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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 wiredtiger, wttest
from wtdataset import SimpleDataSet
from wtscenario import make_scenarios
# test_flcs03.py
#
# Test various cases associated with the location of the end of the table.
#
# FUTURE: it would be nice to pin the page to prevent reconciliation in various
# places, to make sure that we're testing on in-memory update records when we intend
# to be. (We do test on an in-memory database, but that isn't sufficient by itself;
# pages are still reconciled and that can eliminate the update configuration we're
# trying to test.
class test_flcs03(wttest.WiredTigerTestCase):
in_memory_values = [
('no_inmem', dict(in_memory=False)),
('inmem', dict(in_memory=True))
]
# Test scenarios (all appends, obviously):
# - pending uncommitted updates, before or after reconciliation
# - prepared updates, before or after reconciliation
# - committed updates that are deletes, before or after reconciliation
# - aborted updates, right away while the update records still exist
# - aborted updates, if reconciled right away while the update records still exist
# - aborted updates after the update records have been G/C'd
# - aborted updates, if reconciled after the update records have been G/C'd
# (this last is not that interesting but it follows naturally from the scenario generation)
#
# The case of reading at a time before some committed updates is tested
# on every run using the initial update set.
operation_values = [
('uncommitted', dict(op='uncommitted', prepare=False, gc=False)),
('prepared', dict(op='uncommitted', prepare=True, gc=False)),
('committed_deletes', dict(op='deleted', prepare=False, gc=False)),
('committed_prepared_deletes', dict(op='deleted', prepare=True, gc=False)),
('aborted', dict(op='aborted', prepare=False, gc=False)),
('aborted_GC', dict(op='aborted', prepare=False, gc=True)),
]
reconcile_values = [
('no_reconcile', dict(reconcile=False)),
('reconcile', dict(reconcile=True)),
]
scenarios = make_scenarios(in_memory_values, operation_values, reconcile_values)
def conn_config(self):
if self.in_memory:
return 'in_memory=true'
else:
return 'in_memory=false'
# Evict the page to force reconciliation.
def evict(self, uri, key, check_value):
evict_cursor = self.session.open_cursor(uri, None, "debug=(release_evict)")
self.session.begin_transaction()
v = evict_cursor[key]
self.assertEqual(v, check_value)
self.assertEqual(evict_cursor.reset(), 0)
self.session.rollback_transaction()
evict_cursor.close()
def check_end(self, cursor, hint, ts, expected_last_key):
readtime = 'read_timestamp=' + self.timestamp_str(ts)
self.session.begin_transaction(readtime + ',ignore_prepare=true')
cursor.reset()
if hint is not None:
cursor.set_key(hint)
self.assertEqual(cursor.search(), 0)
last = None
while cursor.next() != wiredtiger.WT_NOTFOUND:
last = cursor.get_key()
self.assertEqual(last, expected_last_key)
cursor.reset()
self.assertEqual(cursor.prev(), 0)
last = cursor.get_key()
self.assertEqual(last, expected_last_key)
self.session.rollback_transaction()
def check_end_empty(self, cursor, ts):
self.session.begin_transaction('read_timestamp=' + self.timestamp_str(ts))
cursor.reset()
self.assertEqual(cursor.next(), wiredtiger.WT_NOTFOUND)
cursor.reset()
self.assertEqual(cursor.prev(), wiredtiger.WT_NOTFOUND)
self.session.rollback_transaction()
def test_flcs(self):
uri = "table:test_flcs03"
nrows = 10
ds = SimpleDataSet(
self, uri, 0, key_format='r', value_format='6t', config='leaf_page_max=4096')
ds.populate()
# Pin oldest and stable to timestamp 1.
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(1) +
',stable_timestamp=' + self.timestamp_str(1))
cursor = self.session.open_cursor(uri)
# The table should end without any keys.
self.check_end_empty(cursor, 5)
# Write a few records at time 10.
self.session.begin_transaction()
for i in range(1, nrows + 1):
cursor[i] = i
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(10))
# Current behavior: this extends the table before the commit as well as at/after.
self.check_end(cursor, None, 5, nrows)
self.check_end(cursor, None, 10, nrows)
self.check_end(cursor, None, 11, nrows)
# Make another session to do the operation in.
session2 = self.conn.open_session()
cursor2 = session2.open_cursor(uri)
append_key = nrows * 2
append_key_lite = nrows + 2
# Do the requested operation.
if self.op == 'uncommitted':
session2.begin_transaction('read_timestamp=' + self.timestamp_str(15))
cursor2[append_key] = 20
elif self.op == 'deleted':
session2.begin_transaction('read_timestamp=' + self.timestamp_str(15))
cursor2[append_key] = 21
cursor2.set_key(append_key)
self.assertEqual(cursor2.remove(), 0)
else:
self.assertEqual(self.op, 'aborted')
session2.begin_transaction('read_timestamp=' + self.timestamp_str(15))
cursor2[append_key] = 22
session2.rollback_transaction()
if self.prepare:
session2.prepare_transaction('prepare_timestamp=' + self.timestamp_str(19))
if self.op == 'deleted':
committime = 'commit_timestamp=' + self.timestamp_str(20)
if self.prepare:
durabletime = ',durable_timestamp=' + self.timestamp_str(21)
else:
durabletime = ''
session2.commit_transaction(committime + durabletime)
if self.gc:
session2.begin_transaction('read_timestamp=' + self.timestamp_str(25))
# Churn the append list enough to clean out the previous aborted updates.
for i in range(0, 20):
cursor2[append_key_lite] = 30 + i
cursor2[append_key_lite + 1] = 31 + i
session2.commit_transaction('commit_timestamp=' + self.timestamp_str(30))
if self.reconcile:
# This will all fit on one page, so we only need to evict once.
self.evict(uri, nrows, nrows)
# For aborted without G/C, we could lose the aborted update records at any point, so
# do the most interesting checks first.
#
# Current behavior for all cases is that the table extends out to the append key,
# including in the past.
#
# Without a way to prevent reconciliation it's not entirely clear that the aborted
# with G/C case doesn't get reconciled (which currently physically extends the table
# in a way that cannot be rolled back) before the updates are tossed. If that happens,
# the table definitely extends. If it doesn't, it might not. Maybe.
if self.op == 'aborted' and not self.gc:
self.check_end(cursor, nrows-1, 30, append_key)
self.check_end(cursor, nrows-1, 10, append_key)
self.check_end(cursor, None, 5, append_key)
else:
self.check_end(cursor, None, 5, append_key)
self.check_end(cursor, None, 10, append_key)
self.check_end(cursor, None, 19, append_key)
self.check_end(cursor, None, 20, append_key)
self.check_end(cursor, None, 21, append_key)
self.check_end(cursor, None, 30, append_key)
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