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Posted to issues@kylin.apache.org by "hongbin ma (JIRA)" <ji...@apache.org> on 2016/11/22 08:58:59 UTC

[jira] [Resolved] (KYLIN-2198) Add a framework to allow major changes in DimensionEncoding

     [ https://issues.apache.org/jira/browse/KYLIN-2198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

hongbin ma resolved KYLIN-2198.
-------------------------------
       Resolution: Fixed
    Fix Version/s: v1.6.1

> Add a framework to allow major changes in DimensionEncoding
> -----------------------------------------------------------
>
>                 Key: KYLIN-2198
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2198
>             Project: Kylin
>          Issue Type: Improvement
>            Reporter: hongbin ma
>            Assignee: hongbin ma
>             Fix For: v1.6.1
>
>
> Recently a fatal error is found in one of the DimensionEncoding called IntegerDimEnc(KYLIN-2191). The bug fix will cause cube content differs after applying the bug fix. Such result will confuse users.
> Since major changes on DimensionEncoding is always possible, either due to optimization purpose or bug fix purpose. A framework that takes into consideration of "DimensionEncoding version" is necessary. By default all DimensionEncoding has version number 1. Whenever a major change is applied on a DimensionEncoding subclass (for example IntegerDimEnc), instead of applying the change directly on the DimensionEncoding subclass (for example IntegerDimEnc), we fork a new subclass of DimensionEncoding (for example IntegerDimEncV2), which increases the original class's version number. The "encode name" remains same(for example "integer")
> After a DimensionEncoding with newer version is published in a new Kylin release, legacy cubes can still use the older DimensionEncoding. However they have take the risky of using the old DimensionEncoding.
> The web GUI will only prompt users with the latest version of DimensionEncodings. For legacy cubes, a label of "deprecated" will be shown for out-dated DimensionEncodings.



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