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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 fnmatch, os, shutil, time
from helper import copy_wiredtiger_home
import wiredtiger, wttest
from wtdataset import SimpleDataSet
def timestamp_str(t):
return '%x' % t
# test_prepare07.py
# Test to ensure prepared updates older than oldest timestamp are not visible.
# this test is mainly to ensure there is no gap in txn_visible_all when active
# oldest transaction is a prepared transaction, and the oldest timestamp advanced
# past the prepared timestamp.
class test_prepare07(wttest.WiredTigerTestCase):
# Force a small cache.
conn_config = 'cache_size=50MB'
def older_prepare_updates(self, uri, ds, nrows, value_a):
# Commit some updates along with a prepared update, which is not resolved.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(100))
self.conn.set_timestamp('stable_timestamp=' + timestamp_str(100))
# Commit some updates.
value_b = b"bbbbb" * 100
cursor = self.session.open_cursor(uri)
self.session.begin_transaction('isolation=snapshot')
cursor.set_key(ds.key(nrows + 1))
cursor.set_value(value_b)
self.assertEquals(cursor.update(), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(110))
self.session.begin_transaction('isolation=snapshot')
cursor.set_key(ds.key(nrows + 2))
cursor.set_value(value_b)
self.assertEquals(cursor.update(), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(120))
# Prepare a transaction and keep it open.
session_p = self.conn.open_session()
cursor_p = session_p.open_cursor(uri)
session_p.begin_transaction('isolation=snapshot')
cursor_p.set_key(ds.key(nrows + 3))
cursor_p.set_value(value_b)
self.assertEquals(cursor_p.update(), 0)
session_p.prepare_transaction('prepare_timestamp=' + timestamp_str(130))
# Commit some more updates.
self.session.begin_transaction('isolation=snapshot')
cursor.set_key(ds.key(nrows + 4))
cursor.set_value(value_b)
self.assertEquals(cursor.update(), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(140))
self.session.begin_transaction('isolation=snapshot')
cursor.set_key(ds.key(nrows + 5))
cursor.set_value(value_b)
self.assertEquals(cursor.update(), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(150))
# Move the oldest and the stable timestamp to the latest.
self.conn.set_timestamp('stable_timestamp=' + timestamp_str(155))
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(155))
# Commit an update newer than the stable timestamp.
self.session.begin_transaction('isolation=snapshot')
cursor.set_key(ds.key(nrows + 6))
cursor.set_value(value_b)
self.assertEquals(cursor.update(), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(160))
# Take a checkpoint here, so that prepared transaction will not be durable..
self.session.checkpoint()
# Commit the prepared transaction.
session_p.commit_transaction('commit_timestamp=' + timestamp_str(140) + ',durable_timestamp=' + timestamp_str(160))
# Take a backup and check the values.
self.backup_dir = os.path.join(self.home, "WT_BACKUP")
self.backup(self.backup_dir)
backup_conn = self.wiredtiger_open(self.backup_dir)
session_b = backup_conn.open_session()
cursor_b = session_b.open_cursor(uri)
# Committed non - prepared transactions data should be seen.
cursor_b.set_key(ds.key(nrows + 1))
self.assertEquals(cursor_b.search(), 0)
self.assertEquals(cursor_b.get_value(),value_b)
cursor_b.set_key(ds.key(nrows + 2))
self.assertEquals(cursor_b.search(), 0)
self.assertEquals(cursor_b.get_value(),value_b)
# Committed prepared transaction data should not be seen.
cursor_b.set_key(ds.key(nrows + 3))
self.assertEquals(cursor_b.search(), 0)
self.assertEquals(cursor_b.get_value(),value_a)
# Committed non - prepared transactions data should be seen.
cursor_b.set_key(ds.key(nrows + 4))
self.assertEquals(cursor_b.search(), 0)
self.assertEquals(cursor_b.get_value(),value_b)
cursor_b.set_key(ds.key(nrows + 5))
self.assertEquals(cursor_b.search(), 0)
self.assertEquals(cursor_b.get_value(),value_b)
# Committed transactions newer to the stable timestamp should not be seen.
cursor_b.set_key(ds.key(nrows + 6))
self.assertEquals(cursor_b.search(), 0)
self.assertEquals(cursor_b.get_value(),value_a)
# close sessions.
cursor_p.close()
session_p.close()
cursor.close()
self.session.close()
cursor_b.close()
session_b.close()
def test_older_prepare_updates(self):
# Create a small table.
uri = "table:test"
nrows = 100
ds = SimpleDataSet(self, uri, nrows, key_format="S", value_format='u')
ds.populate()
value_a = b"aaaaa" * 100
# Initially load huge data
cursor = self.session.open_cursor(uri)
for i in range(1, 10000):
cursor.set_key(ds.key(nrows + i))
cursor.set_value(value_a)
self.assertEquals(cursor.insert(), 0)
cursor.close()
self.session.checkpoint()
# Check if txn_visible_all is working properly, when an active oldest
# transaction is a prepared transaction and the oldest timestamp
# advances beyond the prepared timestamp.
self.older_prepare_updates(uri, ds, nrows, value_a)
if __name__ == '__main__':
wttest.run()
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