The routing LB policy should immediately the Channel's picker that delegates picking to the updated routes. Otherwise, new RPCs will keep being sent through old routes even if they are removed. This change also includes the fix for syncing state change for child balancers in deactivated state.
- Add support for send_all_clusters field in LRS response. When it is set to true, just send load reports for clusters that the client is currently tracking (aka, is sending load to).
- The actual load report interval (in each ClusterStats message, which contains the stats for each cluster:eds_service) should be tracked individually.
The top-level LB policy, which is an aggregator for CDS policies. It maintains the lifecycle of CDS LB policy instances. The pick argument taken from the Channel contains the information to determine which child CDS policy instance should the picking operation be delegated to.
The implementation is similar to the action part of what we currently have in the routing policy. The existing routing policy will be refactored to two parts, with the route match part moved into ConfigSelector and action part being this top-level LB policy.
Continuation of #7169 to parse all resources in ADS response to v3 objects. In this PR we still only send v2 requests to xDS server (No v3 bootstrap or env flag support).
This is part of xDS v3 support as per go/grpc-xds-v3-support
In this PR:
- still only send v2 requests to xDS server (No v3 bootstrap or env flag support)
- parse Listener update as v3 proto
- Refactor SDS's Listener watcher to use enovy v3 API
- still parse other resources as v2 proto.
It has been our intention for years to remove nameResolverFactory. We should
make it clear to users to avoid new code depending on it and so they can tell
us why they need it so we can provide replacements.
De-duplicate cluster update information pushed to cluster watchers.
This only applies to CDS as the management server sends a response with all requested clusters while only some of. them have changed (or newly been subscribed).
This does not apply to EDS as the protocol is incremental and each EDS response will only contain ClusterLoadAssignments for clusters whose endpoints have changed.
This does not apply to LDS and RDS as at any time we will subscribe to a single resource and our TD implementation will not send extra (unrequested) resources. So each time, the received responses always contain updated resource information.
Create the counter for recording per locality stats upon creating the child balancer for that locality. When the locality is deactivated (due to EDS response update removes it), the counter is not deleted from the LoadStatsStore. Delete it when the child balancer for that locality is shut down. In this way, the lifecycle of the load stats counter for a certain locality stays same with the child balancer for that locality. This is exactly what will happen after we refactor LocalityStore to PriorityLoadBalancer and LrsLoadBalancer (i.e., when some priority is deactivated, its subtree is not deleted immediately, so the LrsLoadBalancer instances for localities still hold the load stats counters).
Implemented service config generation in the xDS resolver with xds_routing that supports all matchers. Reimplemented xds_routing config parsing with all matchers. Existing implementation for xds_routing LB policy is mostly deleted for now, as we would need to reimplement the route matching logic with matchers added.
Put Channel into TRANSIENT_FAILURE when CDS/EDS resource that is currently being watched becomes unavailable. CDS/EDS LB policies should shut down their downstream policy instances (stop using current Subchannels for new RPCs) and propagate TRANSIENT_FAILURE status to their parent policies (and may eventually to the Channel).
Changed the logic of parsing Route to skip Routes with action that specifies cluster_header. Eliminate unnecessary validation logic in XdsClientImpl, of which is already covered in converters.
sanjaypujare
ZHANG Dapeng
Ran
Chengyuan Zhang
ZhenLian
cindyxue
Eric Anderson
Jihun Cho
Elliotte Rusty Harold