Kubebuilder: Field Selector spec.nodeName does not work

[mohnishkodnani]

fieldSelector := "spec.nodeName=minikube"
listOptions := &client.ListOptions{}
    if fieldSelector != "" {
        listOptions.SetFieldSelector(fieldSelector)
    }
    listOptions.Namespace = namespace
    podList := &corev1.PodList{}
    err := r.List(context.TODO(), listOptions, podList)

This returns the error

Index with name field:spec.nodeName does not exist

I tried to trace through and see the following in cachedReader.

The indexName = field:spec.nodeName and indexKey = /minikube

In thread_safe_store.go

```func (c *threadSafeMap) ByIndex(indexName, indexKey string) ([]interface{}, error) {
c.lock.RLock()
defer c.lock.RUnlock()

indexFunc := c.indexers[indexName]
if indexFunc == nil {
    return nil, fmt.Errorf("Index with name %s does not exist", indexName)
}

```

I see that the index is only on the namespace. How do i fix this or get around so that the index exists for the fields ?

[coderanger]

The only index created by default is on namespace. While you can manually add additional indexers to the same cache, it is likely easier to use an uncached client for those specific requests.

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[k8s-ci-robot]

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[mcristina422]

Following the logic in the book https://book.kubebuilder.io/cronjob-tutorial/controller-implementation.html#setup

Add this to your SetupWithManager

if err := mgr.GetFieldIndexer().IndexField(&corev1.Pod{}, "spec.nodeName", func(rawObj runtime.Object) []string {
        pod := rawObj.(*corev1.Pod)
        return []string{pod.Spec.NodeName}
    }); err != nil {
        return err
    }

[hbqhzx]

error: Index with name field:involvedObject.name does not exist
support controller-time‘s client get definite pod event

_ = mgr.GetFieldIndexer().IndexField(context.Background(), &corev1.Event{}, "involvedObject.name", func(rawObj runtime.Object) []string {
event := rawObj.(*corev1.Event)
return []string{event.InvolvedObject.Name}
})

fieldSelector, err := fields.ParseSelector("involvedObject.name" + "=" + "zx-demo-8658bdb788-65h8c")
if err != nil {
fmt.Println(err.Error())
}
if err := mgr.GetClient().List(context.Background(), &events, client.MatchingFieldsSelector{fieldSelector}); err != nil {
fmt.Println(err.Error())
}