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Aleksey Yeschenko commented on CASSANDRA-13813:
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Created CASSANDRA-13954 for jmx/nodetool work.
> 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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