// gcEval returns whether the eval should be garbage collected given a raft
// threshold index. The eval disqualifies for garbage collection if it or its
// allocs are not older than the threshold. If the eval should be garbage
// collected, the associated alloc ids that should also be removed are also
// returned
func (c *CoreScheduler) gcEval(eval *structs.Evaluation, thresholdIndex uint64) (
bool, []string, error) {
// Ignore non-terminal and new evaluations
if !eval.TerminalStatus() || eval.ModifyIndex > thresholdIndex {
return false, nil, nil
}
// Get the allocations by eval
allocs, err := c.snap.AllocsByEval(eval.ID)
if err != nil {
c.srv.logger.Printf("[ERR] sched.core: failed to get allocs for eval %s: %v",
eval.ID, err)
return false, nil, err
}
// Scan the allocations to ensure they are terminal and old
for _, alloc := range allocs {
if !alloc.TerminalStatus() || alloc.ModifyIndex > thresholdIndex {
return false, nil, nil
}
}
allocIds := make([]string, len(allocs))
for i, alloc := range allocs {
allocIds[i] = alloc.ID
}
// Evaluation is eligible for garbage collection
return true, allocIds, nil
}
// gcEval returns whether the eval should be garbage collected given a raft
// threshold index. The eval disqualifies for garbage collection if it or its
// allocs are not older than the threshold. If the eval should be garbage
// collected, the associated alloc ids that should also be removed are also
// returned
func (c *CoreScheduler) gcEval(eval *structs.Evaluation, thresholdIndex uint64, allowBatch bool) (
bool, []string, error) {
// Ignore non-terminal and new evaluations
if !eval.TerminalStatus() || eval.ModifyIndex > thresholdIndex {
return false, nil, nil
}
// If the eval is from a running "batch" job we don't want to garbage
// collect its allocations. If there is a long running batch job and its
// terminal allocations get GC'd the scheduler would re-run the
// allocations.
if eval.Type == structs.JobTypeBatch {
if !allowBatch {
return false, nil, nil
}
// Check if the job is running
job, err := c.snap.JobByID(eval.JobID)
if err != nil {
return false, nil, err
}
// We don't want to gc anything related to a job which is not dead
if job != nil && job.Status != structs.JobStatusDead {
return false, nil, nil
}
}
// Get the allocations by eval
allocs, err := c.snap.AllocsByEval(eval.ID)
if err != nil {
c.srv.logger.Printf("[ERR] sched.core: failed to get allocs for eval %s: %v",
eval.ID, err)
return false, nil, err
}
// Scan the allocations to ensure they are terminal and old
gcEval := true
var gcAllocIDs []string
for _, alloc := range allocs {
if !alloc.TerminalStatus() || alloc.ModifyIndex > thresholdIndex {
// Can't GC the evaluation since not all of the allocations are
// terminal
gcEval = false
} else {
// The allocation is eligible to be GC'd
gcAllocIDs = append(gcAllocIDs, alloc.ID)
}
}
return gcEval, gcAllocIDs, nil
}
// evalGC is used to garbage collect old evaluations
func (c *CoreScheduler) evalGC(eval *structs.Evaluation) error {
// Iterate over the evaluations
iter, err := c.snap.Evals()
if err != nil {
return err
}
// Compute the old threshold limit for GC using the FSM
// time table. This is a rough mapping of a time to the
// Raft index it belongs to.
tt := c.srv.fsm.TimeTable()
cutoff := time.Now().UTC().Add(-1 * c.srv.config.EvalGCThreshold)
oldThreshold := tt.NearestIndex(cutoff)
c.srv.logger.Printf("[DEBUG] sched.core: eval GC: scanning before index %d (%v)",
oldThreshold, c.srv.config.EvalGCThreshold)
// Collect the allocations and evaluations to GC
var gcAlloc, gcEval []string
OUTER:
for {
raw := iter.Next()
if raw == nil {
break
}
eval := raw.(*structs.Evaluation)
// Ignore non-terminal and new evaluations
if !eval.TerminalStatus() || eval.ModifyIndex > oldThreshold {
continue
}
// Get the allocations by eval
allocs, err := c.snap.AllocsByEval(eval.ID)
if err != nil {
c.srv.logger.Printf("[ERR] sched.core: failed to get allocs for eval %s: %v",
eval.ID, err)
continue
}
// Scan the allocations to ensure they are terminal and old
for _, alloc := range allocs {
if !alloc.TerminalStatus() || alloc.ModifyIndex > oldThreshold {
continue OUTER
}
}
// Evaluation is eligible for garbage collection
gcEval = append(gcEval, eval.ID)
for _, alloc := range allocs {
gcAlloc = append(gcAlloc, alloc.ID)
}
}
// Fast-path the nothing case
if len(gcEval) == 0 && len(gcAlloc) == 0 {
return nil
}
c.srv.logger.Printf("[DEBUG] sched.core: eval GC: %d evaluations, %d allocs eligible",
len(gcEval), len(gcAlloc))
// Call to the leader to issue the reap
req := structs.EvalDeleteRequest{
Evals: gcEval,
Allocs: gcAlloc,
WriteRequest: structs.WriteRequest{
Region: c.srv.config.Region,
},
}
var resp structs.GenericResponse
if err := c.srv.RPC("Eval.Reap", &req, &resp); err != nil {
c.srv.logger.Printf("[ERR] sched.core: eval reap failed: %v", err)
return err
}
return nil
}
