[KAFKA-14773] Make MirrorMaker startup synchronous

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: mirrormaker
• Labels: mirror-maker
• Assignee: Unassigned
• Reporter: Divij Vaidya
• Created: 01/Mar/23 14:30
• Updated: 14/Feb/24 19:38

Description

Currently, MirrorMaker is started using `
./bin/connect-mirror-maker.sh mm2.properties` shell command. However, even if the shell command has exited and a log with `Kafka MirrorMaker started` has been printed, it is likely that the underlying connectors and tasks have not been configured.

This tasks aims to make the MirrorMaker startup synchronous by either waiting for connections & tasks to move to running state before exiting the `MirrorMaker#start()` function or by blocking completion of `main()`.

A conversation about this was done in https://github.com/apache/kafka/pull/13284