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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
from wtscenario import make_scenarios
from wiredtiger import stat, WT_NOTFOUND
# test_prepare_hs05.py
# Test that after aborting prepare transaction, correct update from the history store is restored.
class test_prepare_hs05(wttest.WiredTigerTestCase):
conn_config = 'cache_size=50MB'
session_config = 'isolation=snapshot'
format_values = [
('column', dict(key_format='r', key=1, value_format='S')),
('column-fix', dict(key_format='r', key=1, value_format='8t')),
('string-row', dict(key_format='S', key=str(1), value_format='S')),
]
scenarios = make_scenarios(format_values)
def test_check_prepare_abort_hs_restore(self):
uri = 'table:test_prepare_hs05'
create_params = 'key_format={},value_format={}'.format(self.key_format, self.value_format)
self.session.create(uri, create_params)
if self.value_format == '8t':
value1 = 97
value2 = 98
value3 = 99
else:
value1 = 'a' * 5
value2 = 'b' * 5
value3 = 'c' * 5
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(1))
cursor = self.session.open_cursor(uri)
key = self.key
self.session.begin_transaction()
cursor[key] = value1
cursor.set_key(key)
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(2))
# Commit update and remove operation in the same transaction.
self.session.begin_transaction()
cursor[key] = value2
cursor.set_key(key)
cursor.remove()
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(3))
# Add a prepared update for the key.
self.session.begin_transaction()
cursor[key] = value3
self.session.prepare_transaction('prepare_timestamp='+ self.timestamp_str(4))
# Try to evict the page with prepared update. This will ensure that prepared update is
# written as the on-disk version and the older versions are moved to the history store.
session2 = self.conn.open_session()
session2.begin_transaction('ignore_prepare=true')
cursor2 = session2.open_cursor(uri, None, "debug=(release_evict=true)")
cursor2.set_key(key)
if self.value_format == '8t':
# In FLCS, deleted values read back as 0.
self.assertEquals(cursor2.search(), 0)
self.assertEquals(cursor2.get_value(), 0)
else:
self.assertEquals(cursor2.search(), WT_NOTFOUND)
cursor2.reset()
# This should abort the prepared transaction.
self.session.rollback_transaction()
self.session.checkpoint()
# We should be able to read the older version of the key from the history store.
self.session.begin_transaction('read_timestamp='+self.timestamp_str(2))
cursor.set_key(key)
self.assertEqual(cursor.search(), 0)
self.assertEqual(cursor.get_value(), value1)
self.session.rollback_transaction()
# The latest version should be marked deleted.
self.session.begin_transaction()
cursor.set_key(key)
if self.value_format == '8t':
# In FLCS, deleted values read back as 0.
self.assertEquals(cursor.search(), 0)
self.assertEquals(cursor.get_value(), 0)
else:
self.assertEqual(cursor.search(), WT_NOTFOUND)
self.session.rollback_transaction()
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