[jira] [Closed] (PHOENIX-3534) Support multi region SYSTEM.CATALOG table

["Chinmay Kulkarni (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PHOENIX-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chinmay Kulkarni closed PHOENIX-3534.
-------------------------------------

Bulk closing Jiras for the 4.15.0 release.

> Support multi region SYSTEM.CATALOG table
> -----------------------------------------
>
>                 Key: PHOENIX-3534
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3534
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: James R. Taylor
>            Assignee: Thomas D'Silva
>            Priority: Major
>             Fix For: 4.15.0, 5.1.0
>
>         Attachments: PHOENIX-3534-v2.patch, PHOENIX-3534-v3.patch, PHOENIX-3534.patch
>
>
> Currently Phoenix requires that the SYSTEM.CATALOG table is single region based on the server-side row locks being held for operations that impact a table and all of it's views. For example, adding/removing a column from a base table pushes this change to all views.
> As an alternative to making the SYSTEM.CATALOG transactional (PHOENIX-2431), when a new table is created we can do a lazy cleanup  of any rows that may be left over from a failed DDL call (kudos to [~lhofhansl] for coming up with this idea). To implement this efficiently, we'd need to also do PHOENIX-2051 so that we can efficiently find derived views.
> The implementation would rely on an optimistic concurrency model based on checking our sequence numbers for each table/view before/after updating. Each table/view row would be individually locked for their change (metadata for a view or table cannot span regions due to our split policy), with the sequence number being incremented under lock and then returned to the client.



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