85 lines
3.2 KiB
Python
85 lines
3.2 KiB
Python
#!/usr/bin/env python
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#
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# Public Domain 2014-2016 MongoDB, Inc.
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# Public Domain 2008-2014 WiredTiger, Inc.
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#
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# This is free and unencumbered software released into the public domain.
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#
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# Anyone is free to copy, modify, publish, use, compile, sell, or
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# distribute this software, either in source code form or as a compiled
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# binary, for any purpose, commercial or non-commercial, and by any
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# means.
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#
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# In jurisdictions that recognize copyright laws, the author or authors
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# of this software dedicate any and all copyright interest in the
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# software to the public domain. We make this dedication for the benefit
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# of the public at large and to the detriment of our heirs and
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# successors. We intend this dedication to be an overt act of
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# relinquishment in perpetuity of all present and future rights to this
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# software under copyright law.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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# OTHER DEALINGS IN THE SOFTWARE.
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import wiredtiger, wttest
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from helper import complex_populate, simple_populate
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from helper import key_populate, value_populate
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from wtscenario import check_scenarios, multiply_scenarios, number_scenarios
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# test_cursor_random02.py
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# Cursor next_random operations
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class test_cursor_random02(wttest.WiredTigerTestCase):
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type = 'table:random'
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config = [
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('not-sample', dict(config='next_random=true'))
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]
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records = [
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('1', dict(records=1)),
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('250', dict(records=250)),
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('500', dict(records=500)),
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('5000', dict(records=5000)),
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('10000', dict(records=10000)),
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('50000', dict(records=50000)),
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]
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scenarios = number_scenarios(multiply_scenarios('.', config, records))
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# Check that next_random works in the presence of a larger set of values,
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# where the values are in an insert list.
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def test_cursor_random_reasonable_distribution(self):
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uri = self.type
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num_entries = self.records
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# Set the leaf-page-max value, otherwise the page might split.
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simple_populate(self, uri,
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'leaf_page_max=100MB,key_format=S', num_entries)
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# Setup an array to track which keys are seen
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visitedKeys = [0] * (num_entries + 1)
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cursor = self.session.open_cursor(uri, None, 'next_random=true')
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for i in range(0, num_entries):
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self.assertEqual(cursor.next(), 0)
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current = cursor.get_key()
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current = int(current)
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visitedKeys[current] = visitedKeys[current] + 1
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differentKeys = sum(x > 0 for x in visitedKeys)
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#print visitedKeys
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#print differentKeys
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'''
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self.tty('differentKeys: ' + str(differentKeys) + ' of ' + \
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str(num_entries) + ', ' + \
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str((int)((differentKeys * 100) / num_entries)) + '%')
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'''
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self.assertGreater(differentKeys, num_entries / 4,
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'next_random random distribution not adequate')
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if __name__ == '__main__':
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wttest.run()
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