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