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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.
#
# test_backup05.py
# Test that backups can be performed similar to MongoDB's fsyncLock.
# We assume writes are not being performed, a checkpoint is done and
# then we open a backup cursor to prevent log removal and other file
# manipulations. Manually copy the directory and verify it.
#
import os
from suite_subprocess import suite_subprocess
from helper import copy_wiredtiger_home
import wiredtiger, wttest
class test_backup05(wttest.WiredTigerTestCase, suite_subprocess):
uri = 'table:test_backup05'
emptyuri = 'table:test_empty05'
newuri = 'table:test_new05'
create_params = 'key_format=i,value_format=i'
freq = 5
def check_manual_backup(self, i, olddir, newdir):
''' Simulate a manual backup from olddir and restart in newdir. '''
self.session.checkpoint()
cbkup = self.session.open_cursor('backup:', None, None)
# With the connection still open, copy files to new directory.
# Half the time use an unaligned copy.
even = i % (self.freq * 2) == 0
aligned = even or os.name == "nt"
copy_wiredtiger_home(self, olddir, newdir, aligned)
# Half the time try to rename a table and the other half try
# to remove a table. They should fail.
if not even:
self.assertRaises(wiredtiger.WiredTigerError,
lambda: self.session.rename(
self.emptyuri, self.newuri, None))
else:
self.assertRaises(wiredtiger.WiredTigerError,
lambda: self.session.drop(self.emptyuri, None))
# Now simulate fsyncUnlock by closing the backup cursor.
cbkup.close()
# Once the backup cursor is closed we should be able to perform
# schema operations. Test that and then reset the files to their
# expected initial names.
if not even:
self.session.rename(self.emptyuri, self.newuri, None)
self.session.drop(self.newuri, None)
self.session.create(self.emptyuri, self.create_params)
else:
self.session.drop(self.emptyuri, None)
self.session.create(self.emptyuri, self.create_params)
# Open the new directory and verify
conn = self.setUpConnectionOpen(newdir)
session = self.setUpSessionOpen(conn)
session.verify(self.uri)
conn.close()
def backup(self):
'''Check manual fsyncLock backup strategy'''
# Here's the strategy:
# - update the table
# - checkpoint the database
# - open a backup cursor
# - copy the database directory (live, simulating a crash)
# - use copy tree or non-aligned dd
# - verify in the copy
# - repeat
#
# If the metadata isn't flushed, eventually the metadata we copy will
# be sufficiently out-of-sync with the data file that it won't verify.
self.session.create(self.emptyuri, self.create_params)
self.reopen_conn()
self.session.create(self.uri, self.create_params)
for i in range(100):
c = self.session.open_cursor(self.uri)
c[i] = i
c.close()
if i % self.freq == 0:
self.check_manual_backup(i, ".", "RESTART")
else:
self.verifyUntilSuccess(self.session, self.uri)
def test_backup(self):
with self.expectedStdoutPattern('recreating metadata'):
self.backup()
if __name__ == '__main__':
wttest.run()
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