Rishabh Saraswat created CASSANDRA-21284:
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Summary: CEP-59: Add GRACEFUL_DISCONNECT support to GO driver
Key: CASSANDRA-21284
URL: https://issues.apache.org/jira/browse/CASSANDRA-21284
Project: Apache Cassandra
Issue Type: Improvement
Reporter: Rishabh Saraswat
See [CEP-59
|https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=406619103]
See Server side
Adds GRACEFUL_DISCONNECT support to the GO driver. The driver now detects
server-side graceful disconnect support and subscribes to the event on all
connections, allowing it to react gracefully when a node is shutting down.
Flow:
1. Driver sends OPTIONS to server
2. If SUPPORTED response contains GRACEFUL_DISCONNECT: ["true"], driver
adds GRACEFUL_DISCONNECT to event types before sending REGISTER
3. REGISTER is sent to server subscribing to GRACEFUL_DISCONNECT event.
4. Upon receiving GRACEFUL_DISCONNECT event on a connection, driver marks
that node as down in the load balancing policy so new requests are
routed to other healthy nodes
5. In-flight requests on the draining connection complete normally
6. Driver closes the connection once all in-flight requests are done
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