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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 threading, time
import wttest
import wiredtiger
from wtdataset import SimpleDataSet
from wtscenario import make_scenarios
# test_checkpoint19.py
#
# Make sure that when we open a cursor we secure the proper matching
# history store checkpoint, and don't bobble or lose it if the database
# moves on. Timestamped version.
#
# It doesn't make sense to run this test for named checkpoints, because
# regenerating a named checkpoint with the cursor open isn't allowed and
# generating two different checkpoints with different names doesn't make
# an interesting scenario. The concern is getting the matching version
# of WiredTigerCheckpoint and hanging onto it.
class test_checkpoint(wttest.WiredTigerTestCase):
session_config = 'isolation=snapshot'
format_values = [
('column-fix', dict(key_format='r', value_format='8t',
extraconfig=',allocation_size=512,leaf_page_max=512')),
('column', dict(key_format='r', value_format='S', extraconfig='')),
('string_row', dict(key_format='S', value_format='S', extraconfig='')),
]
scenarios = make_scenarios(format_values)
def large_updates(self, ds, nrows, value, ts):
cursor = self.session.open_cursor(ds.uri)
self.session.begin_transaction()
for i in range(1, nrows + 1):
cursor[ds.key(i)] = value
if i % 101 == 0:
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(ts))
self.session.begin_transaction()
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(ts))
cursor.close()
def do_checkpoint(self, ckpt_name):
if ckpt_name is None:
self.session.checkpoint()
else:
self.session.checkpoint('name=' + ckpt_name)
def check(self, cursor, nrows, oddvalue, evenvalue):
#self.session.begin_transaction()
count = 0
for k, v in cursor:
# Alas, count is even when the key number is odd.
if count % 2 == 0:
self.assertEqual(v, oddvalue)
else:
self.assertEqual(v, evenvalue)
count += 1
self.assertEqual(count, nrows)
#self.session.rollback_transaction()
def test_checkpoint(self):
uri = 'table:checkpoint17'
nrows = 1000
# Create a table.
ds = SimpleDataSet(
self, uri, 0, key_format=self.key_format, value_format=self.value_format,
config=self.extraconfig)
ds.populate()
if self.value_format == '8t':
value_a = 97
value_b = 98
value_c = 99
value_d = 100
else:
value_a = "aaaaa" * 100
value_b = "bbbbb" * 100
value_c = "ccccc" * 100
value_d = "ddddd" * 100
# Set oldest and stable to 5.
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(5) +
',stable_timestamp=' + self.timestamp_str(5))
# Write some baseline data and checkpoint it.
self.large_updates(ds, nrows, value_a, 10)
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(10))
self.session.checkpoint()
# Write more data. Touch odd keys only. Do two rounds to make sure there's history.
cursor = self.session.open_cursor(uri)
self.session.begin_transaction()
for i in range(1, nrows + 1, 2):
cursor[ds.key(i)] = value_b
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(20))
self.session.begin_transaction()
for i in range(1, nrows + 1, 2):
cursor[ds.key(i)] = value_c
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(30))
# Now checkpoint.
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(30))
self.session.checkpoint()
# Now write the other keys.
self.session.begin_transaction()
for i in range(2, nrows + 2, 2):
cursor[ds.key(i)] = value_d
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(40))
# Open the checkpoint now.
# Since we can't change the cursor read timestamp on the fly, get a separate one
# for each read time we're interested in.
def cfgstr(ts):
return 'checkpoint=WiredTigerCheckpoint,debug=(checkpoint_read_timestamp={})'.format(
self.timestamp_str(ts))
ckpt10 = self.session.open_cursor(uri, None, cfgstr(10))
ckpt20 = self.session.open_cursor(uri, None, cfgstr(20))
ckpt30 = self.session.open_cursor(uri, None, cfgstr(30))
# Take another checkpoint. Advance oldest so this checkpoint will throw away
# some of the history. (Because we've interleaved the keys, we're guaranteed
# that every history store page involved will be rewritten.) Reading from the
# first checkpoint will fail if the cursor hasn't secured itself a reference
# to its matching history store checkpoint.
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(40))
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(35))
self.session.checkpoint()
# Make sure we can still read the history.
self.check(ckpt10, nrows, value_a, value_a)
self.check(ckpt20, nrows, value_b, value_a)
self.check(ckpt30, nrows, value_c, value_a)
ckpt10.close()
ckpt20.close()
ckpt30.close()
if __name__ == '__main__':
wttest.run()
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