You are viewing a plain text version of this content. The canonical link for it is here.

Posted to dev@kylin.apache.org by "Shaofeng SHI (JIRA)" <ji...@apache.org> on 2016/05/11 07:07:12 UTC

[jira] [Created] (KYLIN-1677) Distribute source data by certain columns when creating flat table

Shaofeng SHI created KYLIN-1677:
-----------------------------------

             Summary: Distribute source data by certain columns when creating flat table
                 Key: KYLIN-1677
                 URL: https://issues.apache.org/jira/browse/KYLIN-1677
             Project: Kylin
          Issue Type: Improvement
          Components: Job Engine
            Reporter: Shaofeng SHI
            Assignee: Shaofeng SHI


Inspired by KYLIN-1656, Kylin can distribute the source data by certain columns when creating the flat hive table; Then the data assigned to a mapper will have more similarity, more aggregation can happen at mapper side, and then less shuffle and reduce is needed.

Columns can be used for the distribution includes: ultra high cardinality column, mandantory column, partition date/time column, etc.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)