reviewed by Yifan Cai test_and_ci all time

26c374da4f03e4a6b64e414805cd92f3eb0a36c6 | Author: Francisco Guerrero <frank.guerrero@gmail.com>
 | 2023-03-09 12:11:20-08:00

    Synchronize CQLSSTableWriter#build on the Schema.instance object
    
    In this commit the `org.apache.cassandra.io.sstable.CQLSSTableWriter#build` method synchronizes on the
    `Schema.instance` object (instead of the `CQLSSTableWriter.class`) to prevent concurrent schema operations
    to fail when the offline tools also updates the schema.
    
    For example, a table creation operation, which modifies the keyspace tables metadata, might end up
    missing the update when a concurrent call to the `CQLSSTableWriter#build` method is accessing the
    singleton Schema instance.
    
    Patch by Francisco Guerrero, reviewed by Yifan Cai, Maxwell Guo, Alex Petrov for CASSANDRA-18317.