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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 wiredtiger import stat
from wtscenario import make_scenarios
def timestamp_str(t):
return '%x' % t
# test_hs09.py
# Verify that we write the newest committed version to data store and the
# second newest committed version to history store.
class test_hs09(wttest.WiredTigerTestCase):
# Force a small cache.
conn_config = 'cache_size=20MB,statistics=(fast)'
session_config = 'isolation=snapshot'
uri = "table:test_hs09"
key_format_values = [
('column', dict(key_format='r')),
('integer', dict(key_format='i')),
('string', dict(key_format='S')),
]
scenarios = make_scenarios(key_format_values)
def create_key(self, i):
if self.key_format == 'S':
return str(i)
return i
def check_ckpt_hs(self, expected_data_value, expected_hs_value, expected_hs_start_ts,
expected_hs_stop_ts, expect_prepared_in_datastore = False):
session = self.conn.open_session(self.session_config)
session.checkpoint()
# Check the data file value.
cursor = session.open_cursor(self.uri, None, 'checkpoint=WiredTigerCheckpoint')
# If we are expecting prepapred updates in the datastore, start an explicit transaction with
# ignore prepare flag to avoid getting a WT_PREPARE_CONFLICT error.
if expect_prepared_in_datastore:
session.begin_transaction("ignore_prepare=true")
for _, value in cursor:
self.assertEqual(value, expected_data_value)
if expect_prepared_in_datastore:
session.rollback_transaction()
cursor.close()
# Check the history store file value.
cursor = session.open_cursor("file:WiredTigerHS.wt", None, 'checkpoint=WiredTigerCheckpoint')
for _, _, hs_start_ts, _, hs_stop_ts, _, type, value in cursor:
# No WT_UPDATE_TOMBSTONE in the history store.
self.assertNotEqual(type, 5)
# No WT_UPDATE_BIRTHMARK in the history store.
self.assertNotEqual(type, 1)
# WT_UPDATE_STANDARD
if (type == 4):
self.assertEqual(value.decode(), expected_hs_value + '\x00')
self.assertEqual(hs_start_ts, expected_hs_start_ts)
self.assertEqual(hs_stop_ts, expected_hs_stop_ts)
cursor.close()
session.close()
def test_uncommitted_updates_not_written_to_hs(self):
# Create a small table.
create_params = 'key_format={},value_format=S'.format(self.key_format)
self.session.create(self.uri, create_params)
value1 = 'a' * 500
value2 = 'b' * 500
value3 = 'c' * 500
# Load 500KB of data.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1))
cursor = self.session.open_cursor(self.uri)
self.session.begin_transaction()
for i in range(1, 1000):
cursor[self.create_key(i)] = value1
self.session.commit_transaction('commit_timestamp=' + timestamp_str(2))
# Load another 500KB of data with a later timestamp.
self.session.begin_transaction()
for i in range(1, 1000):
cursor[self.create_key(i)] = value2
self.session.commit_transaction('commit_timestamp=' + timestamp_str(3))
# Uncommitted changes.
self.session.begin_transaction()
for i in range(1, 11):
cursor[self.create_key(i)] = value3
self.check_ckpt_hs(value2, value1, 2, 3)
def test_prepared_updates_not_written_to_hs(self):
# Prepare reads currently not supported with columnar store.
# Remove this once prepare reads is supported in WT-6061.
if self.key_format == 'r':
return
# Create a small table.
create_params = 'key_format={},value_format=S'.format(self.key_format)
self.session.create(self.uri, create_params)
value1 = 'a' * 500
value2 = 'b' * 500
value3 = 'c' * 500
# Load 1MB of data.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1))
cursor = self.session.open_cursor(self.uri)
self.session.begin_transaction()
for i in range(1, 2000):
cursor[self.create_key(i)] = value1
self.session.commit_transaction('commit_timestamp=' + timestamp_str(2))
# Load another 1MB of data with a later timestamp.
self.session.begin_transaction()
for i in range(1, 2000):
cursor[self.create_key(i)] = value2
self.session.commit_transaction('commit_timestamp=' + timestamp_str(3))
# Prepare some updates.
self.session.begin_transaction()
for i in range(1, 11):
cursor[self.create_key(i)] = value3
self.session.prepare_transaction('prepare_timestamp=' + timestamp_str(4))
# We can expect prepared values to show up in data store if the eviction runs between now
# and the time when we open a cursor on the user table.
self.check_ckpt_hs(value2, value1, 2, 3, True)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(5) +
',durable_timestamp=' + timestamp_str(5))
def test_write_newest_version_to_data_store(self):
# Create a small table.
create_params = 'key_format={},value_format=S'.format(self.key_format)
self.session.create(self.uri, create_params)
value1 = 'a' * 500
value2 = 'b' * 500
# Load 500KB of data.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1))
cursor = self.session.open_cursor(self.uri)
self.session.begin_transaction()
for i in range(1, 1000):
cursor[self.create_key(i)] = value1
self.session.commit_transaction('commit_timestamp=' + timestamp_str(2))
# Load another 500KB of data with a later timestamp.
self.session.begin_transaction()
for i in range(1, 1000):
cursor[self.create_key(i)] = value2
self.session.commit_transaction('commit_timestamp=' + timestamp_str(3))
self.check_ckpt_hs(value2, value1, 2, 3)
def test_write_deleted_version_to_data_store(self):
# Create a small table.
create_params = 'key_format={},value_format=S'.format(self.key_format)
self.session.create(self.uri, create_params)
value1 = 'a' * 500
value2 = 'b' * 500
# Load 500KB of data.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1))
cursor = self.session.open_cursor(self.uri)
self.session.begin_transaction()
for i in range(1, 1000):
cursor[self.create_key(i)] = value1
self.session.commit_transaction('commit_timestamp=' + timestamp_str(2))
# Load another 500KB of data with a later timestamp.
self.session.begin_transaction()
for i in range(1, 1000):
cursor[self.create_key(i)] = value2
self.session.commit_transaction('commit_timestamp=' + timestamp_str(3))
# Delete records.
self.session.begin_transaction()
for i in range(1, 1000):
cursor = self.session.open_cursor(self.uri)
cursor.set_key(self.create_key(i))
self.assertEqual(cursor.remove(), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(4))
self.check_ckpt_hs(value2, value1, 2, 3)
if __name__ == '__main__':
wttest.run()
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