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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2016/01/27 20:08:39 UTC

[jira] [Created] (HIVE-12945) Bucket pruning: bucketing for -ve hashcodes have historical issues

Gopal V created HIVE-12945:
------------------------------

             Summary: Bucket pruning: bucketing for -ve hashcodes have historical issues
                 Key: HIVE-12945
                 URL: https://issues.apache.org/jira/browse/HIVE-12945
             Project: Hive
          Issue Type: Bug
          Components: Tez
    Affects Versions: 2.0.0
            Reporter: Gopal V
            Assignee: Gopal V


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

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

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



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