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From "David Capwell (Jira)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-16826) Fix flaky test consistent_bootstrap_test.py::TestBootstrapConsistency::test_consistent_reads_after_move
Date Tue, 17 Aug 2021 00:44:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-16826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17400066#comment-17400066
] 

David Capwell commented on CASSANDRA-16826:
-------------------------------------------

removed myself.  If you look at the test failures in circle there are several things going
on; each may need to be looked at

> Fix flaky test consistent_bootstrap_test.py::TestBootstrapConsistency::test_consistent_reads_after_move
> -------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-16826
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16826
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Test/dtest/python
>            Reporter: David Capwell
>            Priority: Normal
>             Fix For: NA
>
>
> consistent_bootstrap_test.py::TestBootstrapConsistency::test_consistent_reads_after_move
can be flaky from time to time on less powerful environments due to timeouts; this can be
improved by having retries for queries
> Here is the error I was seeing
> {code}
> self =  <consistent_bootstrap_test.TestBootstrapConsistency object at 0x7fad988790f0>
>      @pytest.mark.no_vnodes
>     def test_consistent_reads_after_move(self):
>         logger.debug("Creating a ring")
>         cluster = self.cluster
>         cluster.set_configuration_options(values={'hinted_handoff_enabled': False,
>                                                   'write_request_timeout_in_ms': 60000,
>                                                   'read_request_timeout_in_ms': 60000,
>                                                   'dynamic_snitch_badness_threshold':
0.0})
>         cluster.set_batch_commitlog(enabled=True)
>    
>         cluster.populate(3, tokens=[0, 2**48, 2**62]).start()
>         node1, node2, node3 = cluster.nodelist()
>    
>         logger.debug("Set to talk to node 2")
>         n2session = self.patient_cql_connection(node2)
>         create_ks(n2session, 'ks', 2)
>         create_c1c2_table(self, n2session)
>    
>         logger.debug("Generating some data for all nodes")
>         insert_c1c2(n2session, keys=list(range(10, 20)), consistency=ConsistencyLevel.ALL)
>    
>         node1.flush()
>         logger.debug("Taking down node1")
>         node1.stop(wait_other_notice=True)
>    
>         logger.debug("Writing data to node2")
>         insert_c1c2(n2session, keys=list(range(30, 1000)), consistency=ConsistencyLevel.ONE)
>         node2.flush()
>    
>         logger.debug("Restart node1")
>         node1.start()
>    
>         logger.debug("Move token on node3")
>         node3.move(2)
>    
>         logger.debug("Checking that no data was lost")
>         for n in range(10, 20):
>             query_c1c2(n2session, n, ConsistencyLevel.ALL)
>    
>         for n in range(30, 1000):
> >            query_c1c2(n2session, n, ConsistencyLevel.ALL)
>  consistent_bootstrap_test.py:55: 
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
> tools/data.py:34: in query_c1c2
>     rows = list(session.execute(query))
> cassandra/cluster.py:2618: in cassandra.cluster.Session.execute
>     ???
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
>  >    ???
> E   cassandra.OperationTimedOut: errors={'127.0.0.1:9042': 'Client request timeout. See
Session.execute[_async](timeout)'}, last_host=127.0.0.1:9042
>  cassandra/cluster.py:4894: OperationTimedOut
> {code}



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