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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 wttest
from helper import simulate_crash_restart
from wtdataset import SimpleDataSet
from wtscenario import make_scenarios
# test_bug027.py
# Attempt to create a snapshot with more than 256 transactions in it.
class test_bug(wttest.WiredTigerTestCase):
conn_config = 'session_max=512'
key_format='i'
value_format='S'
def check(self, ds, nrows, value, lastvalue):
cursor = self.session.open_cursor(ds.uri)
self.session.begin_transaction()
for k, v in cursor:
if k == ds.key(nrows):
self.assertEqual(v, lastvalue)
else:
self.assertEqual(v, value)
self.session.rollback_transaction()
cursor.close()
def test_bug(self):
uri = "table:bug026"
nrows = 1000
ntxns = 500
ds = SimpleDataSet(
self, uri, 0, key_format=self.key_format, value_format=self.value_format,
config='log=(enabled=false)')
ds.populate()
value_a = "aaaaa" * 100
value_b = "bbbbb" * 100
value_c = "ccccc" * 100
# Write some data.
cursor = self.session.open_cursor(uri)
self.session.begin_transaction()
for i in range(1, nrows + 1):
cursor[ds.key(i)] = value_a
self.session.commit_transaction()
self.session.checkpoint()
# Create a bunch of transactions and leave all but one hanging.
sessions = {}
cursors = {}
for i in range(1, ntxns + 1):
sessions[i] = self.conn.open_session()
cursors[i] = sessions[i].open_cursor(uri)
sessions[i].begin_transaction()
cursors[i][ds.key(i)] = value_b
self.session.begin_transaction()
cursor[ds.key(nrows)] = value_c
self.session.commit_transaction()
self.session.checkpoint()
# Should not see value_b.
self.check(ds, nrows, value_a, value_c)
# Now crash.
simulate_crash_restart(self, ".", "RESTART")
# Should still not see value_b.
self.check(ds, nrows, value_a, value_c)
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