Put replica online when bgsave is done #13895
Merged
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Before #13732, replicas were brought online immediately after master wrote the last bytes of the RDB file to the socket. This behavior remains unchanged if rdbchannel replication is not used. However, with rdbchannel replication, the replica is brought online after receiving the first ack which is sent by replica after rdb is loaded.
To align the behavior, reverting this change to put replica online once bgsave is done.
Additonal changes:
mem_total_replication_bufferswill also containserver.repl_full_sync_buffer.mem_usedwhich shows accumulated replication stream during rdbchannel replication on replica side.