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#!/usr/bin/env python
#
# Public Domain 2014-2019 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
def timestamp_str(t):
return '%x' %t
# test_debug_mode05.py
# As per WT-5046, the debug table logging settings prevent rollback to
# stable in the presence of prepared transactions.
#
# This test is to confirm the fix and prevent similar regressions.
class test_debug_mode05(wttest.WiredTigerTestCase):
conn_config = 'log=(enabled),debug_mode=(table_logging=true)'
session_config = 'isolation=snapshot'
uri = 'file:test_debug_mode05'
def test_table_logging_rollback_to_stable(self):
self.session.create(self.uri, 'key_format=i,value_format=u')
cursor = self.session.open_cursor(self.uri, None)
self.conn.set_timestamp('stable_timestamp=' + timestamp_str(100))
# Try doing a normal prepared txn and then rollback to stable.
self.session.begin_transaction()
for i in range(1, 50):
cursor[i] = b'a' * 100
self.session.prepare_transaction(
'prepare_timestamp=' + timestamp_str(150))
self.session.timestamp_transaction(
'commit_timestamp=' + timestamp_str(200))
self.session.timestamp_transaction(
'durable_timestamp=' + timestamp_str(250))
self.session.commit_transaction()
self.conn.rollback_to_stable()
# The original bug happened when we had a txn that:
# 1. Was prepared.
# 2. Did not cause anything to be written to the log before committing.
# 3. Was the last txn before the rollback to stable call.
# Therefore, we're specifically not doing any operations here.
self.session.begin_transaction()
self.session.prepare_transaction(
'prepare_timestamp=' + timestamp_str(300))
self.session.timestamp_transaction(
'commit_timestamp=' + timestamp_str(350))
self.session.timestamp_transaction(
'durable_timestamp=' + timestamp_str(400))
self.session.commit_transaction()
# The aforementioned bug resulted in a failure in rollback to stable.
# This is because we failed to clear out a txn id from our global state
# which caused us to think that we had a running txn.
# Verify that we can rollback to stable without issues.
self.conn.rollback_to_stable()
self.session.begin_transaction()
for i in range(1, 50):
cursor[i] = b'b' * 100
self.session.commit_transaction(
'commit_timestamp=' + timestamp_str(450))
self.conn.rollback_to_stable()
if __name__ == '__main__':
wttest.run()
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