In Kubernetes controller what's the preferred way to get an item from the informer cache?
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I am looking at following 2 examples, in the first example A lister is used to retrieve the item.
In the second example , an index is used.
I am wondering which is the preferred way and way to retrieve an element from the local cache.
controller
kubernetes kube-controller-manager asked Nov 24 '18 at 0:08
Always_BeginnerAlways_Beginner
48711017
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2
I am looking at following 2 examples, in the first example A lister is used to retrieve the item.
In the second example , an index is used.
I am wondering which is the preferred way and way to retrieve an element from the local cache.
controller
kubernetes kube-controller-manager asked Nov 24 '18 at 0:08
Always_BeginnerAlways_Beginner
48711017
add a comment |
2
2
2
I am looking at following 2 examples, in the first example A lister is used to retrieve the item.
In the second example , an index is used.
I am wondering which is the preferred way and way to retrieve an element from the local cache.
controller
kubernetes kube-controller-manager asked Nov 24 '18 at 0:08
Always_BeginnerAlways_Beginner
48711017
I am looking at following 2 examples, in the first example A lister is used to retrieve the item.
In the second example , an index is used.
I am wondering which is the preferred way and way to retrieve an element from the local cache.
controller
kubernetes kube-controller-manager controller
kubernetes kube-controller-manager asked Nov 24 '18 at 0:08
Always_BeginnerAlways_Beginner
48711017
asked Nov 24 '18 at 0:08
Always_BeginnerAlways_Beginner
48711017
asked Nov 24 '18 at 0:08
Always_BeginnerAlways_Beginner
48711017
asked Nov 24 '18 at 0:08
Always_BeginnerAlways_Beginner
48711017
asked Nov 24 '18 at 0:08
Always_BeginnerAlways_Beginner
48711017
48711017
add a comment |
add a comment |
1 Answer
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The examples you showed above, they both use indexer, if you go deeper you will see it.
For First example (see here)
// Get retrieves the Node from the index for a given name.
func (s *nodeLister) Get(name string) (*v1.Node, error) {
obj, exists, err := s.indexer.GetByKey(name)
if err != nil {
return nil, err
}
if !exists {
return nil, errors.NewNotFound(v1.Resource("node"), name)
}
return obj.(*v1.Node), nil
}
For second example
item, exists, err := c.informer.GetIndexer().GetByKey(keyRaw)
answered Nov 24 '18 at 5:13
nightfury1204nightfury1204
1,779510
Right, thanks for pointing out. So for writing a custom controller either of the ways can be used right?
– Always_Beginner
Nov 24 '18 at 10:05
1
Right. I used thisc.Informer.GetIndexer().GetByKey(key). all the time
– nightfury1204
Nov 24 '18 at 10:12
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
The examples you showed above, they both use indexer, if you go deeper you will see it.
For First example (see here)
// Get retrieves the Node from the index for a given name.
func (s *nodeLister) Get(name string) (*v1.Node, error) {
obj, exists, err := s.indexer.GetByKey(name)
if err != nil {
return nil, err
}
if !exists {
return nil, errors.NewNotFound(v1.Resource("node"), name)
}
return obj.(*v1.Node), nil
}
For second example
item, exists, err := c.informer.GetIndexer().GetByKey(keyRaw)
answered Nov 24 '18 at 5:13
nightfury1204nightfury1204
1,779510
Right, thanks for pointing out. So for writing a custom controller either of the ways can be used right?
– Always_Beginner
Nov 24 '18 at 10:05
1
Right. I used thisc.Informer.GetIndexer().GetByKey(key). all the time
– nightfury1204
Nov 24 '18 at 10:12
add a comment |
2
The examples you showed above, they both use indexer, if you go deeper you will see it.
For First example (see here)
// Get retrieves the Node from the index for a given name.
func (s *nodeLister) Get(name string) (*v1.Node, error) {
obj, exists, err := s.indexer.GetByKey(name)
if err != nil {
return nil, err
}
if !exists {
return nil, errors.NewNotFound(v1.Resource("node"), name)
}
return obj.(*v1.Node), nil
}
For second example
item, exists, err := c.informer.GetIndexer().GetByKey(keyRaw)
answered Nov 24 '18 at 5:13
nightfury1204nightfury1204
1,779510
Right, thanks for pointing out. So for writing a custom controller either of the ways can be used right?
– Always_Beginner
Nov 24 '18 at 10:05
1
Right. I used thisc.Informer.GetIndexer().GetByKey(key). all the time
– nightfury1204
Nov 24 '18 at 10:12
add a comment |
2
2
2
The examples you showed above, they both use indexer, if you go deeper you will see it.
For First example (see here)
// Get retrieves the Node from the index for a given name.
func (s *nodeLister) Get(name string) (*v1.Node, error) {
obj, exists, err := s.indexer.GetByKey(name)
if err != nil {
return nil, err
}
if !exists {
return nil, errors.NewNotFound(v1.Resource("node"), name)
}
return obj.(*v1.Node), nil
}
For second example
item, exists, err := c.informer.GetIndexer().GetByKey(keyRaw)
answered Nov 24 '18 at 5:13
nightfury1204nightfury1204
1,779510
The examples you showed above, they both use indexer, if you go deeper you will see it.
For First example (see here)
// Get retrieves the Node from the index for a given name.
func (s *nodeLister) Get(name string) (*v1.Node, error) {
obj, exists, err := s.indexer.GetByKey(name)
if err != nil {
return nil, err
}
if !exists {
return nil, errors.NewNotFound(v1.Resource("node"), name)
}
return obj.(*v1.Node), nil
}
For second example
item, exists, err := c.informer.GetIndexer().GetByKey(keyRaw)
answered Nov 24 '18 at 5:13
nightfury1204nightfury1204
1,779510
answered Nov 24 '18 at 5:13
nightfury1204nightfury1204
1,779510
answered Nov 24 '18 at 5:13
nightfury1204nightfury1204
1,779510
answered Nov 24 '18 at 5:13
nightfury1204nightfury1204
1,779510
1,779510
Right, thanks for pointing out. So for writing a custom controller either of the ways can be used right?
– Always_Beginner
Nov 24 '18 at 10:05
1
Right. I used thisc.Informer.GetIndexer().GetByKey(key). all the time
– nightfury1204
Nov 24 '18 at 10:12
add a comment |
Right, thanks for pointing out. So for writing a custom controller either of the ways can be used right?
– Always_Beginner
Nov 24 '18 at 10:05
1
Right. I used thisc.Informer.GetIndexer().GetByKey(key). all the time
– nightfury1204
Nov 24 '18 at 10:12
Right, thanks for pointing out. So for writing a custom controller either of the ways can be used right?
– Always_Beginner
Nov 24 '18 at 10:05
Right, thanks for pointing out. So for writing a custom controller either of the ways can be used right?
– Always_Beginner
Nov 24 '18 at 10:05
1
1
Right. I used this
c.Informer.GetIndexer().GetByKey(key). all the time– nightfury1204
Nov 24 '18 at 10:12
Right. I used this
c.Informer.GetIndexer().GetByKey(key). all the time– nightfury1204
Nov 24 '18 at 10:12
add a comment |
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