1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
#!/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_timestamp20.py
# Exercise fixing up of out-of-order updates in the history store.
class test_timestamp20(wttest.WiredTigerTestCase):
conn_config = 'cache_size=50MB'
session_config = 'isolation=snapshot'
def test_timestamp20_standard(self):
uri = 'table:test_timestamp20'
self.session.create(uri, 'key_format=S,value_format=S')
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1))
cursor = self.session.open_cursor(uri)
value1 = 'a' * 500
value2 = 'b' * 500
value3 = 'c' * 500
value4 = 'd' * 500
value5 = 'e' * 500
for i in range(1, 10000):
self.session.begin_transaction()
cursor[str(i)] = value1
self.session.commit_transaction('commit_timestamp=' + timestamp_str(10))
for i in range(1, 10000):
self.session.begin_transaction()
cursor[str(i)] = value2
self.session.commit_transaction('commit_timestamp=' + timestamp_str(20))
for i in range(1, 10000):
self.session.begin_transaction()
cursor[str(i)] = value3
self.session.commit_transaction('commit_timestamp=' + timestamp_str(30))
old_reader_session = self.conn.open_session()
old_reader_cursor = old_reader_session.open_cursor(uri)
old_reader_session.begin_transaction('read_timestamp=' + timestamp_str(20))
# Now put two updates out of order. 5 will go to the history store and will trigger a
# correction to the existing contents.
for i in range(1, 10000):
self.session.begin_transaction()
cursor[str(i)] = value4
self.session.commit_transaction('commit_timestamp=' + timestamp_str(25))
self.session.begin_transaction()
cursor[str(i)] = value5
self.session.commit_transaction('commit_timestamp=' + timestamp_str(40))
self.session.begin_transaction('read_timestamp=' + timestamp_str(30))
for i in range(1, 10000):
self.assertEqual(cursor[str(i)], value4)
self.session.rollback_transaction()
for i in range(1, 10000):
self.assertEqual(old_reader_cursor[str(i)], value2)
old_reader_session.rollback_transaction()
# In this test we're using modifies since they are more sensitive to corruptions.
#
# Corruptions to string types may go undetected since non-ASCII characters won't be included in
# the conversion to a Python string.
def test_timestamp20_modify(self):
uri = 'table:test_timestamp20'
self.session.create(uri, 'key_format=S,value_format=S')
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1))
cursor = self.session.open_cursor(uri)
value1 = 'a' * 500
value2 = 'b' * 500
value3 = 'c' * 500
# Apply the base value.
for i in range(1, 10000):
self.session.begin_transaction()
cursor[str(i)] = value1
self.session.commit_transaction('commit_timestamp=' + timestamp_str(10))
# Now apply a series of modifies.
for i in range(1, 10000):
self.session.begin_transaction()
cursor.set_key(str(i))
self.assertEqual(cursor.modify([wiredtiger.Modify('B', 100, 1)]), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(20))
for i in range(1, 10000):
self.session.begin_transaction()
cursor.set_key(str(i))
self.assertEqual(cursor.modify([wiredtiger.Modify('C', 200, 1)]), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(30))
# Open an old reader at this point.
#
# I'm trying to read the middle modify because I specifically don't want to read one that
# has been squashed into a full update.
old_reader_session = self.conn.open_session()
old_reader_cursor = old_reader_session.open_cursor(uri)
old_reader_session.begin_transaction('read_timestamp=' + timestamp_str(20))
# Now apply the last modify.
# This will be the end of the chain of modifies.
for i in range(1, 10000):
self.session.begin_transaction()
cursor.set_key(str(i))
self.assertEqual(cursor.modify([wiredtiger.Modify('D', 300, 1)]), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(40))
# Now put two updates out of order. 5 will go to the history store and will trigger a
# correction to the existing contents.
for i in range(1, 10000):
self.session.begin_transaction()
cursor[str(i)] = value2
self.session.commit_transaction('commit_timestamp=' + timestamp_str(25))
self.session.begin_transaction()
cursor[str(i)] = value3
self.session.commit_transaction('commit_timestamp=' + timestamp_str(50))
# Open up a new transaction and read at 30.
# We shouldn't be able to see past 5 due to txnid visibility.
self.session.begin_transaction('read_timestamp=' + timestamp_str(30))
for i in range(1, 10000):
self.assertEqual(cursor[str(i)], value2)
self.session.rollback_transaction()
# Put together expected value.
expected = list(value1)
expected[100] = 'B'
expected = str().join(expected)
# On the other hand, this older transaction SHOULD be able to read past the 5.
for i in range(1, 10000):
self.assertEqual(old_reader_cursor[str(i)], expected)
old_reader_session.rollback_transaction()
|
