Currently reading and writing are all on the leader, We test the performance of 4u8g*3 dledger cluster and find out that when the CPU consumption of the leader node reaches 3.1u, the CPU consumption of the follower node is only 0.3u(1/13 cpu utilization)
You are expected to do the following:

1. Realize the ability to read from the replica node
2. In the cloud environment, the same AZ delay is tens of us level, and the cross AZ delay is more than 1ms level, realize AZ aware read
3. support async logging and dynamic modify logging level
4. implement dledger producer api inner tracing，such as localTime and replicateTime