[AMBARI-1460] Optimize query call for retrieving host information

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.2.0
• Fix Version/s: 1.2.2
• Component/s: ambari-web
• Assignee: Yusaku Sako
• Reporter: Yusaku Sako
• Created: 21/Feb/13 01:37
• Updated: 28/Feb/13 21:17
• Resolved: 22/Feb/13 07:59

Description

Every 15 seconds, Ambari Web makes a call to retrieve information about all hosts in the cluster. With 400+ nodes, this call retrieves about 10MB of info, since the API returns last_agent_env, which is host check results used during bootstrap and makes the payload huge.
By optimizing the query string for this API call, we can cut down on the payload by more than 90%.