxConcurrent = int(policy.MaxConcurrent)
c.ScanIntervalSeconds = int(policy.RepeatIntervalSeconds) // Direct seconds-to-seconds mapping
// Set balance-specific fields from the task config
if balanceConfig := policy.GetBalanceConfig(); balanceConfig != nil {
c.ImbalanceThreshold = float64(balanceConfig.ImbalanceThreshold)
c.MinServerCount = int(balanceConfig.MinServerCount)
}
return nil
}
// LoadConfigFromPersistence loads configuration from the persistence layer if available
func LoadConfigFromPersistence(configPersistence interface{}) *Config {
config := NewDefaultConfig()
// Try to load from persistence if available
if persistence, ok := configPersistence.(interface {
LoadBalanceTaskPolicy() (*worker_pb.TaskPolicy, error)
}); ok {
if policy, err := persistence.LoadBalanceTaskPolicy(); err == nil && policy != nil {
if err := config.FromTaskPolicy(policy); err == nil {
glog.V(1).Infof("Loaded balance configuration from persistence")
return config
}
}
}
glog.V(1).Infof("Using default balance configuration")
return config
}
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