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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 wiredtiger import stat, WiredTigerError, wiredtiger_strerror, WT_ROLLBACK
from wtdataset import SimpleDataSet
from wtscenario import make_scenarios
# test_truncate10.py
#
# Check that nothing comes unstuck if we commit a truncate with durable > commit.
class test_truncate10(wttest.WiredTigerTestCase):
conn_config = 'statistics=(all)'
session_config = 'isolation=snapshot'
# Hook to run using remove instead of truncate for reference. This should not alter the
# behavior... but may if things are broken. Disable the reference version by default as it's
# only useful when investigating behavior changes. This list is first in the make_scenarios
# call so the additional cases don't change the scenario numbering.
trunc_values = [
('truncate', dict(trunc_with_remove=False)),
#('remove', dict(trunc_with_remove=True)),
]
format_values = [
('column', dict(key_format='r', value_format='S', extraconfig='')),
('column_fix', dict(key_format='r', value_format='8t',
extraconfig=',allocation_size=512,leaf_page_max=512')),
('integer_row', dict(key_format='i', value_format='S', extraconfig='')),
]
# Try various stable times.
stable_values = [
('10', dict(stable_timestamp=10)),
('20', dict(stable_timestamp=20)),
('25', dict(stable_timestamp=25)),
('30', dict(stable_timestamp=30)),
]
# Try both with and without an intermediate checkpoint.
checkpoint_values = [
('checkpoint', dict(do_checkpoint=True)),
('no-checkpoint', dict(do_checkpoint=False)),
]
scenarios = make_scenarios(trunc_values, format_values, stable_values, checkpoint_values)
def truncate(self, uri, make_key, keynum1, keynum2):
if self.trunc_with_remove:
cursor = self.session.open_cursor(uri)
err = 0
for k in range(keynum1, keynum2 + 1):
cursor.set_key(k)
try:
err = cursor.remove()
except WiredTigerError as e:
if wiredtiger_strerror(WT_ROLLBACK) in str(e):
err = WT_ROLLBACK
else:
raise e
if err != 0:
break
cursor.close()
else:
lo_cursor = self.session.open_cursor(uri)
hi_cursor = self.session.open_cursor(uri)
lo_cursor.set_key(make_key(keynum1))
hi_cursor.set_key(make_key(keynum2))
try:
err = self.session.truncate(None, lo_cursor, hi_cursor, None)
except WiredTigerError as e:
if wiredtiger_strerror(WT_ROLLBACK) in str(e):
err = WT_ROLLBACK
else:
raise e
lo_cursor.close()
hi_cursor.close()
return err
def check(self, uri, make_key, nrows, nzeros, value, ts):
cursor = self.session.open_cursor(uri)
self.session.begin_transaction('read_timestamp=' + self.timestamp_str(ts))
seen = 0
zseen = 0
for k, v in cursor:
if self.value_format == '8t' and v == 0:
zseen += 1
else:
self.assertEqual(v, value)
seen += 1
self.assertEqual(seen, nrows)
self.assertEqual(zseen, nzeros if self.value_format == '8t' else 0)
self.session.rollback_transaction()
cursor.close()
def test_truncate10(self):
nrows = 10000
uri = "table:truncate10"
ds = SimpleDataSet(
self, uri, 0, key_format=self.key_format, value_format=self.value_format,
config='log=(enabled=false)' + self.extraconfig)
ds.populate()
if self.value_format == '8t':
value_a = 97
value_b = 98
else:
value_a = "aaaaa" * 100
value_b = "bbbbb" * 100
# Pin oldest and stable timestamps to 1.
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(1) +
',stable_timestamp=' + self.timestamp_str(1))
# Write a bunch of data at time 10.
cursor = self.session.open_cursor(ds.uri)
self.session.begin_transaction()
for i in range(1, nrows + 1):
cursor[ds.key(i)] = value_a
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(10))
# Mark it stable.
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(10))
# Reopen the connection so nothing is in memory and we can fast-truncate.
self.reopen_conn()
# Truncate the data at time 25, but prepare at 20 and make durable 30.
self.session.begin_transaction()
err = self.truncate(ds.uri, ds.key, nrows // 4 + 1, nrows // 4 + nrows // 2)
self.assertEqual(err, 0)
self.session.prepare_transaction('prepare_timestamp=' + self.timestamp_str(20))
self.session.timestamp_transaction('commit_timestamp=' + self.timestamp_str(25))
self.session.commit_transaction('durable_timestamp=' + self.timestamp_str(30))
# Make sure we did at least one fast-delete. (Unless we specifically didn't want to,
# or running on FLCS where it isn't supported.)
stat_cursor = self.session.open_cursor('statistics:', None, None)
fastdelete_pages = stat_cursor[stat.conn.rec_page_delete_fast][2]
if self.value_format == '8t' or self.trunc_with_remove:
self.assertEqual(fastdelete_pages, 0)
else:
self.assertGreater(fastdelete_pages, 0)
# Optionally advance stable.
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(self.stable_timestamp))
# Optionally checkpoint.
if self.do_checkpoint:
self.session.checkpoint()
# Validate the data.
# At time 10 we should see all value_a.
self.check(ds.uri, ds.key, nrows, 0, value_a, 10)
# At time 20 we should still see all value_a.
self.check(ds.uri, ds.key, nrows, 0, value_a, 20)
# At time 25 we should still see half value_a, and for FLCS, half zeros.
# (Note that reading between commit and durable can be problematic, but for
# now at least it remains permitted.)
self.check(ds.uri, ds.key, nrows // 2, nrows // 2, value_a, 25)
# At time 30 we should also see half value_a, and for FLCS, half zeros.
self.check(ds.uri, ds.key, nrows // 2, nrows // 2, value_a, 30)
# Move the stable timestamp forward before exiting so we don't waste time rolling
# back the changes during shutdown.
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(50))
if __name__ == '__main__':
wttest.run()
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