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https://issues.apache.org/jira/browse/CASSANDRA-21001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18038944#comment-18038944
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Sam Tunnicliffe commented on CASSANDRA-21001:
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The CI results are not pretty, but all of failures are either preexisting, due
to some environmental issue with our CI system (e.g. nodetool stderr includes
{{JAVA_TOOL_OPTIONS}}), or cannot be reproduced locally.
> 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
> Priority: Normal
> Fix For: 6.x
>
> Attachments: ci_summary.html, result_details.tar.gz
>
>
> 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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