349 lines
11 KiB
Go
349 lines
11 KiB
Go
package scheduler
|
|
|
|
// The structs and helpers in this file are split out of scheduler_system.go and
|
|
// shared by the system and sysbatch scheduler. No code in the generic scheduler
|
|
// or reconciler should use anything here! If you need something here for
|
|
// service/batch jobs, double-check it's safe to use for all scheduler types
|
|
// before moving it into util.go
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/hashicorp/nomad/nomad/structs"
|
|
)
|
|
|
|
// materializeSystemTaskGroups is used to materialize all the task groups
|
|
// a system or sysbatch job requires.
|
|
func materializeSystemTaskGroups(job *structs.Job) map[string]*structs.TaskGroup {
|
|
out := make(map[string]*structs.TaskGroup)
|
|
if job.Stopped() {
|
|
return out
|
|
}
|
|
|
|
for _, tg := range job.TaskGroups {
|
|
for i := 0; i < tg.Count; i++ {
|
|
name := fmt.Sprintf("%s.%s[%d]", job.Name, tg.Name, i)
|
|
out[name] = tg
|
|
}
|
|
}
|
|
return out
|
|
}
|
|
|
|
// diffSystemAllocsForNode is used to do a set difference between the target allocations
|
|
// and the existing allocations for a particular node. This returns 8 sets of results,
|
|
// the list of named task groups that need to be placed (no existing allocation), the
|
|
// allocations that need to be updated (job definition is newer), allocs that
|
|
// need to be migrated (node is draining), the allocs that need to be evicted
|
|
// (no longer required), those that should be ignored, those that are lost
|
|
// that need to be replaced (running on a lost node), those that are running on
|
|
// a disconnected node but may resume, and those that may still be running on
|
|
// a node that has resumed reconnected.
|
|
func diffSystemAllocsForNode(
|
|
job *structs.Job, // job whose allocs are going to be diff-ed
|
|
nodeID string,
|
|
eligibleNodes map[string]*structs.Node,
|
|
notReadyNodes map[string]struct{}, // nodes that are not ready, e.g. draining
|
|
taintedNodes map[string]*structs.Node, // nodes which are down (by node id)
|
|
required map[string]*structs.TaskGroup, // set of allocations that must exist
|
|
allocs []*structs.Allocation, // non-terminal allocations that exist
|
|
terminal structs.TerminalByNodeByName, // latest terminal allocations (by node, id)
|
|
serverSupportsDisconnectedClients bool, // flag indicating whether to apply disconnected client logic
|
|
) *diffResult {
|
|
result := new(diffResult)
|
|
|
|
// Scan the existing updates
|
|
existing := make(map[string]struct{}) // set of alloc names
|
|
for _, exist := range allocs {
|
|
// Index the existing node
|
|
name := exist.Name
|
|
existing[name] = struct{}{}
|
|
|
|
// Check for the definition in the required set
|
|
tg, ok := required[name]
|
|
|
|
// If not required, we stop the alloc
|
|
if !ok {
|
|
result.stop = append(result.stop, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: exist,
|
|
})
|
|
continue
|
|
}
|
|
|
|
supportsDisconnectedClients := exist.SupportsDisconnectedClients(serverSupportsDisconnectedClients)
|
|
|
|
reconnect := false
|
|
expired := false
|
|
|
|
// Only compute reconnect for unknown and running since they need to go
|
|
// through the reconnect process.
|
|
if supportsDisconnectedClients &&
|
|
(exist.ClientStatus == structs.AllocClientStatusUnknown ||
|
|
exist.ClientStatus == structs.AllocClientStatusRunning) {
|
|
reconnect = exist.NeedsToReconnect()
|
|
if reconnect {
|
|
expired = exist.Expired(time.Now())
|
|
}
|
|
}
|
|
|
|
// If we have been marked for migration and aren't terminal, migrate
|
|
if !exist.TerminalStatus() && exist.DesiredTransition.ShouldMigrate() {
|
|
result.migrate = append(result.migrate, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: exist,
|
|
})
|
|
continue
|
|
}
|
|
|
|
// If we are a sysbatch job and terminal, ignore (or stop?) the alloc
|
|
if job.Type == structs.JobTypeSysBatch && exist.TerminalStatus() {
|
|
result.ignore = append(result.ignore, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: exist,
|
|
})
|
|
continue
|
|
}
|
|
|
|
// Expired unknown allocs are lost. Expired checks that status is unknown.
