Corrects a bug where a deleted row was written to Kafka in the same as an insert, making them indistinguishable. Now, a deleted row is written with the row's primary/unique key as the record key, and a null record value. Note that if the row has no primary/unique key, no record is written to Kafka.
Depending upon how the source MySQL database is configured, its binlog might not contain all the history for the database. In particular, it might not have the CREATE TABLE statements for some tables, which are then "unknown" to the connector. When the connector reads the binlog and comes across a change event for a row in one of those "unknown" tables, it previously resulted in a NPE. With this change, the condition results in a warning message in the log, and all subsequent change events on that table will be skipped.
Modified the 'docs' profile to build and attach JavaDoc JARs for each module's source and test source artifacts. The profile will be automatically used when releasing.
Changed the EmbeddedConnector framework to initialize all major components via configuration properties rather than through the public builder. This increases the size of the configurations, but it simplifies what embedding applications must do to obtain an EmbeddedConnector instance.
The DatabaseHistory framework was also changed to be configurable in similar ways to the OffsetBackingStore. Essentially, connectors that want to use it (like the MySqlConnector) will describe it as part of the connector's configuration, allowing more flexibility in which DatabaseHistory implementation is used and how it is configured whether in Kafka Connector or as part of the EmbeddedConnector.
Added a README.md to `debezium-embedded` to provide documentation and sample code showing how to use the EmbeddedConnector.
