This PR contains the following updates:

Release Notes

v1.33.1

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gRPC Java 1.33.1 Release Notes

Bug Fixes

• Fix builders ABI backward compatibility broken in v1.33.0, see #​7552
  • netty: The class io.grpc.netty.NettyServerBuilder reverted to extend internal class io.grpc.internal.AbstractServerImplBuilder
  • netty: The class io.grpc.netty.NettyChannelBuilder reverted to extend internal class io.grpc.internal.AbstractManagedChannelImplBuilder
  • okhttp: The class io.grpc.okhttp.OkhttpChannelBuilder reverted to extend internal class io.grpc.internal.AbstractManagedChannelImplBuilder
  • core: The class io.grpc.inprocess.InProcessChannelBuilder reverted to extend internal class io.grpc.internal.AbstractManagedChannelImplBuilder
  • cronet: The class io.grpc.cronet.CronetChannelBuilder reverted to extend internal class io.grpc.internal.AbstractManagedChannelImplBuilder
• api: ForwardingServerBuilder reverted until the permanent fix of the issue with ABI compatibility of delegating classes
• okhttp: exclude Internal* from javadoc
• netty: Abrupt GOAWAY should not cause INTERNAL status. It is now UNAVAILABLE. This was a regression introduced in v1.33.0. The error was in the form StatusRuntimeException: INTERNAL: http2 exception with a cause similar to Http2Exception$StreamException: Cannot create stream 222691 greater than Last-Stream-ID 222689 from GOAWAY. This was mainly observed when a C core-based gRPC server shut down.
• core: fix floating-point number formatting Locale

v1.33.0

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This release broke ABI in a non-planned way for NettyServerBuilder, NettyChannelBuilder, and similar. See #​7552. If you are impacted, please use an earlier version until v1.33.1 is available. A future ABI breakage may be necessary, but will be communicated explicitly at that time.

API Changes

• netty: The class io.grpc.netty.NettyServerBuilder is no longer a subclass of the internal class io.grpc.internal.AbstractServerImplBuilder
• netty: The class io.grpc.netty.NettyChannelBuilder is no longer a subclass of the internal class io.grpc.internal.AbstractManagedChannelImplBuilder
• okhttp: The class io.grpc.okhttp.OkhttpChannelBuilder is no longer a subclass of the internal class io.grpc.internal.AbstractManagedChannelImplBuilder
• core: The class io.grpc.inprocess.InProcessChannelBuilder is no longer a subclass of the internal class io.grpc.internal.AbstractManagedChannelImplBuilder
• cronet: The class io.grpc.cronet.CronetChannelBuilder is no longer a subclass of the internal class io.grpc.internal.AbstractManagedChannelImplBuilder
• api: Add ForwardingServerBuilder: a ServerBuilder that delegates to another builder by default
• core: Add accessor for bare method name in MethodDescriptor (#​7339)
• stub: On server-side when an RPC is cancelled, only throw StatusRuntimeException: CANCELLED from onNext() for streaming responses. Previously the exception was also thrown from onNext() for unary responses and from onComplete(), which didn’t help the server avoid unnecessary processing
• okhttp: OkHttpChannelBuilder made final and can no longer be anonymous
• api, core: delete io.grpc.LoadBalancer.loadBalancingConfig attribute (#​7440). The attribute was deprecated in v1.27.0, now it is completely deleted.

New Features

• netty: Add support for IBMJSSE2 (#​7422)

Documentation

• API documentation (Javadoc) for Server and Channel builders now correctly displays inherited methods and the class hierarchy

Bug Fixes

• grpclb: Fixed a bug that RPC might be hanging when using grpclb balancer as a child balancer in a hierarchical load balancer tree (#​7434)
• netty: TCP close during TLS handshake should be UNAVAILABLE, not UNKNOWN
• netty: BDP ping accounting should occur after flow control. This resolves an incompatibility issue introduced in v1.30.0 and could be worked around via GRPC_EXPERIMENTAL_AUTOFLOWCONTROL=false introduced later. The symptom was a GOAWAY with “too_many_pings” without an aggressive keepalive configured. The environment variable is still available, but will be removed in the future

Behavior Changes

• xds: Xds server channel credential option will be required in the xDS bootstrap file. Use {"type":"insecure"}” for plaintext (#​7396)

Dependencies

• benchmarks: Removed -javaagent jvm option in CreateStartScripts, to allow running the benchmarks without building from source
• Upgrade Conscrypt to 2.5.1
• bazel: Remove Maven repositories from repositories.bzl, in favor of maven_install. v1.27.0 introduced support for maven_install and encouraged users to migrate. See examples/WORKSPACE for an example. maven_install dramatically reduces the boilerplate for maven dependencies and properly handles transitive dependencies and version selection. gRPC is not yet using the @maven workspace, so it is still possible to use other dependency tools.
• Update protobuf gradle plugin version to 0.8.13 (#​7355)

Acknowledgements

@​codeblooded Benjamin Reed
@​kiwi1969 Russell Shaw
@​pkern Philipp Kern

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