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https://issues.apache.org/jira/browse/HIVE-21693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Miklos Gergely reassigned HIVE-21693:
-------------------------------------


> Break up DDLTask - extract Process related operations
> -----------------------------------------------------
>
>                 Key: HIVE-21693
>                 URL: https://issues.apache.org/jira/browse/HIVE-21693
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Hive
>    Affects Versions: 3.1.1
>            Reporter: Miklos Gergely
>            Assignee: Miklos Gergely
>            Priority: Major
>              Labels: refactor-ddl
>             Fix For: 4.0.0
>
>
> DDLTask is a huge class, more than 5000 lines long. The related DDLWork is 
> also a huge class, which has a field for each DDL operation it supports. The 
> goal is to refactor these in order to have everything cut into more 
> handleable classes under the package  org.apache.hadoop.hive.ql.exec.ddl:
>  * have a separate class for each operation
>  * have a package for each operation group (database ddl, table ddl, etc), so 
> the amount of classes under a package is more manageable
>  * make all the requests (DDLDesc subclasses) immutable
>  * DDLTask should be agnostic to the actual operations
>  * right now let's ignore the issue of having some operations handled by 
> DDLTask which are not actual DDL operations (lock, unlock, desc...)
> In the interim time when there are two DDLTask and DDLWork classes in the 
> code base the new ones in the new package are called DDLTask2 and DDLWork2 
> thus avoiding the usage of fully qualified class names where both the old and 
> the new classes are in use.
> Step #6: extract all the workload management related operations from the old 
> DDLTask, and move them under the new package.



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