[HIVE-12945] Bucket pruning: bucketing for -ve hashcodes have historical issues

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: Tez
• Labels: TODOC2.0
• Target Version/s: 2.0.0
• Assignee: Gopal Vijayaraghavan
• Reporter: Gopal Vijayaraghavan
• Created: 27/Jan/16 19:08
• Updated: 02/Jun/16 10:17
• Resolved: 01/Feb/16 18:39

Description

The different ETL pathways differed in reducer choice slightly for -ve hashcodes.

(hashCode & Integer.MAX_VALUE) % numberOfBuckets;
!=
Math.abs(hashCode) % numberOfBuckets

Add a backwards compat option, which can be used to protect against old data left over from 0.13.