Test failure: dtest.jmx_test.TestJMX.test_compactionstats

Error Message
AttributeError: 'NoneType' object has no attribute 'named'

Stacktrace
self = <jmx_test.TestJMX object at 0x7fe78cfc2940> def test_compactionstats(self): """ @jira_ticket CASSANDRA-10504 @jira_ticket CASSANDRA-10427 Test that jmx MBean used by nodetool compactionstats properly updates the progress of a compaction """ cluster = self.cluster cluster.populate(1) node = cluster.nodelist()[0] cluster.start() # Run a quick stress command to create the keyspace and table node.stress(['write', 'n=1', 'no-warmup']) # Disable compaction on the table node.nodetool('disableautocompaction keyspace1 standard1') node.nodetool('setcompactionthroughput 1') node.stress(['write', 'n=150K', 'no-warmup']) node.flush() # Run a major compaction. This will be the compaction whose # progress we track. node.nodetool_process('compact') # We need to sleep here to give compaction time to start # Why not do something smarter? Because if the bug regresses, # we can't rely on jmx to tell us that compaction started. time.sleep(5) compaction_manager = make_mbean('db', type='CompactionManager') with JolokiaAgent(node) as jmx: progress_string = jmx.read_attribute(compaction_manager, 'CompactionSummary')[0] # Pause in between reads # to allow compaction to move forward time.sleep(2) updated_progress_string = jmx.read_attribute(compaction_manager, 'CompactionSummary')[0] var = 'Compaction@{uuid}(keyspace1, standard1, {progress}/{total})bytes' if self.cluster.version() >= LooseVersion('4.0'): # CASSANDRA-15954 var = 'Compaction({taskUuid}, {progress} / {total} bytes)@{uuid}(keyspace1, standard1)' > progress = int(parse.search(var, progress_string).named['progress']) E AttributeError: 'NoneType' object has no attribute 'named' jmx_test.py:218: AttributeError