예제 #1
0
파일: context.go 프로젝트: achanda/nomad
func (e *EvalContext) ProposedAllocs(nodeID string) ([]*structs.Allocation, error) {
	// Get the existing allocations that are non-terminal
	existingAlloc, err := e.state.AllocsByNodeTerminal(nodeID, false)
	if err != nil {
		return nil, err
	}

	// Determine the proposed allocation by first removing allocations
	// that are planned evictions and adding the new allocations.
	proposed := existingAlloc
	if update := e.plan.NodeUpdate[nodeID]; len(update) > 0 {
		proposed = structs.RemoveAllocs(existingAlloc, update)
	}

	// We create an index of the existing allocations so that if an inplace
	// update occurs, we do not double count and we override the old allocation.
	proposedIDs := make(map[string]*structs.Allocation, len(proposed))
	for _, alloc := range proposed {
		proposedIDs[alloc.ID] = alloc
	}
	for _, alloc := range e.plan.NodeAllocation[nodeID] {
		proposedIDs[alloc.ID] = alloc
	}

	// Materialize the proposed slice
	proposed = make([]*structs.Allocation, 0, len(proposedIDs))
	for _, alloc := range proposedIDs {
		proposed = append(proposed, alloc)
	}

	return proposed, nil
}
예제 #2
0
// evaluateNodePlan is used to evalute the plan for a single node,
// returning if the plan is valid or if an error is encountered
func evaluateNodePlan(snap *state.StateSnapshot, plan *structs.Plan, nodeID string) (bool, error) {
	// If this is an evict-only plan, it always 'fits' since we are removing things.
	if len(plan.NodeAllocation[nodeID]) == 0 {
		return true, nil
	}

	// Get the node itself
	node, err := snap.NodeByID(nodeID)
	if err != nil {
		return false, fmt.Errorf("failed to get node '%s': %v", nodeID, err)
	}

	// If the node does not exist or is not ready for schduling it is not fit
	// XXX: There is a potential race between when we do this check and when
	// the Raft commit happens.
	if node == nil || node.Status != structs.NodeStatusReady || node.Drain {
		return false, nil
	}

	// Get the existing allocations
	existingAlloc, err := snap.AllocsByNode(nodeID)
	if err != nil {
		return false, fmt.Errorf("failed to get existing allocations for '%s': %v", nodeID, err)
	}

	// Filter on alloc state
	existingAlloc = structs.FilterTerminalAllocs(existingAlloc)

	// Determine the proposed allocation by first removing allocations
	// that are planned evictions and adding the new allocations.
	proposed := existingAlloc
	var remove []*structs.Allocation
	if update := plan.NodeUpdate[nodeID]; len(update) > 0 {
		remove = append(remove, update...)
	}
	if updated := plan.NodeAllocation[nodeID]; len(updated) > 0 {
		for _, alloc := range updated {
			remove = append(remove, alloc)
		}
	}
	proposed = structs.RemoveAllocs(existingAlloc, remove)
	proposed = append(proposed, plan.NodeAllocation[nodeID]...)

	// Check if these allocations fit
	fit, _, _, err := structs.AllocsFit(node, proposed, nil)
	return fit, err
}
예제 #3
0
파일: context.go 프로젝트: dgshep/nomad
func (e *EvalContext) ProposedAllocs(nodeID string) ([]*structs.Allocation, error) {
	// Get the existing allocations that are non-terminal
	existingAlloc, err := e.state.AllocsByNodeTerminal(nodeID, false)
	if err != nil {
		return nil, err
	}

	// Determine the proposed allocation by first removing allocations
	// that are planned evictions and adding the new allocations.
	proposed := existingAlloc
	if update := e.plan.NodeUpdate[nodeID]; len(update) > 0 {
		proposed = structs.RemoveAllocs(existingAlloc, update)
	}
	proposed = append(proposed, e.plan.NodeAllocation[nodeID]...)

	// Ensure the return is not nil
	if proposed == nil {
		proposed = make([]*structs.Allocation, 0)
	}
	return proposed, nil
}