server: prohibit more than MaxConcurrentStreams handlers from running at once (CVE-2023-44487)
In addition to this change, applications should ensure they do not leave running tasks behind related to the RPC before returning from method handlers, or should enforce appropriate limits on any such work.
balancer/weighted_round_robin: fix ticker leak on update
A new ticker is created every time there is an update of addresses or configuration, but was not properly stopped. This change stops the ticker when it is no longer needed.
This was previously used as a signal to enable the "grpclb" load balancing policy, and to pass LB addresses to the policy. Instead, balancer/grpclb/state.Set() should be used to add these addresses to the name resolver's output. The built-in "dns" name resolver already does this.
resolver: add new field Endpoints to State and deprecate Addresses (#6471)
Addresses will be deleted in the future.
New Features
balancer/leastrequest: Add experimental support for least request LB policy and least request configured as a custom xDS policy (#6510, #6517)
Set GRPC_EXPERIMENTAL_ENABLE_LEAST_REQUEST=true to enable
stats: Add an RPC event for blocking caused by the LB policy's picker (#6422)
Bug Fixes
clusterresolver: fix deadlock when dns resolver responds inline with update or error at build time (#6563)
grpc: fix a bug where the channel could erroneously report TRANSIENT_FAILURE when actually moving to IDLE (#6497)
balancergroup: do not cache closed sub-balancers by default; affects rls, weightedtarget and clustermanager LB policies (#6523)
client: fix a bug that prevented detection of RPC status in trailers-only RPC responses when using ClientStream.Header(), and prevented retry of the RPC (#6557)
Performance Improvements
client & server: Add experimental [With]SharedWriteBuffer to improve performance by reducing allocations when sending RPC messages. (Disabled by default.) (#6309)
server: prohibit more than MaxConcurrentStreams handlers from running at once (CVE-2023-44487)
In addition to this change, applications should ensure they do not leave running tasks behind related to the RPC before returning from method handlers, or should enforce appropriate limits on any such work.
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