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nfd-master: stop node-updater pool before reconfiguring api-controller

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Prevents potential race between node-updater pool and the api-controller
when re-configuring nfd-master. Reconfiguration causes a new
api-controller instance to be created so nfd api lister might change in
the midst of processing a node update (if the pool was running). No
actual issues related to this have been identified but races (like this)
should still be avoided.
This commit is contained in:
Markus Lehtonen 2024-03-28 11:09:37 +02:00
parent 31a56acdd4
commit ba4cebb29e
1 changed files with 8 additions and 3 deletions
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11
pkg/nfd-master/nfd-master.go
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@ -350,6 +350,11 @@ func (m *nfdMaster) Run() error {
return err return err
} }
// Stop the nodeUpdaterPool so that no node updates are underway
// while we reconfigure the NFD API controller (including the
// listers) below
m.nodeUpdaterPool.stop()
// restart NFD API controller // restart NFD API controller
if m.nfdController != nil { if m.nfdController != nil {
klog.InfoS("stopping the nfd api controller") klog.InfoS("stopping the nfd api controller")
@ -361,13 +366,13 @@ func (m *nfdMaster) Run() error {
return nil return nil
} }
} }
// Restart the nodeUpdaterPool
m.nodeUpdaterPool.start(m.config.NfdApiParallelism)
// Update all nodes when the configuration changes // Update all nodes when the configuration changes
if m.nfdController != nil && features.NFDFeatureGate.Enabled(features.NodeFeatureAPI) { if m.nfdController != nil && features.NFDFeatureGate.Enabled(features.NodeFeatureAPI) {
m.nfdController.updateAllNodesChan <- struct{}{} m.nfdController.updateAllNodesChan <- struct{}{}
} }
// Restart the node updater pool
m.nodeUpdaterPool.stop()
m.nodeUpdaterPool.start(m.config.NfdApiParallelism)
case <-m.stop: case <-m.stop:
klog.InfoS("shutting down nfd-master") klog.InfoS("shutting down nfd-master")