[MAPREDUCE-4126] This is a fix both for oracle support and managing DB splits in general.

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.0.0
• Component/s: performance
• Labels: hadoop newbie patch

Environment

Redhat 6.1 x86_64

• Target Version/s: 1.0.0
• Assignee: Unassigned
• Reporter: Joseph Doss
• Created: 09/Apr/12 12:01
• Updated: 07/Jul/16 04:14

Description

This is and addition to an older patch that addressed oracle support. We found that in large result sets, the map reduce was both splitting the results ( as expected ) and running a duplicate ( full result set ) on one node, resulting in a long runtime that should have been reduced by splitting.