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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_prepare10.py
# Test to ensure prepared tombstones are properly aborted even when they are written
# to the data store.
class test_prepare10(wttest.WiredTigerTestCase):
# Force a small cache.
conn_config = 'cache_size=2MB,eviction_updates_trigger=95,eviction_updates_target=80'
session_config = 'isolation=snapshot'
def updates(self, ds, uri, nrows, value, ts):
cursor = self.session.open_cursor(uri)
self.session.begin_transaction()
for i in range(1, nrows):
cursor.set_key(ds.key(i))
cursor.set_value(value)
self.assertEquals(cursor.insert(), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(ts))
cursor.close()
def removes(self, ds, uri, nrows, ts):
cursor = self.session.open_cursor(uri)
self.session.begin_transaction()
for i in range(1, nrows):
cursor.set_key(ds.key(i))
self.assertEquals(cursor.remove(), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(ts))
cursor.close()
def check(self, ds, uri, nrows, value, ts):
cursor = self.session.open_cursor(uri)
self.session.begin_transaction('ignore_prepare=true,read_timestamp=' + timestamp_str(ts))
for i in range(1, nrows):
cursor.set_key(ds.key(i))
self.assertEquals(cursor.search(), 0)
self.assertEquals(cursor.get_value(),value)
self.session.commit_transaction()
cursor.close()
def check_not_found(self, ds, uri, nrows, ts):
cursor = self.session.open_cursor(uri)
self.session.begin_transaction('ignore_prepare=true,read_timestamp=' + timestamp_str(ts))
for i in range(1, nrows):
cursor.set_key(ds.key(i))
self.assertEquals(cursor.search(), wiredtiger.WT_NOTFOUND)
self.session.commit_transaction()
cursor.close()
def test_prepare_rollback_retrieve_time_window(self):
# Create a small table.
uri = "table:test_prepare10"
nrows = 1000
ds = SimpleDataSet(self, uri, 0, key_format="S", value_format='u')
ds.populate()
value_a = b"aaaaa" * 100
value_b = b"bbbbb" * 100
value_c = b"ccccc" * 100
# Commit some updates along with a prepared update, which is not resolved.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(10))
self.conn.set_timestamp('stable_timestamp=' + timestamp_str(10))
# Initially load huge data
self.updates(ds, uri, nrows, value_a, 20)
# Add some more updates
self.updates(ds, uri, nrows, value_b, 30)
# Checkpoint
self.session.checkpoint()
# Validate that we do see the correct value.
session2 = self.setUpSessionOpen(self.conn)
cursor2 = session2.open_cursor(uri)
session2.begin_transaction()
for i in range(1, nrows):
cursor2.set_key(ds.key(i))
self.assertEquals(cursor2.search(), 0)
self.assertEquals(cursor2.get_value(), value_b)
session2.commit_transaction()
# Reset the cursor.
cursor2.reset()
session2.begin_transaction()
# Remove all keys
self.removes(ds, uri, nrows, 40)
# Validate that we do see the correct value.
session3 = self.setUpSessionOpen(self.conn)
cursor3 = session3.open_cursor(uri)
session3.begin_transaction()
for i in range(1, nrows):
cursor3.set_key(ds.key(i))
self.assertEquals(cursor3.search(), wiredtiger.WT_NOTFOUND)
session3.commit_transaction()
# Reset the cursor.
cursor3.reset()
session3.begin_transaction()
# Remove the updates from a prepare session and and keep it open.
session_p = self.conn.open_session()
cursor_p = session_p.open_cursor(uri)
session_p.begin_transaction()
for i in range(1, nrows):
cursor_p.set_key(ds.key(i))
cursor_p.set_value(value_c)
self.assertEquals(cursor_p.insert(), 0)
session_p.prepare_transaction('prepare_timestamp=' + timestamp_str(50))
self.check(ds, uri, nrows, value_a, 20)
self.check(ds, uri, nrows, value_b, 35)
self.check_not_found(ds, uri, nrows, 60)
#rollback the prepared session
session_p.rollback_transaction()
self.check(ds, uri, nrows, value_a, 20)
self.check(ds, uri, nrows, value_b, 35)
self.check_not_found(ds, uri, nrows, 60)
# session2 still can see the value_b
for i in range(1, nrows):
cursor2.set_key(ds.key(i))
self.assertEquals(cursor2.search(), 0)
self.assertEquals(cursor2.get_value(), value_b)
session2.commit_transaction()
# session3 still can't see a value
for i in range(1, nrows):
cursor3.set_key(ds.key(i))
self.assertEquals(cursor3.search(), wiredtiger.WT_NOTFOUND)
session3.commit_transaction()
# close sessions.
cursor_p.close()
session_p.close()
cursor2.close()
session2.close()
cursor3.close()
session3.close()
self.session.close()
if __name__ == '__main__':
wttest.run()
|
