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From "Russ Hatch (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11539) dtest failure in topology_test.TestTopology.movement_test
Date Fri, 22 Apr 2016 23:26:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15254888#comment-15254888
] 

Russ Hatch commented on CASSANDRA-11539:
----------------------------------------

Change I tried above above got the failure rate down to 1/100. Bumping up the dataset by another
10k rows to see if that can get to zero. Bulk run here: http://cassci.datastax.com/view/Parameterized/job/parameterized_dtest_multiplexer/83/

> dtest failure in topology_test.TestTopology.movement_test
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-11539
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11539
>             Project: Cassandra
>          Issue Type: Test
>          Components: Testing
>            Reporter: Michael Shuler
>            Assignee: Russ Hatch
>              Labels: dtest
>             Fix For: 3.x
>
>
> example failure:
> {noformat}
> Error Message
> values not within 16.00% of the max: (335.88, 404.31) ()
> -------------------- >> begin captured logging << --------------------
> dtest: DEBUG: cluster ccm directory: /mnt/tmp/dtest-XGOyDd
> dtest: DEBUG: Custom init_config not found. Setting defaults.
> dtest: DEBUG: Done setting configuration options:
> {   'num_tokens': None,
>     'phi_convict_threshold': 5,
>     'range_request_timeout_in_ms': 10000,
>     'read_request_timeout_in_ms': 10000,
>     'request_timeout_in_ms': 10000,
>     'truncate_request_timeout_in_ms': 10000,
>     'write_request_timeout_in_ms': 10000}
> --------------------- >> end captured logging << ---------------------
> Stacktrace
>   File "/usr/lib/python2.7/unittest/case.py", line 329, in run
>     testMethod()
>   File "/home/automaton/cassandra-dtest/topology_test.py", line 93, in movement_test
>     assert_almost_equal(sizes[1], sizes[2])
>   File "/home/automaton/cassandra-dtest/assertions.py", line 75, in assert_almost_equal
>     assert vmin > vmax * (1.0 - error) or vmin == vmax, "values not within %.2f%%
of the max: %s (%s)" % (error * 100, args, error_message)
> "values not within 16.00% of the max: (335.88, 404.31) ()\n-------------------- >>
begin captured logging << --------------------\ndtest: DEBUG: cluster ccm directory:
/mnt/tmp/dtest-XGOyDd\ndtest: DEBUG: Custom init_config not found. Setting defaults.\ndtest:
DEBUG: Done setting configuration options:\n{   'num_tokens': None,\n    'phi_convict_threshold':
5,\n    'range_request_timeout_in_ms': 10000,\n    'read_request_timeout_in_ms': 10000,\n
   'request_timeout_in_ms': 10000,\n    'truncate_request_timeout_in_ms': 10000,\n    'write_request_timeout_in_ms':
10000}\n--------------------- >> end captured logging << ---------------------"
> {noformat}
> http://cassci.datastax.com/job/cassandra-3.5_novnode_dtest/22/testReport/topology_test/TestTopology/movement_test
> ----
> I dug through this test's history on the trunk, 3.5, 3.0, and 2.2 branches. It appears
this test is stable and passing on 3.0 & 2.2 (which could be just luck). On trunk &
3.5, however, this test has flapped a small number of times.
> The test's threshold is 16% and I found test failures in the 3.5 branch of 16.2%, 16.9%,
and 18.3%. In trunk I found 17.4% and 23.5% diff failures.



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