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#!/usr/bin/env python
#
# Public Domain 2014-2020 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
def timestamp_str(t):
return '%x' % t
# test_prepare09.py
# Validate scenarios involving inserting tombstones when rolling back prepares
class test_prepare09(wttest.WiredTigerTestCase):
conn_config = 'cache_size=2MB,statistics=(all)'
session_config = 'isolation=snapshot'
def test_prepared_update_is_aborted_correctly_with_on_disk_value(self):
uri = "table:test_prepare09"
create_params = 'value_format=S,key_format=i'
value1 = 'a' * 10000
value2 = 'b' * 10000
value3 = 'c' * 10000
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1) +
',stable_timestamp=' + timestamp_str(1))
self.session.create(uri, create_params)
cursor = self.session.open_cursor(uri)
session2 = self.setUpSessionOpen(self.conn)
cursor2 = session2.open_cursor(uri)
# Insert a new value.
self.session.begin_transaction()
cursor[1] = value1
self.session.commit_transaction('commit_timestamp=' + timestamp_str(2))
# Get the previous update onto disk.
for i in range(2, 10000):
cursor2[i] = value2
cursor2.reset()
# Prepare a full value and roll it back.
self.session.begin_transaction()
cursor[1] = value3
self.assertEqual(self.session.prepare_transaction('prepare_timestamp=' + timestamp_str(3)), 0)
self.session.rollback_transaction()
# Do a search, if we've aborted the update correct we won't have inserted a tombstone
# and the original value will be visible to us.
cursor.set_key(1)
self.assertEquals(cursor.search(), 0)
self.assertEquals(cursor.get_value(), value1)
def test_prepared_update_is_aborted_correctly(self):
uri = "table:test_prepare09"
create_params = 'value_format=S,key_format=i'
value1 = 'a' * 10000
value2 = 'b' * 10000
value3 = 'e' * 10000
value4 = 'd' * 10000
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1) +
',stable_timestamp=' + timestamp_str(1))
self.session.create(uri, create_params)
cursor = self.session.open_cursor(uri)
session2 = self.setUpSessionOpen(self.conn)
cursor2 = session2.open_cursor(uri)
# Prepare a full value.
self.session.begin_transaction()
cursor[1] = value1
cursor[2] = value2
cursor[3] = value3
self.assertEqual(self.session.prepare_transaction('prepare_timestamp=' + timestamp_str(3)), 0)
# Get the prepare onto disk.
for i in range(4, 10000):
cursor2[i] = value4
cursor2.reset()
# Rollback the prepare.
self.assertEqual(self.session.rollback_transaction(), 0)
# Search for key one, we should get not found.
cursor.set_key(1)
self.assertEqual(cursor.search(), wiredtiger.WT_NOTFOUND)
if __name__ == '__main__':
wttest.run()
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