[jira] [Created] (NIFI-11380) Refactor CaptureChangeMySQL with improvements

["Matt Burgess (Jira)" <ji...@apache.org>]

Matt Burgess created NIFI-11380:
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             Summary: Refactor CaptureChangeMySQL with improvements
                 Key: NIFI-11380
                 URL: https://issues.apache.org/jira/browse/NIFI-11380
             Project: Apache NiFi
          Issue Type: Improvement
            Reporter: Matt Burgess


The CaptureChangeMySQL processor can be improved in many ways:

- Eliminate use of DistributedCacheClient
- MySQLCDCUtils - delete this class. It’s unnecessary. Just put the single method that exists in the parent class of the writers

- Eliminate mutable member variables. Gather all state together into an object and store that as a single volatile member variable.
- The outputEvents method is a huge block of switch/case and if/then/else blocks. Kill all of this. Create an interface that’s capable of handling a given event type and have multiple implementations. Determine appropriate impl and call the method.
- Do not keep a bunch of member variables to “rollback local state”. Keep this in variables. If we fail, no harm, no foul. If we succeed, then update member variable.
- Remove onStopped method, just annotate stop() method with @OnStopped. No need for @OnShutdown
- Change name of “hostname” property to "node", and don’t require the port! Default to 3306.
- Remove unused hasRun member variable




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