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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
def timestamp_str(t):
return '%x' % t
# test_hs13.py
# Verify reverse modify traversal after eviction.
class test_hs13(wttest.WiredTigerTestCase):
conn_config = 'cache_size=2MB,statistics=(all),eviction=(threads_max=1)'
session_config = 'isolation=snapshot'
key_format_values = [
# The commented columnar tests needs to be enabled once columnar Modify type update is fixed in (WT-5550).
# ('column', dict(key_format='r')),
('integer', dict(key_format='i'))
]
scenarios = make_scenarios(key_format_values)
def test_reverse_modifies_constructed_after_eviction(self):
uri = "table:test_hs13"
create_params = 'value_format=S,key_format={}'.format(self.key_format)
value1 = 'a' * 10000
value2 = 'b' * 10000
value3 = 'e' * 10000
self.session.create(uri, create_params)
cursor = self.session.open_cursor(uri)
session2 = self.setUpSessionOpen(self.conn)
cursor2 = session2.open_cursor(uri)
# Insert a full value.
self.session.begin_transaction()
cursor[1] = value1
self.session.commit_transaction()
# Insert a modify.
self.session.begin_transaction()
cursor.set_key(1)
cursor.modify([wiredtiger.Modify('A', 0, 0)])
self.session.commit_transaction()
# Validate that we do see the correct value.
session2.begin_transaction()
cursor2.set_key(1)
cursor2.search()
self.assertEquals(cursor2.get_value(), 'A' + value1)
session2.commit_transaction()
# Reset the cursor.
cursor2.reset()
# Begin session2's transaction so it gets a snapshot prior to the full value being
# inserted below.
session2.begin_transaction()
# Insert a second modify.
self.session.begin_transaction()
cursor.set_key(1)
cursor.modify([wiredtiger.Modify('B', 1, 0)])
self.session.commit_transaction()
# Insert one more value.
self.session.begin_transaction()
cursor.set_key(1)
cursor[1] = value2
self.session.commit_transaction()
# Insert a whole bunch of data into the table to force wiredtiger to evict data
# from the previous table.
self.session.begin_transaction()
for i in range(2, 10000):
cursor[i] = value3
self.session.commit_transaction()
# Try to find the value we saw earlier.
cursor2.set_key(1)
cursor2.search()
self.assertEquals(cursor2.get_value(), 'A' + value1)
if __name__ == '__main__':
wttest.run()
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