[jira] [Assigned] (HIVE-21292) Break up DDLTask - extract Database related operations

["Miklos Gergely (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-21292?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Miklos Gergely reassigned HIVE-21292:
-------------------------------------


> Break up DDLTask - extract Database related operations
> ------------------------------------------------------
>
>                 Key: HIVE-21292
>                 URL: https://issues.apache.org/jira/browse/HIVE-21292
>             Project: Hive
>          Issue Type: Improvement
>          Components: Hive
>    Affects Versions: 3.1.1
>            Reporter: Miklos Gergely
>            Assignee: Miklos Gergely
>            Priority: Major
>             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...)
> Step #1: extract all the database related operations from the old DDLTask, and move them under the new package. Also create the new internal framework.



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