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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 wiredtiger, wttest
from wtdataset import SimpleDataSet
from wtscenario import make_scenarios
# test_timestamp23.py
#
# delete keys repeatedly at successive timestamps
class test_timestamp23(wttest.WiredTigerTestCase):
conn_config = ''
session_config = 'isolation=snapshot'
key_format_values = [
('column', dict(key_format='r')),
('integer_row', dict(key_format='i')),
]
scenarios = make_scenarios(key_format_values)
def test_timestamp(self):
# Create a file that contains active history (content newer than the oldest timestamp).
table_uri = 'table:timestamp23'
ds = SimpleDataSet(
self, table_uri, 0, key_format=self.key_format, value_format='S', config='log=(enabled=false)')
ds.populate()
self.session.checkpoint()
key = 5
value_1 = 'a' * 500
value_2 = 'b' * 500
value_3 = 'c' * 500
# Pin oldest and stable to timestamp 1.
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(1) +
',stable_timestamp=' + self.timestamp_str(1))
cursor = self.session.open_cursor(ds.uri)
# Write two values at timestamp 10. We'll muck with the first value
# and use the second to reference the page for eviction.
self.session.begin_transaction('read_timestamp=10')
cursor[key] = value_1
cursor[key+1] = value_2
self.session.commit_transaction('commit_timestamp=11')
# Delete the first value at timestamp 20.
self.session.begin_transaction('read_timestamp=20')
cursor.set_key(key)
cursor.remove()
self.session.commit_transaction('commit_timestamp=21')
# Put it back at timestamp 30.
self.session.begin_transaction('read_timestamp=30')
cursor[key] = value_3
self.session.commit_transaction('commit_timestamp=31')
# Delete it again at timestamp 40.
self.session.begin_transaction('read_timestamp=40')
cursor.set_key(key)
cursor.remove()
self.session.commit_transaction('commit_timestamp=41')
# Evict the page using the second key.
evict_cursor = self.session.open_cursor(ds.uri, None, "debug=(release_evict)")
self.session.begin_transaction()
v = evict_cursor[key+1]
self.assertEqual(v, value_2)
self.assertEqual(evict_cursor.reset(), 0)
self.session.rollback_transaction()
# Create a separate session and a cursor to read the original value at timestamp 12.
session2 = self.conn.open_session()
cursor2 = session2.open_cursor(ds.uri)
session2.begin_transaction('read_timestamp=12')
v = cursor2[key]
self.assertEqual(v, value_1)
self.session.breakpoint()
# Now delete the original value. This _should_ cause WT_ROLLBACK, but with a column
# store bug seen and fixed in August 2021, it succeeds, and the resulting invalid
# tombstone will cause reconciliation to assert. (To see this behavior, comment out the
# self.fail call and let the transaction commit.)
try:
cursor2.remove()
self.fail("Conflicting remove did not fail")
session2.commit_transaction('commit_timestamp=50')
except wiredtiger.WiredTigerError as e:
self.assertTrue(wiredtiger.wiredtiger_strerror(wiredtiger.WT_ROLLBACK) in str(e))
cursor.close()
cursor2.close()
if __name__ == '__main__':
wttest.run()
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