Major - P3 A recent Evergreen build on Windows variant, an assertion failure occurred in test_schema06.test_index_stress, detecting unexpected statistics value for session level schema lock wait.
[2018/12/06 15:32:30.035] FAIL: test_schema06.test_schema06.test_index_stress -s 1 (lsm) [2018/12/06 15:32:30.035] ---------------------------------------------------------------------- [2018/12/06 15:32:30.035] Traceback (most recent call last): [2018/12/06 15:32:30.035] File "C:\data\mci\300ac2a4d2673480bf34a312429edb7e\wiredtiger\test\suite\test_schema06.py", line 105, in test_index_stress [2018/12/06 15:32:30.035] self.assertTrue(stat_value > 0) [2018/12/06 15:32:30.035] AssertionError: False is not true
The assertion failed with an expected stat_value in below code context:
95 # Test the session level schema lock wait statistic. The schema lock
96 # wait is seen for the lsm table only. Concurrent lsm worker threads
97 # could require an in-memory chunk switch under a schema lock.
98 if self.idx_config == ',type=lsm':
99 found = False
100 stat_cur = self.session.open_cursor('statistics:session', None, None)
101 while stat_cur.next() == 0:
102 [desc, pvalue, stat_value] = stat_cur.get_values()
103 if desc == 'session: schema lock wait time (usecs)':
104 found = True
105 self.assertTrue(stat_value > 0)
106 self.assertEqual(found, True)