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#!/usr/bin/env python
#
# Public Domain 2014-present 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.
from wiredtiger import stat
from wtscenario import make_scenarios
from helper import simulate_crash_restart
from wtdataset import SimpleDataSet
from test_rollback_to_stable01 import test_rollback_to_stable_base
def timestamp_str(t):
return '%x' % t
# test_rollback_to_stable21.py
# Test rollback to stable when an out of order prepared transaction is written to disk
class test_rollback_to_stable21(test_rollback_to_stable_base):
key_format_values = [
('column', dict(key_format='r')),
('integer_row', dict(key_format='i')),
]
scenarios = make_scenarios(key_format_values)
def conn_config(self):
config = 'cache_size=250MB,statistics=(all),statistics_log=(json,on_close,wait=1)'
return config
def test_rollback_to_stable(self):
nrows = 1000
# Prepare transactions for column store table is not yet supported.
if self.key_format == 'r':
self.skipTest('Prepare transactions for column store table is not yet supported')
# Create a table without logging.
uri = "table:rollback_to_stable21"
ds = SimpleDataSet(
self, uri, 0, key_format=self.key_format, value_format="S", config='log=(enabled=false)')
ds.populate()
# Pin oldest and stable timestamps to 10.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(10) +
',stable_timestamp=' + timestamp_str(10))
valuea = 'a' * 400
valueb = 'b' * 400
cursor = self.session.open_cursor(uri)
self.session.begin_transaction()
for i in range(1, nrows + 1):
cursor[i] = valuea
self.session.commit_transaction('commit_timestamp=' + timestamp_str(30))
self.session.begin_transaction()
for i in range(1, nrows + 1):
cursor[i] = valueb
cursor.reset()
cursor.close()
self.session.prepare_transaction('prepare_timestamp=' + timestamp_str(20))
s = self.conn.open_session()
s.begin_transaction('ignore_prepare = true')
# Configure debug behavior on a cursor to evict the page positioned on when the reset API is used.
evict_cursor = s.open_cursor(uri, None, "debug=(release_evict)")
for i in range(1, nrows + 1):
evict_cursor.set_key(i)
self.assertEquals(evict_cursor.search(), 0)
self.assertEqual(evict_cursor.get_value(), valuea)
evict_cursor.reset()
s.rollback_transaction()
self.conn.set_timestamp('stable_timestamp=' + timestamp_str(40))
s.checkpoint()
# Rollback the prepared transaction
self.session.rollback_transaction()
# Simulate a server crash and restart.
self.pr("restart")
simulate_crash_restart(self, ".", "RESTART")
self.pr("restart complete")
self.check(valuea, uri, nrows, 40)
stat_cursor = self.session.open_cursor('statistics:', None, None)
hs_removed = stat_cursor[stat.conn.txn_rts_hs_removed][2]
stat_cursor.close()
self.assertGreater(hs_removed, 0)
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