|
|
if supportsDisconnectedClients && expired {
|
|
result.lost = append(result.lost, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: exist,
|
|
})
|
|
continue
|
|
}
|
|
|
|
// Ignore unknown allocs that we want to reconnect eventually.
|
|
if supportsDisconnectedClients &&
|
|
exist.ClientStatus == structs.AllocClientStatusUnknown &&
|
|
exist.DesiredStatus == structs.AllocDesiredStatusRun {
|
|
result.ignore = append(result.ignore, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: exist,
|
|
})
|
|
continue
|
|
}
|
|
|
|
node, nodeIsTainted := taintedNodes[exist.NodeID]
|
|
|
|
// Filter allocs on a node that is now re-connected to reconnecting.
|
|
if supportsDisconnectedClients &&
|
|
!nodeIsTainted &&
|
|
reconnect {
|
|
|
|
// Record the new ClientStatus to indicate to future evals that the
|
|
// alloc has already reconnected.
|
|
reconnecting := exist.Copy()
|
|
reconnecting.AppendState(structs.AllocStateFieldClientStatus, exist.ClientStatus)
|
|
result.reconnecting = append(result.reconnecting, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: reconnecting,
|
|
})
|
|
continue
|
|
}
|
|
|
|
// If we are on a tainted node, we must migrate if we are a service or
|
|
// if the batch allocation did not finish
|
|
if nodeIsTainted {
|
|
// If the job is batch and finished successfully, the fact that the
|
|
// node is tainted does not mean it should be migrated or marked as
|
|
// lost as the work was already successfully finished. However for
|
|
// service/system jobs, tasks should never complete. The check of
|
|
// batch type, defends against client bugs.
|
|
if exist.Job.Type == structs.JobTypeSysBatch && exist.RanSuccessfully() {
|
|
goto IGNORE
|
|
}
|
|
|
|
// Filter running allocs on a node that is disconnected to be marked as unknown.
|
|
if node != nil &&
|
|
supportsDisconnectedClients &&
|
|
node.Status == structs.NodeStatusDisconnected &&
|
|
exist.ClientStatus == structs.AllocClientStatusRunning {
|
|
|
|
disconnect := exist.Copy()
|
|
disconnect.ClientStatus = structs.AllocClientStatusUnknown
|
|
disconnect.AppendState(structs.AllocStateFieldClientStatus, structs.AllocClientStatusUnknown)
|
|
disconnect.ClientDescription = allocUnknown
|
|
result.disconnecting = append(result.disconnecting, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: disconnect,
|
|
})
|
|
continue
|
|
}
|
|
|
|
if !exist.TerminalStatus() && (node == nil || node.TerminalStatus()) {
|
|
result.lost = append(result.lost, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: exist,
|
|
})
|
|
} else {
|
|
goto IGNORE
|
|
}
|
|
|
|
continue
|
|
}
|
|
|
|
// For an existing allocation, if the nodeID is no longer
|
|
// eligible, the diff should be ignored
|
|
if _, ineligible := notReadyNodes[nodeID]; ineligible {
|
|
goto IGNORE
|
|
}
|
|
|
|
// Existing allocations on nodes that are no longer targeted
|
|
// should be stopped
|
|
if _, eligible := eligibleNodes[nodeID]; !eligible {
|
|
result.stop = append(result.stop, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: exist,
|
|
})
|
|
continue
|
|
}
|
|
|
|
// If the definition is updated we need to update
|
|
if job.JobModifyIndex != exist.Job.JobModifyIndex {
|
|
result.update = append(result.update, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: exist,
|
|
})
|
|
continue
|
|
}
|
|
|
|
// Everything is up-to-date
|
|
IGNORE:
|
|
result.ignore = append(result.ignore, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: exist,
|
|
})
|
|
}
|
|
|
|
// Scan the required groups
|
|
for name, tg := range required {
|
|
|
|
// Check for an existing allocation
|
|
if _, ok := existing[name]; !ok {
|
|
|
|
// Check for a terminal sysbatch allocation, which should be not placed
|
|
// again unless the job has been updated.
