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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.
import wttest, threading, wiredtiger
from helper import simulate_crash_restart
from wtscenario import make_scenarios
# test_hs24.py
# Test that out of order timestamp fix racing with checkpointing the history store doesn't create inconsistent checkpoint.
class test_hs24(wttest.WiredTigerTestCase):
key_format_values = [
('column', dict(key_format='r')),
('integer_row', dict(key_format='i')),
]
checkpoint_stress_scenarios = [
('checkpoint_slow_stress', dict(checkpoint_stress='checkpoint_slow')),
('history_store_checkpoint_delay_stress', dict(checkpoint_stress='history_store_checkpoint_delay')),
]
scenarios = make_scenarios(key_format_values, checkpoint_stress_scenarios)
def conn_config(self):
return 'timing_stress_for_test=({})'.format(self.checkpoint_stress)
session_config = 'isolation=snapshot'
uri = 'table:test_hs24'
numrows = 2000
value1 = 'a' * 500
value2 = 'b' * 500
value3 = 'c' * 500
value4 = 'd' * 500
def test_zero_ts(self):
self.session.create(self.uri, 'key_format={},value_format=S'. format(self.key_format))
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(1))
cursor = self.session.open_cursor(self.uri)
for i in range(1, self.numrows + 1):
self.session.begin_transaction()
cursor[i] = self.value1
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(4))
self.session.begin_transaction()
cursor[i] = self.value2
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(5))
cursor.close()
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(5))
thread = threading.Thread(target=self.zero_ts_deletes)
thread.start()
self.session.checkpoint()
thread.join()
simulate_crash_restart(self, '.', "RESTART")
cursor = self.session.open_cursor(self.uri)
session2 = self.conn.open_session(None)
cursor2 = session2.open_cursor(self.uri)
self.session.begin_transaction('read_timestamp=' + self.timestamp_str(5))
session2.begin_transaction('read_timestamp=' + self.timestamp_str(4))
# Check the data store and the history store content is consistent.
# If we have a value in the data store, we should see the older
# version in the history store as well.
newer_data_visible = False
for i in range(1, self.numrows + 1):
cursor.set_key(i)
cursor2.set_key(i)
ret = cursor.search()
ret2 = cursor2.search()
if not newer_data_visible:
newer_data_visible = ret != wiredtiger.WT_NOTFOUND
if newer_data_visible:
self.assertEquals(cursor.get_value(), self.value2)
self.assertEquals(cursor2.get_value(), self.value1)
else:
self.assertEquals(ret2, wiredtiger.WT_NOTFOUND)
session2.rollback_transaction()
self.session.rollback_transaction()
def zero_ts_deletes(self):
session = self.setUpSessionOpen(self.conn)
cursor = session.open_cursor(self.uri)
for i in range(1, self.numrows + 1):
session.begin_transaction()
cursor.set_key(i)
cursor.remove()
session.commit_transaction()
cursor.close()
session.close()
def test_zero_commit(self):
self.session.create(self.uri, 'key_format={},value_format=S'.format(self.key_format))
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(1))
cursor = self.session.open_cursor(self.uri)
for i in range(1, self.numrows + 1):
self.session.begin_transaction()
cursor[i] = self.value1
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(4))
self.session.begin_transaction()
cursor[i] = self.value2
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(5))
cursor.close()
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(4))
thread = threading.Thread(target=self.zero_ts_commits)
thread.start()
self.session.checkpoint()
thread.join()
simulate_crash_restart(self, '.', "RESTART")
cursor = self.session.open_cursor(self.uri)
self.session.begin_transaction('read_timestamp=' + self.timestamp_str(4))
# Check we can only see the version committed by the zero timestamp
# commit thread before the checkpoint starts or value1.
newer_data_visible = False
for i in range(1, self.numrows + 1):
value = cursor[i]
if not newer_data_visible:
newer_data_visible = value != self.value3
if newer_data_visible:
self.assertEquals(value, self.value1)
else:
self.assertEquals(value, self.value3)
self.session.rollback_transaction()
def zero_ts_commits(self):
session = self.setUpSessionOpen(self.conn)
cursor = session.open_cursor(self.uri)
for i in range(1, self.numrows + 1):
session.begin_transaction()
cursor[i] = self.value3
session.commit_transaction()
cursor.close()
session.close()
def test_out_of_order_ts(self):
self.session.create(self.uri, 'key_format={},value_format=S'.format(self.key_format))
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(1))
cursor = self.session.open_cursor(self.uri)
for i in range(1, self.numrows + 1):
self.session.begin_transaction()
cursor[i] = self.value1
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(4))
self.session.begin_transaction()
cursor[i] = self.value2
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(5))
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(4))
for i in range(1, self.numrows + 1):
self.session.begin_transaction()
cursor[i] = self.value3
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(6))
cursor.close()
thread = threading.Thread(target=self.out_of_order_ts_commits)
thread.start()
self.session.checkpoint()
thread.join()
simulate_crash_restart(self, '.', "RESTART")
cursor = self.session.open_cursor(self.uri)
self.session.begin_transaction('read_timestamp=' + self.timestamp_str(4))
# Check we can only see the version at timestamp 4, it's either
# committed by the out of order timestamp commit thread before the
# checkpoint starts or value1.
newer_data_visible = False
for i in range(1, self.numrows + 1):
value = cursor[i]
if not newer_data_visible:
newer_data_visible = value != self.value4
if newer_data_visible:
self.assertEquals(value, self.value1)
else:
self.assertEquals(value, self.value4)
self.session.rollback_transaction()
def out_of_order_ts_commits(self):
session = self.setUpSessionOpen(self.conn)
cursor = session.open_cursor(self.uri)
for i in range(1, self.numrows + 1):
session.begin_transaction()
cursor[i] = self.value4
session.commit_transaction('commit_timestamp=' + self.timestamp_str(4))
cursor.close()
session.close()
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