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package plugin
import (
"sync"
"time"
)
// SchedulerLane identifies an independent scheduling track. Each lane runs
// its own goroutine, maintains its own detection timing, and acquires its
// own admin lock so that workloads in different lanes never block each other.
type SchedulerLane string
const (
// LaneDefault handles volume management operations (vacuum, balance,
// erasure coding) and admin scripts. It is the fallback lane for any
// job type that is not explicitly mapped elsewhere.
LaneDefault SchedulerLane = "default"
// LaneIceberg handles table-bucket Iceberg compaction and maintenance.
LaneIceberg SchedulerLane = "iceberg"
// LaneLifecycle handles S3 object store lifecycle management
// (expiration, transition, abort incomplete multipart uploads).
LaneLifecycle SchedulerLane = "lifecycle"
)
// AllLanes returns every defined scheduler lane in a stable order.
func AllLanes() []SchedulerLane {
return []SchedulerLane{LaneDefault, LaneIceberg, LaneLifecycle}
}
// laneIdleSleep maps each lane to its default idle sleep duration.
// Each lane can sleep for a different amount when no work is detected,
// independent of the per-job-type DetectionInterval.
var laneIdleSleep = map[SchedulerLane]time.Duration{
LaneDefault: 61 * time.Second,
LaneIceberg: 61 * time.Second,
LaneLifecycle: 5 * time.Minute,
}
// LaneIdleSleep returns the idle sleep duration for the given lane,
// falling back to defaultSchedulerIdleSleep if the lane is unknown.
func LaneIdleSleep(lane SchedulerLane) time.Duration {
if d, ok := laneIdleSleep[lane]; ok {
return d
}
return defaultSchedulerIdleSleep
}
// jobTypeLaneMap is the hardcoded mapping from job type to scheduler lane.
// Job types not present here are assigned to LaneDefault.
var jobTypeLaneMap = map[string]SchedulerLane{
// Volume management (default lane)
"vacuum": LaneDefault,
"volume_balance": LaneDefault,
"ec_balance": LaneDefault,
"erasure_coding": LaneDefault,
"admin_script": LaneDefault,
// Iceberg table maintenance
"iceberg_maintenance": LaneIceberg,
// S3 lifecycle management
"s3_lifecycle": LaneLifecycle,
}
// JobTypeLane returns the scheduler lane for the given job type.
// Unknown job types are assigned to LaneDefault.
func JobTypeLane(jobType string) SchedulerLane {
if lane, ok := jobTypeLaneMap[jobType]; ok {
return lane
}
return LaneDefault
}
// LaneJobTypes returns the set of known job types assigned to the given lane.
func LaneJobTypes(lane SchedulerLane) []string {
var result []string
for jobType, l := range jobTypeLaneMap {
if l == lane {
result = append(result, jobType)
}
}
return result
}
// schedulerLaneState holds the per-lane runtime state used by the scheduler.
type schedulerLaneState struct {
lane SchedulerLane
wakeCh chan struct{}
loopMu sync.Mutex
loop schedulerLoopState
// Per-lane execution reservation pool. Each lane tracks how many
// execution slots it has reserved on each worker independently,
// so lanes cannot starve each other.
execMu sync.Mutex
execRes map[string]int
}
// newLaneState creates a schedulerLaneState for the given lane.
func newLaneState(lane SchedulerLane) *schedulerLaneState {
return &schedulerLaneState{
lane: lane,
wakeCh: make(chan struct{}, 1),
execRes: make(map[string]int),
}
}