From MySQL 8.0.18, you can optionally configure compression for distributed recovery by the method of state transfer from a donor's binary log. Compression can benefit distributed recovery where network bandwidth is limited and the donor has to transfer many transactions to the joining member. The group_replication_recovery_compression_algorithms and group_replication_recovery_zstd_compression_level system variables configure permitted compression algorithms, and the zstd compression level, used when carrying out state transfer from a donor's binary log. For more information, see Section 4.2.8, “Connection Compression Control”.

Note that these compression settings do not apply for remote cloning operations. When a remote cloning operation is used for distributed recovery, the clone plugin's clone_enable_compression setting applies.