[pve-devel] [PATCH v2 ha-manager 13/15] usage: static: use service count on nodes as a fallback

[Fiona Ebner]

if something goes wrong with the TOPSIS scoring. Not expected to
happen, but it's rather cheap to be on the safe side.

Signed-off-by: Fiona Ebner <f.ebner at proxmox.com>
---

New in v2.

 src/PVE/HA/Usage/Static.pm | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/PVE/HA/Usage/Static.pm b/src/PVE/HA/Usage/Static.pm
index ce705eb..73ce836 100644
--- a/src/PVE/HA/Usage/Static.pm
+++ b/src/PVE/HA/Usage/Static.pm
@@ -22,12 +22,15 @@ sub new {
 	'service-stats' => {},
 	haenv => $haenv,
 	scheduler => $scheduler,
+	'service-counts' => {}, # Service count on each node. Fallback if scoring calculation fails.
     }, $class;
 }
 
 sub add_node {
     my ($self, $nodename) = @_;
 
+    $self->{'service-counts'}->{$nodename} = 0;
+
     my $stats = $self->{'node-stats'}->{$nodename}
 	or die "did not get static node usage information for '$nodename'\n";
     die "static node usage information for '$nodename' missing cpu count\n" if !$stats->{cpus};
@@ -40,6 +43,8 @@ sub add_node {
 sub remove_node {
     my ($self, $nodename) = @_;
 
+    delete $self->{'service-counts'}->{$nodename};
+
     $self->{scheduler}->remove_node($nodename);
 }
 
@@ -83,6 +88,8 @@ my sub get_service_usage {
 sub add_service_usage_to_node {
     my ($self, $nodename, $sid, $service_node, $migration_target) = @_;
 
+    $self->{'service-counts'}->{$nodename}++;
+
     eval {
 	my $service_usage = get_service_usage($self, $sid, $service_node, $migration_target);
 	$self->{scheduler}->add_service_usage_to_node($nodename, $service_usage);
@@ -103,8 +110,7 @@ sub score_nodes_to_start_service {
 	    'err',
 	    "unable to score nodes according to static usage for service '$sid' - $err",
 	);
-	# TODO maybe use service count as fallback?
-	return { map { $_ => 1 } $self->list_nodes() };
+	return $self->{'service-counts'};
     }
 
     # Take minus the value, so that a lower score is better, which our caller(s) expect(s).
-- 
2.30.2