Chris Lohfink created CASSANDRA-19578:
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Summary: Concurrent equivalent schema updates lead to unresolved
disagreement
Key: CASSANDRA-19578
URL: https://issues.apache.org/jira/browse/CASSANDRA-19578
Project: Cassandra
Issue Type: Bug
Components: Cluster/Schema
Reporter: Chris Lohfink
As part of CASSANDRA-17819 a check for empty schema changes was added to the
updateSchema. This only looks at the _logical_ schema difference of the
schemas, but the changes made to the system_schema keyspace are the ones that
actually are involved in the digest.
If two nodes issue the same CREATE statement the difference from the
keyspace.diff would be empty but the timestamps on the mutations would be
different, leading to a pseudo schema disagreement which will never resolve
until resetlocalschema or nodes being bounced.
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