Rewriting TiCDC in Java would provide better downstream ecosystem compatibility

[jackysp]

Connecting downstream requires integrating the client of the downstream service, such as MySQL client or Kafka client.
For example, when connecting downstream to Kafka, most customers prefer using the Keystore feature for connection. However, the Go client of Kafka does not support this; only the Java client supports it.

[flowbehappy]

There is a plan to provide a gRPC service to allow any clients to connect to TiCDC and pull events from TiCDC. So if a customer want more features related to downstream, it can customizes itself easily.