We saw failure in dtest concurrent_schema_changes_test.py:
TestConcurrentSchemaChanges.changes_while_node_down_test test.
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ERROR: changes_while_node_down_test (concurrent_schema_changes_test.TestConcurrentSchemaChanges)
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Traceback (most recent call last):
File "/home/asias/src/cloudius-systems/scylla-dtest/concurrent_schema_changes_test.py", line 432, in changes_while_node_down_test
self.make_schema_changes(session, namespace='ns2')
File "/home/asias/src/cloudius-systems/scylla-dtest/concurrent_schema_changes_test.py", line 86, in make_schema_changes
session.execute('USE ks_%s' % namespace)
File "cassandra/cluster.py", line 2141, in cassandra.cluster.Session.execute
return self.execute_async(query, parameters, trace, custom_payload, timeout, execution_profile, paging_state).result()
File "cassandra/cluster.py", line 4033, in cassandra.cluster.ResponseFuture.result
raise self._final_exception
ConnectionShutdown: Connection to 127.0.0.1 is closed
The test:
session = self.patient_cql_connection(node2)
self.prepare_for_changes(session, namespace='ns2')
node1.stop()
self.make_schema_changes(session, namespace='ns2') --> ConnectionShutdown exception throws
The problem is that, after receiving the DOWN event, the python
Cassandra driver will call Cluster:on_down which checks if this client
has any connections to the node being shutdown. If there is any
connections, the Cluster:on_down handler will exit early, so the session
to the node being shutdown will not be removed.
If we shutdown the cql server first, the connection count will be zero
and the session will be removed.
Fixes: #4013
Message-Id: <7388f679a7b09ada10afe7e783d7868a58aac6ec.1545634941.git.asias@scylladb.com>
4d3c463536