[KAFKA-14314] MirrorSourceConnector throwing NPE during `isCycle` check

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 3.3.1
• Fix Version/s: 3.4.0
• Component/s: mirrormaker
• Assignee: John Krupka
• Reporter: John Krupka
• Created: 18/Oct/22 11:20
• Updated: 28/Oct/22 15:28
• Resolved: 28/Oct/22 15:28

Description

We are using MirrorMaker to replicate topics across clusters in AWS. As the process is starting up, we are getting a NullPointerException when MirrorSourceConnector is calling `isCycle`.

Retrieving the `upstreamTopic` on this line of code is returning null, which causes the NPE on the next line. 

Issue Links

• links to: GitHub Pull Request #12769