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#!/usr/bin/env python
#
# Public Domain 2014-2020 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.
from helper import copy_wiredtiger_home
import unittest, wiredtiger, wttest
from wtdataset import SimpleDataSet
import os, shutil
from wtscenario import make_scenarios
from wiredtiger import stat
def timestamp_str(t):
return '%x' % t
# test_prepare_hs03.py
# test to ensure salvage, verify & simulating crash are working for prepared transactions.
class test_prepare_hs03(wttest.WiredTigerTestCase):
# Force a small cache.
conn_config = 'cache_size=50MB,statistics=(fast)'
# Create a small table.
uri = "table:test_prepare_hs03"
scenarios = make_scenarios([
('corrupt_table', dict(corrupt=True)),
('dont_corrupt_table', dict(corrupt=False))
])
def corrupt_table(self):
tablename="test_prepare_hs03.wt"
self.assertEquals(os.path.exists(tablename), True)
with open(tablename, 'r+') as tablepointer:
tablepointer.seek(1024)
tablepointer.write('Bad!' * 1024)
def corrupt_salvage_verify(self):
if self.corrupt == True:
self.corrupt_table()
self.session.salvage(self.uri, "force")
self.session.verify(self.uri, None)
def get_stat(self, stat):
stat_cursor = self.session.open_cursor('statistics:')
val = stat_cursor[stat][2]
stat_cursor.close()
return val
def prepare_updates(self, ds, nrows, nsessions, nkeys):
# Insert some records with commit timestamp, corrupt file and call salvage, verify before checkpoint.
# Commit some updates to get eviction and history store fired up
commit_value = b"bbbbb" * 100
cursor = self.session.open_cursor(self.uri)
for i in range(1, nsessions * nkeys):
self.session.begin_transaction('isolation=snapshot')
cursor.set_key(ds.key(nrows + i))
cursor.set_value(commit_value)
self.assertEquals(cursor.insert(), 0)
self.session.commit_transaction('commit_timestamp=' + timestamp_str(1))
cursor.close()
# Corrupt the table, Call salvage to recover data from the corrupted table and call verify
self.corrupt_salvage_verify()
# Call checkpoint
self.session.checkpoint()
hs_writes_start = self.get_stat(stat.conn.cache_write_hs)
# Have prepared updates in multiple sessions. This should ensure writing
# prepared updates to the history store
sessions = [0] * nsessions
cursors = [0] * nsessions
prepare_value = b"ccccc" * 100
for j in range (0, nsessions):
sessions[j] = self.conn.open_session()
sessions[j].begin_transaction('isolation=snapshot')
cursors[j] = sessions[j].open_cursor(self.uri)
# Each session will update many consecutive keys.
start = (j * nkeys)
end = start + nkeys
for i in range(start, end):
cursors[j].set_key(ds.key(nrows + i))
cursors[j].set_value(prepare_value)
self.assertEquals(cursors[j].insert(), 0)
sessions[j].prepare_transaction('prepare_timestamp=' + timestamp_str(4))
hs_writes = self.get_stat(stat.conn.cache_write_hs) - hs_writes_start
# Assert if not writing anything to the history store.
self.assertGreaterEqual(hs_writes, 0)
# Test if we can read prepared updates from the history store.
cursor = self.session.open_cursor(self.uri)
self.session.begin_transaction('read_timestamp=' + timestamp_str(3))
for i in range(1, nsessions * nkeys):
cursor.set_key(ds.key(nrows + i))
# The search should pass.
self.assertEqual(cursor.search(), 0)
# Correctness Test - commit_value should be visible
self.assertEquals(cursor.get_value(), commit_value)
# Correctness Test - prepare_value should NOT be visible
self.assertNotEquals(cursor.get_value(), prepare_value)
cursor.close()
# Close all cursors and sessions, this will cause prepared updates to be
# rollback-ed
for j in range (0, nsessions):
cursors[j].close()
sessions[j].close()
# Corrupt the table, Call salvage to recover data from the corrupted table and call verify
self.corrupt_salvage_verify()
self.session.commit_transaction()
self.session.checkpoint()
# Corrupt the table, Call salvage to recover data from the corrupted table and call verify
self.corrupt_salvage_verify()
# Finally, search for the keys inserted with commit timestamp
cursor = self.session.open_cursor(self.uri)
self.pr('Read Keys')
self.session.begin_transaction('read_timestamp=' + timestamp_str(4))
for i in range(1, nkeys):
cursor.set_key(ds.key(nrows + i))
# The search should pass
self.assertEqual(cursor.search(), 0)
# Correctness Test - commit_value should be visible
self.assertEquals(cursor.get_value(), commit_value)
cursor.close()
self.session.commit_transaction()
self.session.checkpoint()
# Simulate a crash by copying to a new directory(RESTART).
copy_wiredtiger_home(".", "RESTART")
# Open the new directory.
self.conn = self.setUpConnectionOpen("RESTART")
self.session = self.setUpSessionOpen(self.conn)
cursor = self.session.open_cursor(self.uri)
# Search the keys inserted with commit timestamp after crash
self.session.begin_transaction('read_timestamp=' + timestamp_str(4))
for i in range(1, nkeys):
cursor.set_key(ds.key(nrows + i))
# The search should pass
self.assertEqual(cursor.search(), 0)
# Correctness Test - commit_value should be visible
self.assertEquals(cursor.get_value(), commit_value)
# Correctness Test - prepare_value should NOT be visible
self.assertNotEquals(cursor.get_value(), prepare_value)
cursor.close()
self.session.commit_transaction()
# After simulating a crash, corrupt the table, call salvage to recover data from the corrupted table
# and call verify
self.corrupt_salvage_verify()
@unittest.skip("Temporarily disabled")
def test_prepare_hs(self):
nrows = 100
ds = SimpleDataSet(self, self.uri, nrows, key_format="S", value_format='u')
ds.populate()
bigvalue = b"aaaaa" * 100
# Initially load huge data
cursor = self.session.open_cursor(self.uri)
for i in range(1, 10000):
cursor.set_key(ds.key(nrows + i))
cursor.set_value(bigvalue)
self.assertEquals(cursor.insert(), 0)
cursor.close()
self.session.checkpoint()
# We put prepared updates in multiple sessions so that we do not hang
# because of cache being full with uncommitted updates.
nsessions = 3
nkeys = 4000
self.prepare_updates(ds, nrows, nsessions, nkeys)
if __name__ == '__main__':
wttest.run()
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