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https://issues.apache.org/jira/browse/CASSANDRA-21210?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rishabh Saraswat updated CASSANDRA-21210:
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Parent: (was: CASSANDRA-21191)
Issue Type: New Feature (was: Sub-task)
> CEP-59: Add GRACEFUL_DISCONNECT support to Java driver
> ------------------------------------------------------
>
> Key: CASSANDRA-21210
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21210
> Project: Apache Cassandra
> Issue Type: New Feature
> Reporter: Rishabh Saraswat
> Assignee: Rishabh Saraswat
> Priority: Normal
>
> Adds GRACEFUL_DISCONNECT support to the Java 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
> Since the driver already maintains connections to all nodes, no
> reconnection is needed — requests are simply routed to already-connected
> healthy nodes.
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