[HIVE-2030] isEmptyPath() to use ContentSummary cache

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.8.0
• Component/s: Query Processor
• Assignee: Siying Dong
• Reporter: Siying Dong
• Created: 08/Mar/11 01:16
• Updated: 16/Dec/11 23:57
• Resolved: 11/Mar/11 21:44

Description

addInputPaths() calls isEmptyPath() for every input path. Now every call is a DFS namenode call. Making isEmptyPath() to use cached ContentSummary, we should be able to avoid some namenode calls and reduce latency in the case of multiple partitions.