Sylvain Lebresne created CASSANDRA-13813:
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Summary: 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
Reporter: Sylvain Lebresne
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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