Add an AddIfNotPresent function to support single producer/consumer
retry scenarios. Provides the consumer with a means to prefer items
already enqueued by the producer at the point of retry.
Revise our code to only call Request.Namespace() if a namespace
*should* be present. For root scoped resources, namespace should
be ignored. For namespaced resources, it is an error to have
Namespace=="".
Without the ability to retrieve underlying items by key (instead of
the object passed to KeyFunc) it is impossible to build wrappers
around cache.Store that want to make decisions about keys, because
they would need to reconstruct the object passed to Get.
This allows retrieval by key, and makes sure Get(obj) uses it.
Support namespacing in cache.Store by framing the interface functions
around interface{} and providing a key function to each Store implementation.
Implementation of a fix for #2294.
I would like to use these in kubelet and kube-proxy.
This is the minimal change to get them moved.
I will follow up with changes to make interfaces consistent
and add Listers for other resources.
Scheduler uses Reflector from pkg/client/cache.
It defines some helper classes.
I'd like to use those helpers with pkg/client/cache
in kube-proxy and kubelet too.
Watch depends on long running connections, which intervening proxies
may break without the control of the remote server. Specific errors
handled are io.EOF, io.EOF wrapped by *url.Error, http connection
reset errors (caused by race conditions in golang http code), and
connection reset by peer (simply tolerated).
Watches are often established via long-running HTTP GET requests which
will inevitably time out during the normal course of operations. When
the watches time out, an io.EOF or an io.ErrUnexpectedEOF will bubble
up to client components such as StreamWatcher and Reflector. Treat EOF
as a clean watch termination. Treat ErrUnexpectedEOF as a less-clean
but non-fatal watch termination and log the event at the warning level.
This greatly reduces the amount of log noise generated during what is
ultimately normal operation, and adds the flexibility for the operator
to make a distinction between the EOF conditions if so desired (by
adjusting the logging level).
Prepares for the meta object to front multiple underlying types
when TypeMeta and ObjectMeta is split in internal and v1beta3, but
combined in v1beta1 and v1beta2
Keep the FIFO's internal set in sync with the queue during Add/Update
operations to prevent a queue line-jumping scenario (described in a
new unit test).
Allows us to define different watch versioning regimes in the future
as well as to encode information with the resource version.
This changes /watch/resources?resourceVersion=3 to start the watch at
4 instead of 3, which means clients can read a resource version and
then send it back to the server. Clients should no longer do math on
resource versions.
nikhiljindal