[YARN-538] RM address DNS lookup can cause unnecessary slowness on every JHS page load

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.3-alpha
• Fix Version/s: 2.1.0-beta
• Hadoop Flags: Reviewed
• Assignee: Sandy Ryza
• Reporter: Sandy Ryza
• Created: 28/Mar/13 02:29
• Updated: 27/Aug/13 22:15
• Resolved: 03/Apr/13 20:44

Description

When I run the job history server locally, every page load takes in the 10s of seconds. I profiled the process and discovered that all the extra time was spent inside YarnConfiguration#getRMWebAppURL, trying to resolve 0.0.0.0 to a hostname. When I changed my yarn.resourcemanager.address to localhost, the page load times decreased drastically.

There's no that we need to perform this resolution on every page load.