[AMBARI-13025] Switching config versions results in 'Restart Required' message showing up with delay

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.1.2
• Component/s: ambari-web
• Assignee: Andrii Tkach
• Reporter: Andrii Tkach
• Created: 07/Sep/15 14:11
• Updated: 07/Sep/15 19:31
• Resolved: 07/Sep/15 17:08

Description

In ZK service I had 5 different config versions and the service was all in-sync. Then I made an older version current. After like 5s the 'Restart Required' message showed up. This problem becomes worse on larger clusters - it took 20s on a 20 node cluster etc.
We need to see if UI is updating the status with such delay, or if there is a specific API that is slow to provide the updated status. If it is an API issue, please specify the exact API and turn it into a BE issue.