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From "Zhong Yanghong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KYLIN-3491) Improve the cube building process when using global dictionary
Date Wed, 15 Aug 2018 08:47:00 GMT

    [ https://issues.apache.org/jira/browse/KYLIN-3491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16580846#comment-16580846
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Zhong Yanghong commented on KYLIN-3491:
---------------------------------------

The shrunken dictionaries are temporary dicts. They are extracted from the global dictionary.
After the encoding of raw values, they are useless and will be deleted.

> Improve the cube building process when using global dictionary
> --------------------------------------------------------------
>
>                 Key: KYLIN-3491
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3491
>             Project: Kylin
>          Issue Type: Improvement
>            Reporter: Zhong Yanghong
>            Assignee: Zhong Yanghong
>            Priority: Major
>
> By current cubing process, if the global dictionary is very large, since the raw data
records are unsorted, it's hard to encode raw values into ids for the input of bitmap due
to frequent swap of the dictionary slices. We need a refined process. The idea is as follows:
>  # for each source data block, there will be a mapper generating the distinct values
& sort them
>  # encode the sorted distinct values and generate a shrunken dict for each source data
block.
>  # when building base cuboid, use the shrunken dict for each source data block for encoding.



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