frankgh opened a new pull request, #2207:
URL: https://github.com/apache/cassandra/pull/2207
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.
[CASSANDRA-18317](https://issues.apache.org/jira/browse/CASSANDRA-18317)
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