Rishabh Saraswat created CASSGO-116:
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Summary: CEP-59: Add GRACEFUL_DISCONNECT support to JS driver
Key: CASSGO-116
URL: https://issues.apache.org/jira/browse/CASSGO-116
Project: Apache Cassandra Go driver
Issue Type: Improvement
Reporter: Rishabh Saraswat
See [CEP-59
|https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=406619103]
See [Server side |https://issues.apache.org/jira/browse/CASSANDRA-21191]
Adds GRACEFUL_DISCONNECT support to the JS 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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