[HADOOP-8304] DNSToSwitchMapping should add interface to resolve individual host besides a list of host

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 1.0.0, 2.0.0-alpha
• Fix Version/s: 2.0.0-alpha
• Component/s: io
• Target Version/s: 2.0.0-alpha
• Assignee: Junping Du
• Reporter: Junping Du
• Due: 30/Apr/12
• Created: 23/Apr/12 10:35
• Updated: 23/May/12 20:15
• Resolved: 08/May/12 21:14

Description

DNSToSwitchMapping now has only one API to resolve a host list: public List<String> resolve(List<String> names). But the two major caller: RackResolver.resolve() and DatanodeManager.resolveNetworkLocation() are taking single host name but have to wrapper it to an single entry ArrayList. This is not necessary especially the host has been cached before.