[AMBARI-25590] Ambari Get Hosts API returning empty json

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.8.0, 2.7.6
• Assignee: Andrew Onischuk
• Reporter: Andrew Onischuk
• Created: 24/Nov/20 11:43
• Updated: 24/Nov/22 08:16
• Resolved: 25/Nov/20 09:52

Description

Issue description:
When API calls in Ambari fail due to DB exceptions. Ambari re-populates caches from the DB. This causes situation that threads have different instances of ClusterImpl, so we need an equals and hashCode implemented. So that look-up in Sets/Maps/comparison worked.

How this was tested:
We were able to find a stable way to reproduce the issue by feeding an API request that produces DB exception. Once we applied the patch this was no longer reproducible.

Issue Links

• links to: GitHub PR#3265
• links to: GitHub PR#3571