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https://issues.apache.org/jira/browse/KYLIN-3491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592327#comment-16592327
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ASF subversion and git services commented on KYLIN-3491:
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Commit 637f45d8444c7b52713780c1701d33d6656fffc0 in kylin's branch
refs/heads/master from Zhong
[ https://gitbox.apache.org/repos/asf?p=kylin.git;h=637f45d ]
KYLIN-3491 add a shrunken global dictionary step to improve the encoding process
Signed-off-by: shaofengshi <shaofeng...@apache.org>
> 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
> Components: Job Engine
> Reporter: Zhong Yanghong
> Assignee: Zhong Yanghong
> Priority: Major
> Fix For: v2.5.0
>
> Attachments: APACHE-KYLIN-3491.patch
>
>
> 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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