This is Maxwell's daemon, a change data capture application that reads MySQL binlogs and writes data changes as JSON to Kafka, Kinesis, and other streaming platforms.

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What's it for?

• ETL of all sorts
• maintaining an audit log of all changes to your database
• cache building/expiring
• search indexing
• inter-service communication

It goes like this:

 mysql> update `test`.`maxwell` set mycol = 55, daemon = 'Stanislaw Lem';
 maxwell -> kafka: 
 {
 "database": "test",
 "table": "maxwell",
 "type": "update",
 "ts": 1449786310,
 "data": { "id":1, "daemon": "Stanislaw Lem", "mycol": 55 },
 "old": { "mycol":, 23, "daemon": "what once was" }
 }