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Implement client-side handling of the GRACEFUL_DISCONNECT event (CASSANDRA-21191 / CEP-59). When a node announces a graceful shutdown, the driver drains in-flight requests on the affected connections before closing them and fails new requests over to other nodes, instead of surfacing connection errors to the application. The capability is negotiated per connection against the server's SUPPORTED response, controlled by the Cluster graceful_disconnect_enabled option (enabled by default), and a graceful_disconnects counter is added to Metrics. Adds unit tests for capability negotiation, connection and pool draining, and control-connection handling, plus a CCM drain integration test.
…iver into CASSPYTHON-16-graceful-disconnect # Conflicts: # CHANGELOG.rst # cassandra/cluster.py # cassandra/metrics.py
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Implements client-side handling of the GRACEFUL_DISCONNECT event
(CASSANDRA-21191 / CEP-59) for the Python driver.
When a node announces a graceful shutdown, the driver drains in-flight
requests on the affected connections before closing them and fails new
requests over to other nodes, instead of surfacing connection errors to the
application.
The capability is negotiated per connection against the server's SUPPORTED
response, controlled by the Cluster graceful_disconnect_enabled option
(enabled by default), and a graceful_disconnects counter is added to Metrics.
Testing:
and control-connection handling.
JIRA: https://issues.apache.org/jira/browse/CASSPYTHON-16