Sam Tunnicliffe created CASSANDRA-21239:
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Summary: Synchronously publish changes to local gossip state
following metadata updates
Key: CASSANDRA-21239
URL: https://issues.apache.org/jira/browse/CASSANDRA-21239
Project: Apache Cassandra
Issue Type: Improvement
Components: Cluster/Gossip, Transactional Cluster Metadata
Reporter: Sam Tunnicliffe
Assignee: Sam Tunnicliffe
Executing {{LegacyStateListener}} callbacks asynchronously, using
{{ScheduledExecutors.optionalTasks}} can lead to gossip changes, specifically
for {{SCHEMA_VERSION}} being processed out of order. While this is harmless for
Cassandra internally, it can lead to inconsistencies between the schema
versions reported in the {{system.local}} table and the {{system.peers_v2}}
tables and that may be problematic for clients.
There is no compelling reason for a {{ChangeListener}} implementation to be
asynchronous , so we should just remove the {{Async}} interface.
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