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https://issues.apache.org/jira/browse/CASSANDRA-18947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17790985#comment-17790985
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Sam Tunnicliffe commented on CASSANDRA-18947:
---------------------------------------------
This is the error reported in CASSANDRA-19092 which has a patch available and
for which CI is currently running.
The issue is an overzealous error from the failure detector and is quite
harmless. As you can see from the output, there is no problem stopping the node
or otherwise running the test (it reports {{PASSED}}) but the unexpected
logging causes the failure.
> Test failure:
> dtest-novnode.disk_balance_test.TestDiskBalance.test_disk_balance_stress
> --------------------------------------------------------------------------------------
>
> Key: CASSANDRA-18947
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18947
> Project: Cassandra
> Issue Type: Bug
> Components: Test/dtest/python
> Reporter: Ekaterina Dimitrova
> Assignee: Berenguer Blasi
> Priority: Normal
> Fix For: 5.0-rc
>
>
> Seen here:
> https://ci-cassandra.apache.org/job/Cassandra-5.0/72/testReport/dtest-novnode.disk_balance_test/TestDiskBalance/test_disk_balance_stress/
> h3.
> {code:java}
> Error Message
> AssertionError: values not within 10.00% of the max: (2534183, 2762123,
> 2423706) (node1)
> Stacktrace
> self = <disk_balance_test.TestDiskBalance object at 0x7f8fae9b7590> def
> test_disk_balance_stress(self): cluster = self.cluster if
> self.dtest_config.use_vnodes:
> cluster.set_configuration_options(values={'num_tokens': 256})
> cluster.populate(4).start() node1 = cluster.nodes['node1']
> node1.stress(['write', 'n=50k', 'no-warmup', '-rate', 'threads=100',
> '-schema', 'replication(factor=3)',
> 'compaction(strategy=SizeTieredCompactionStrategy,enabled=false)'])
> cluster.flush() # make sure the data directories are balanced: for node in
> cluster.nodelist(): > self.assert_balanced(node) disk_balance_test.py:48: _ _
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> disk_balance_test.py:186: in assert_balanced assert_almost_equal(*new_sums,
> error=0.1, error_message=node.name) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ args = (2534183, 2762123, 2423706)
> kwargs = {'error': 0.1, 'error_message': 'node1'}, error = 0.1, vmax =
> 2762123 vmin = 2423706, error_message = 'node1' def
> assert_almost_equal(*args, **kwargs): """ Assert variable number of arguments
> all fall within a margin of error. @params *args variable number of numerical
> arguments to check @params error Optional margin of error. Default 0.16
> @params error_message Optional error message to print. Default '' Examples:
> assert_almost_equal(sizes[2], init_size) assert_almost_equal(ttl_session1,
> ttl_session2[0][0], error=0.005) """ error = kwargs['error'] if 'error' in
> kwargs else 0.16 vmax = max(args) vmin = min(args) error_message = '' if
> 'error_message' not in kwargs else kwargs['error_message'] assert vmin > vmax
> * (1.0 - error) or vmin == vmax, \ > "values not within {:.2f}% of the max:
> {} ({})".format(error * 100, args, error_message) E AssertionError: values
> not within 10.00% of the max: (2534183, 2762123, 2423706) (node1)
> tools/assertions.py:206: AssertionError
> {code}
>
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