feat: kafka connect - continuation

Author: tomaszkubacki

blog/2025-03-15-kafka-connect.md

@@ -8,16 +8,16 @@ tags: [java, kafka]
 
 # How to stream data from Kafka to relational database
 
-In this post I would like to show how to stream data from any topic to relational database.
+In this post I would like to show how to stream data from any Kafka topic to relational database with Kafka Connect.
 
 <!-- truncate -->
 
-## What is Kafka Connect
+## What is Kafka Connect ?
 
 In short Kafka Connect is a framework facilitating streaming integrations beetwen Kafka and other systems.
 You can learn more about it [here](https://developer.confluent.io/courses/kafka-connect/intro/).
 
-There are two types of Kafka Conect workflows. One is *Source* to Kafka.
+There are two types of Kafka Connect workflows. One is *Source* to Kafka.
 
 ```mermaid
     graph LR;
@@ -28,13 +28,20 @@ and the other on Kafka to *Sink*
     graph LR;
     Kafka --> kc["Kafka Connect"] --> Sink
 ```
-where *Source* and *Sink* are kind of abstractions representing any external system like MongoDb, FTP, File or any relational database like PostgreSql, Oracle or Sql Server.
-
+where *Source* and *Sink* are  abstractions representing any external system like MongoDb, FTP, File or any relational database like PostgreSql, Oracle or Sql Server or even othe kafka cluster.
 
 ## Kafka Connect Plugins
 
 
-## How it works
+## The Problem
+
+Confluent Kafka JdbcSinkConnector which I will be using requires that the incoming message schema is known to be able map between message fields and sql collumns.
+
+## The Solution
+```mermaid
+    graph LR;
+    Kafka --> conv["SimpleWrappingConverter"] --> tr["AddMetadataTransformer"] --> PostgreSQL
+```
 
 
 https://github.com/tomaszkubacki/kafka_connect_demo/blob/master/kafka_to_postgresql/kafka_to_postgres.md