[GOBBLIN-234] Add a ControlMessageInjector that generates metadata update control messages

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.12.0
• Sprint: Apache Gobblin 170905
• Assignee: Hung Tran
• Reporter: Hung Tran
• Created: 31/Aug/17 17:39
• Updated: 03/Jan/18 06:45
• Resolved: 20/Sep/17 21:25

Description

Some converters use the latest registered schema at the time of converter initialization. This schema may change and the converter chain may need to be updated. A control message can be used to update the converters and notify writers of schema changes.