Sam Tunnicliffe created CASSANDRA-21001:
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Summary: Don't submit AlterSchemaStatements which produce no
effect locally to the CMS
Key: CASSANDRA-21001
URL: https://issues.apache.org/jira/browse/CASSANDRA-21001
Project: Apache Cassandra
Issue Type: Improvement
Components: Transactional Cluster Metadata
Reporter: Sam Tunnicliffe
Assignee: Sam Tunnicliffe
If a DDL statement produces no effect when the coordinator performs the
pre-submission application of the schema transformation, we can skip sending it
to the CMS and return a Void response.
The initial implementation would submit any {{AlterSchemaStatement}} which did
not generate an error but this can lead to many DDL operations which are in
fact no-ops being committed to the log. One example would be a client
application which performs a series of DDL statements with {{IF NOT EXISTS}}
clauses whenever it starts up. This is strictly correct, as the operations will
all be no-op'd when applied by the nodes in the cluster, but is somewhat
wasteful and not intuitive.
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