|
|
if job.Type == structs.JobTypeSysBatch {
|
|
if alloc, termExists := terminal.Get(nodeID, name); termExists {
|
|
// the alloc is terminal, but now the job has been updated
|
|
if job.JobModifyIndex != alloc.Job.JobModifyIndex {
|
|
result.update = append(result.update, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: alloc,
|
|
})
|
|
} else {
|
|
// alloc is terminal and job unchanged, leave it alone
|
|
result.ignore = append(result.ignore, allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: alloc,
|
|
})
|
|
}
|
|
continue
|
|
}
|
|
}
|
|
|
|
// Require a placement if no existing allocation. If there
|
|
// is an existing allocation, we would have checked for a potential
|
|
// update or ignore above. Ignore placements for tainted or
|
|
// ineligible nodes
|
|
|
|
// Tainted and ineligible nodes for a non existing alloc
|
|
// should be filtered out and not count towards ignore or place
|
|
if _, tainted := taintedNodes[nodeID]; tainted {
|
|
continue
|
|
}
|
|
if _, eligible := eligibleNodes[nodeID]; !eligible {
|
|
continue
|
|
}
|
|
|
|
termOnNode, _ := terminal.Get(nodeID, name)
|
|
allocTuple := allocTuple{
|
|
Name: name,
|
|
TaskGroup: tg,
|
|
Alloc: termOnNode,
|
|
}
|
|
|
|
// If the new allocation isn't annotated with a previous allocation
|
|
// or if the previous allocation isn't from the same node then we
|
|
// annotate the allocTuple with a new Allocation
|
|
if allocTuple.Alloc == nil || allocTuple.Alloc.NodeID != nodeID {
|
|
allocTuple.Alloc = &structs.Allocation{NodeID: nodeID}
|
|
}
|
|
|
|
result.place = append(result.place, allocTuple)
|
|
}
|
|
}
|
|
return result
|
|
}
|
|
|
|
// diffSystemAllocs is like diffSystemAllocsForNode however, the allocations in the
|
|
// diffResult contain the specific nodeID they should be allocated on.
|
|
func diffSystemAllocs(
|
|
job *structs.Job, // jobs whose allocations are going to be diff-ed
|
|
readyNodes []*structs.Node, // list of nodes in the ready state
|
|
notReadyNodes map[string]struct{}, // list of nodes in DC but not ready, e.g. draining
|
|
taintedNodes map[string]*structs.Node, // nodes which are down or drain mode (by node id)
|
|
allocs []*structs.Allocation, // non-terminal allocations
|
|
terminal structs.TerminalByNodeByName, // latest terminal allocations (by node id)
|
|
serverSupportsDisconnectedClients bool, // flag indicating whether to apply disconnected client logic
|
|
) *diffResult {
|
|
|
|
// Build a mapping of nodes to all their allocs.
|
|
nodeAllocs := make(map[string][]*structs.Allocation, len(allocs))
|
|
for _, alloc := range allocs {
|
|
nodeAllocs[alloc.NodeID] = append(nodeAllocs[alloc.NodeID], alloc)
|
|
}
|
|
|
|
eligibleNodes := make(map[string]*structs.Node)
|
|
for _, node := range readyNodes {
|
|
if _, ok := nodeAllocs[node.ID]; !ok {
|
|
nodeAllocs[node.ID] = nil
|
|
}
|
|
eligibleNodes[node.ID] = node
|
|
}
|
|
|
|
// Create the required task groups.
|
|
required := materializeSystemTaskGroups(job)
|
|
|
|
result := new(diffResult)
|
|
for nodeID, allocs := range nodeAllocs {
|
|
diff := diffSystemAllocsForNode(job, nodeID, eligibleNodes, notReadyNodes, taintedNodes, required, allocs, terminal, serverSupportsDisconnectedClients)
|
|
result.Append(diff)
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
// evictAndPlace is used to mark allocations for evicts and add them to the
|
|
// placement queue. evictAndPlace modifies both the diffResult and the
|
|
// limit. It returns true if the limit has been reached.
|
|
func evictAndPlace(ctx Context, diff *diffResult, allocs []allocTuple, desc string, limit *int) bool {
|
|
n := len(allocs)
|
|
for i := 0; i < n && i < *limit; i++ {
|
|
a := allocs[i]
|
|
ctx.Plan().AppendStoppedAlloc(a.Alloc, desc, "", "")
|
|
diff.place = append(diff.place, a)
|
|
}
|
|
if n <= *limit {
|
|
*limit -= n
|
|
return false
|
|
}
|
|
*limit = 0
|
|
return true
|
|
}
|