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From "Karan Mehta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4227) Row for "SYSTEM" schema is not created during ConnectionQueryServicesImpl init
Date Sat, 23 Sep 2017 08:12:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16177625#comment-16177625
] 

Karan Mehta commented on PHOENIX-4227:
--------------------------------------

This is relevant to PHOENIX-672, For example if a statement tries to apply permissions to
SYSTEM schema, it will fail because it will not be able to locate any schema with that name
through the SYSTEM.CATALOG table. 

> Row for "SYSTEM" schema is not created during ConnectionQueryServicesImpl init 
> -------------------------------------------------------------------------------
>
>                 Key: PHOENIX-4227
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4227
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.12.0
>            Reporter: Karan Mehta
>
> For every new schema created through Phoenix, a row containing the schema name (with
a 0x0 at the beginning and the end) is added to SYSTEM.CATALOG table. This is used for by
other statements such as "USE SCHEMA" or "CREATE SCHEMA" to determine if the schema exists
or not. 
> However when we turn on namespaces, SYSTEM tables are automatically migrated to SYSTEM
namespace in HBase. However an SYSTEM.CATALOG entry with the row (\x0SYSTEM\x0) is not created.
Thus other statements trying to use it might receive a SCHEMA_NOT_FOUND_EXCEPTION even though
the schema exists in the file.
> A "CREATE SCHEMA SYSTEM" statement can create the corresponding row entry in the SYSCAT
table. This JIRA is to fix this behaviour and make it consistent for all schemas across Phoenix.



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