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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 WiredTigerError, wiredtiger_strerror, WT_ROLLBACK, WT_PREPARE_CONFLICT
from wtdataset import SimpleDataSet
from wtscenario import make_scenarios
# test_truncate07.py
#
# Check what happens if you try to truncate prepared values.
class test_truncate07(wttest.WiredTigerTestCase):
conn_config = ''
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 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='')),
]
munge_values = [
('update', dict(munge_with_update=True)),
('remove', dict(munge_with_update=False)),
]
# Try both with and without evicting the pages before truncating (which allows the
# fast-delete code to run).
eviction_values = [
('eviction', dict(do_evict=True)),
('no-eviction', dict(do_evict=False)),
]
# Also 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, munge_values, eviction_values, checkpoint_values)
# Make all the values different so it's easier to see what happens if ranges go missing.
def mkdata(self, basevalue, i):
if self.value_format == '8t':
return basevalue
return basevalue + str(i)
def evict(self, uri, key, value):
evict_cursor = self.session.open_cursor(uri, None, "debug=(release_evict)")
self.session.begin_transaction()
v = evict_cursor[key]
self.assertEqual(v, value)
self.assertEqual(evict_cursor.reset(), 0)
self.session.rollback_transaction()
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
elif wiredtiger_strerror(WT_PREPARE_CONFLICT) in str(e):
err = WT_PREPARE_CONFLICT
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
elif wiredtiger_strerror(WT_PREPARE_CONFLICT) in str(e):
err = WT_PREPARE_CONFLICT
else:
raise e
lo_cursor.close()
hi_cursor.close()
return err
def test_truncate07(self):
nrows = 10000
uri = "table:truncate07"
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))
# This data can be stable; move the stable timestamp forward.
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(10))
# Munge some of it at time 20. Touch every other even-numbered key in the middle third of
# the data. (This allows using the odd keys to evict.)
#
# Use a separate session because we're going to prepare the transaction and we want to
# be able to do other things afterward.
session2 = self.conn.open_session()
cursor2 = session2.open_cursor(ds.uri)
session2.begin_transaction()
start = nrows // 3
if start % 2 == 1:
start += 1
for i in range(start, 2 * nrows // 3, 2):
cursor2.set_key(ds.key(i))
if self.munge_with_update:
cursor2.set_value(value_b)
self.assertEqual(cursor2.update(), 0)
else:
self.assertEqual(cursor2.remove(), 0)
session2.prepare_transaction('prepare_timestamp=' + self.timestamp_str(20))
cursor2.close()
# Evict the lot so that we can fast-truncate.
# For now, evict every 4th key explicitly; FUTURE: improve this to evict each page only
# once when we have a good way to do that.
if self.do_evict:
for i in range(1, nrows + 1, 4):
self.evict(ds.uri, ds.key(i), value_a)
if self.do_checkpoint:
self.session.checkpoint()
# Truncate the data, including what we prepared.
self.session.begin_transaction()
err = self.truncate(ds.uri, ds.key, nrows // 4, nrows - nrows // 4)
self.assertEqual(err, WT_PREPARE_CONFLICT)
self.session.rollback_transaction()
# Move the stable timestamp forward before exiting so we don't waste time rolling
# back the rest of the changes during shutdown.
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(50))
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