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From "Jeremiah Jordan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13813) Don't let user drop (or generally break) tables in system_distributed
Date Mon, 09 Oct 2017 13:54:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16197002#comment-16197002
] 

Jeremiah Jordan commented on CASSANDRA-13813:
---------------------------------------------

I am a little concerned about this change not letting anything be updated, but I do understand
the reasons, and I can't really see a way around them. Given that an experience person can
still get around this restriction by doing inserts into the schema tables, that is probably
enough if there are any future bugs to be worked around.  Un-experienced users should not
be changing these values by themselves.

> Don't let user drop (or generally break) tables in system_distributed
> ---------------------------------------------------------------------
>
>                 Key: CASSANDRA-13813
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13813
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Distributed Metadata
>            Reporter: Sylvain Lebresne
>            Assignee: Aleksey Yeschenko
>             Fix For: 3.0.x, 3.11.x
>
>
> There is not currently no particular restrictions on schema modifications to tables of
the {{system_distributed}} keyspace. This does mean you can drop those tables, or even alter
them in wrong ways like dropping or renaming columns. All of which is guaranteed to break
stuffs (that is, repair if you mess up with on of it's table, or MVs if you mess up with {{view_build_status}}).
> I'm pretty sure this was never intended and is an oversight of the condition on {{ALTERABLE_SYSTEM_KEYSPACES}}
in [ClientState|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/service/ClientState.java#L397].
That condition is such that any keyspace not listed in {{ALTERABLE_SYSTEM_KEYSPACES}} (which
happens to be the case for {{system_distributed}}) has no specific restrictions whatsoever,
while given the naming it's fair to assume the intention that exactly the opposite.



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