Release v1.60.0 · grpc/grpc-java

api: Stabilize ForwardingServerBuilder, ForwardingChannelBuilder2, and ForwardingChannelBuilder. Note that ForwardingChannelBuilder is stabilized (no changes will be made to it), but immediately deprecated in favor of ForwardingChannelBuilder2. (#10586)
api: Deprecate ForwardingChannelBuilder.delegate(). De facto this deprecates the class itself, since all classes extending ForwardingChannelBuilder implement the delegate() method. See javadoc for details (#10587)
api: Changed recently-introduced LoadBalancer.acceptResolvedAddresses() to return Status instead of boolean (#10636). This is part of continued work to align the LB API cross-language and API stabilization
stub: Deprecate StreamObservers (#10654)
alts: AltsChannelBuilder now extends ForwardingChannelBuilder2 (#10587)
protobuf: Stabilize ProtoUtils.metadataMarshaller() (#10628)
protobuf-lite: ProtoLiteUtils experimental comment (#10627)

core: ManagedChannels now check the address types provided by the nameResolver (for the given target) with the address types supported by the channel transport and generate an error in case of mismatch. That dramatically improves the error message when an issue occurs
core: When a server stream is closed due to user's code (an uncaught exception in halfClosed, messagesAvailable, onReady callback of a ServerStream's listener), the Status.UNKNOWN returned to the client will have Application error processing RPC description. Previously the description was empty. This is helpful to differentiate between server errors originated in user application, gRPC library, or even those injected by a proxy. (#10643)
xds: Log ORCA UNIMPLEMENTED error to subchannel logger. This removes them from the normal application logs, reducing log spam

Change the underlying implementations of RingHash, RoundRobin, WeightedRoundRobin and LeastRequest load balancers to utilize the pick first load balancer rather than directly manage subchannels. This should only be noticeable if it introduced a bug
core: Avoid flushing headers when the server returns a single response (#9314). This is a performance optimization to reduce the number of packets for non-streaming responses
util: Make grpc-core an implementation dependency. This will prevent the io.grpc.internal classes in grpc-core from being visible during compilation when depending on just grpc-util
netty: Implement Http2Headers.isEmpty(). This fixes compatibility with Netty 4.1.101.Final.
netty: Add NettyServerBuilder.maxRstFramesPerWindow(). This can be used to limit impact of Rapid Reset
netty: Disable huffman coding in headers (#10563). Huffman coding provides modest compression for relatively high CPU usage, especially within a data center. Rely just on the HPACK static and dynamic tables for compression, for higher performance. This only impacts header values 512 bytes or longer, as Netty already disabled Huffman for smaller values
alts: Improve handshake failure error message by propagating original exception (#10644)

util: Remove shutdown subchannels from OD tracking (#10683). This could have caused a memory leak on a long-lived channel. But we don’t think it could be triggered with our built-in load balancing policies.

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