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https://issues.apache.org/jira/browse/KYLIN-2386?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dayue Gao resolved KYLIN-2386.
------------------------------
Resolution: Fixed
Fix Version/s: v2.0.0
commit
https://github.com/apache/kylin/commit/4b977215186281908a8c29741128242146a2b934
> Revert KYLIN-2349 and KYLIN-2353
> --------------------------------
>
> Key: KYLIN-2386
> URL: https://issues.apache.org/jira/browse/KYLIN-2386
> Project: Kylin
> Issue Type: Task
> Components: Metadata
> Affects Versions: v2.0.0
> Reporter: Dayue Gao
> Assignee: Dayue Gao
> Fix For: v2.0.0
>
>
> In KYLIN-2349 and KYLIN-2353, we changed the storage format of BitmapCounter
> for better performance. In the new format, cardinality and serialized size
> are recorded in the header part. This enables us to retrieve those
> information without deserialize the whole data.
> However, cardinality and serialized size can be quickly calculated just from
> the header of [roaring
> format|https://github.com/RoaringBitmap/RoaringFormatSpec/]. Performance
> tests show that we could achieve the same performance gain without the format
> change. The benefits are
> * there is no need for user to rebuild existing cube to get better performance
> * there is no need for developer to maintain two formats and deal with
> compatibility issues
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