Panic on failure to calculate index key

staging/src/k8s.io/client-go/tools/cache/thread_safe_store.go

@@ -241,7 +241,7 @@ func (c *threadSafeMap) AddIndexers(newIndexers Indexers) error {
 
 // updateIndices modifies the objects location in the managed indexes, if this is an update, you must provide an oldObj
 // updateIndices must be called from a function that already has a lock on the cache
-func (c *threadSafeMap) updateIndices(oldObj interface{}, newObj interface{}, key string) error {
+func (c *threadSafeMap) updateIndices(oldObj interface{}, newObj interface{}, key string) {
 	// if we got an old object, we need to remove it before we add it again
 	if oldObj != nil {
 		c.deleteFromIndices(oldObj, key)
@@ -249,7 +249,7 @@ func (c *threadSafeMap) updateIndices(oldObj interface{}, newObj interface{}, ke
 	for name, indexFunc := range c.indexers {
 		indexValues, err := indexFunc(newObj)
 		if err != nil {
-			return err
+			panic(fmt.Errorf("unable to calculate an index entry for key %q on index %q: %v", key, name, err))
 		}
 		index := c.indices[name]
 		if index == nil {
@@ -266,16 +266,15 @@ func (c *threadSafeMap) updateIndices(oldObj interface{}, newObj interface{}, ke
 			set.Insert(key)
 		}
 	}
-	return nil
 }
 
 // deleteFromIndices removes the object from each of the managed indexes
 // it is intended to be called from a function that already has a lock on the cache
-func (c *threadSafeMap) deleteFromIndices(obj interface{}, key string) error {
+func (c *threadSafeMap) deleteFromIndices(obj interface{}, key string) {
 	for name, indexFunc := range c.indexers {
 		indexValues, err := indexFunc(obj)
 		if err != nil {
-			return err
+			panic(fmt.Errorf("unable to calculate an index entry for key %q on index %q: %v", key, name, err))
 		}
 
 		index := c.indices[name]
@@ -289,7 +288,6 @@ func (c *threadSafeMap) deleteFromIndices(obj interface{}, key string) error {
 			}
 		}
 	}
-	return nil
 }
 
 func (c *threadSafeMap) Resync() error {