[AMBARI-9418] UI changes to resolve discrepancies between what the stack vs Ambari reports as "live" for slaves such as DataNodes and NodeManagers

• Type: Task
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: ambari-web
• Assignee: Andriy Babiichuk
• Reporter: Andriy Babiichuk
• Created: 30/Jan/15 16:44
• Updated: 02/Feb/15 22:54
• Resolved: 30/Jan/15 18:09

Description

Sometimes there are discrepancies between what the stack reports as being live vs Ambari reports as live.
This comes from the fact that liveness is tracked by the service master differently than simply process up/down, which Ambari reports.
Strictly speaking, Ambari reports both, but how UI is presenting it now creates confusion.