grpc-java v1.32.1 is releasend and available on Maven Central.

Note: v1.32.0 was skipped due to release process issues. The tag does exist
though and is effectively the same code as present in v1.32.1.

API Changes

   - api: Removed deprecated method ChannelBuilder.blockingExecutor() (#7242
   <https://github.com/grpc/grpc-java/pull/7242>). There should not be any
   users as it was deprecated the first release it was available and was
   renamed offloadExecutor().
   - grpclb: Make ATTR_LB_ADDRS public (#7230
   <https://github.com/grpc/grpc-java/pull/7230>). This is necessary to
   configure grpclb from a custom NameResolver

New Features

   - xds: perform header matching on concatenated multi-valued headers (
   #7215 <https://github.com/grpc/grpc-java/pull/7215>)
   - xds: add header matching special cases for hiding/exposing some gRPC
   headers (#7224 <https://github.com/grpc/grpc-java/pull/7224>). The only
   gRPC header available for header matching is “content-type”.
   - xds: support load reporting all clusters option and fix actual report
   interval measurement (#7209 <https://github.com/grpc/grpc-java/pull/7209>).
   If the LRS response enables send_all_clusters, the client side will report
   loads for all clusters it is currently using.

Bug Fixes

   - core, alts, cronet: Fix ByteBuffer covariant method usages (#7349
   <https://github.com/grpc/grpc-java/pull/7349>). When built with Java 9+,
   internal usages of ByteBuffer APIs may cause runtime breakage for dependent
   applications running with Java 8. This is fixed now.
   - core: Fixed a bug that RPC may hang when hedging is enabled with a
   throttling configuration (#7337
   <https://github.com/grpc/grpc-java/pull/7337>)
   - netty: The environment variable
GRPC_EXPERIMENTAL_AUTOFLOWCONTROL=false will
   now disable the BDP monitoring introduced in v1.30.0. This is intended to
   help diagnose a “too_many_pings” compatibility issue and will be removed
   once it is resolved. If you need to use the variable, please file an issue
   - benchmarks: Use correct classpath for scripts (the ones in the bin/
   folder of the tar/zip), fixing NoClassDefFoundErrors. The classpath was
   probably broken starting in v1.30.
   - xds: routing policy should immediately update a picker that selects
   base on updated config (#7233
   <https://github.com/grpc/grpc-java/pull/7233>)

Dependencies

   - netty: Upgrade to Netty 4.1.51 and tcnative 2.0.31
   - android, cronet: Drop support for android SDK versions older than 16 (
   #7253 <https://github.com/grpc/grpc-java/pull/7253>). The minimum
   supported Android SDK version is 16.

Acknowledgements

@susinmotion <https://github.com/susinmotion>
@trustin <https://github.com/trustin>
@wanyingd1996 <https://github.com/wanyingd1996>

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