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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.
import threading, time, wiredtiger
import glob, os, shutil
from wtbackup import backup_base
from wtdataset import SimpleDataSet, simple_key
from wtscenario import make_scenarios
from wtthread import op_thread
# test_backup04.py
# Utilities: wt backup
# Test incremental cursor backup.
class test_backup_target(backup_base):
dir='backup.dir' # Backup directory name
logmax="100K"
# This test is written to test incremental backups. We want to add
# enough data to generate more than one log file each time we add data.
# First we populate and take a full backup. Then we loop, checkpointing
# running an incremental backup with a targeted cursor and then calling
# truncate to archive the logs.
#
# At the same time, we take a full backup during each loop.
# We run recovery and verify the full backup with the incremental
# backup after each loop. We compare two backups instead of the original
# because running 'wt' causes all of our original handles to be closed
# and that is not what we want here.
#
pfx = 'test_backup'
scenarios = make_scenarios([
('table', dict(uri='table:test',dsize=100,nops=2000,nthreads=1,time=30)),
])
# Create a large cache, otherwise this test runs quite slowly.
def conn_config(self):
return 'cache_size=1G,log=(archive=false,enabled,file_max=%s)' % \
self.logmax
def populate_with_string(self, uri, dsize, rows):
self.pr('populate: ' + uri + ' with ' + str(rows) + ' rows')
cursor = self.session.open_cursor(uri, None)
for i in range(1, rows + 1):
cursor[simple_key(cursor, i)] = str(i) + ':' + 'a' * dsize
cursor.close()
def update(self, uri, dsize, upd, rows):
self.pr('update: ' + uri + ' with ' + str(rows) + ' rows')
cursor = self.session.open_cursor(uri, None)
for i in range(1, rows + 1):
cursor[simple_key(cursor, i)] = str(i) + ':' + upd * dsize
cursor.close()
def take_full_backup(self, dir):
# Open up the backup cursor, and copy the files. Do a full backup.
cursor = self.session.open_cursor('backup:', None, None)
self.pr('Full backup to ' + dir + ': ')
os.mkdir(dir)
while True:
ret = cursor.next()
if ret != 0:
break
newfile = cursor.get_key()
sz = os.path.getsize(newfile)
self.pr('Copy from: ' + newfile + ' (' + str(sz) + ') to ' + dir)
shutil.copy(newfile, dir)
self.assertEqual(ret, wiredtiger.WT_NOTFOUND)
cursor.close()
# Take an incremental backup and then truncate/archive the logs.
def take_incr_backup(self, dir):
config = 'target=("log:")'
cursor = self.session.open_cursor('backup:', None, config)
while True:
ret = cursor.next()
if ret != 0:
break
newfile = cursor.get_key()
sz = os.path.getsize(newfile)
self.pr('Copy from: ' + newfile + ' (' + str(sz) + ') to ' + dir)
shutil.copy(newfile, dir)
self.assertEqual(ret, wiredtiger.WT_NOTFOUND)
self.session.truncate('log:', cursor, None, None)
cursor.close()
# Run background inserts while running checkpoints and incremental backups
# repeatedly.
def test_incremental_backup(self):
import sys
# Create the backup directory.
self.session.create(self.uri, "key_format=S,value_format=S")
self.populate_with_string(self.uri, self.dsize, self.nops)
# We need to start the directory for the incremental backup with
# a full backup. The full backup function creates the directory.
dir = self.dir
self.take_full_backup(dir)
self.session.checkpoint(None)
#
# Incremental backups perform a loop:
# Do more work
# Checkpoint
# Copy log files returned by log targeted backup cursor
# Truncate (archive) the log files
# Close the backup cursor
updstr="bcdefghi"
for increment in range(0, 5):
# Add more work to move the logs forward.
self.update(self.uri, self.dsize, updstr[increment], self.nops)
self.session.checkpoint(None)
self.pr('Iteration: ' + str(increment))
self.take_incr_backup(self.dir)
# After running, take a full backup. Compare the incremental
# backup to the original database and the full backup database.
full_dir = self.dir + ".full"
self.take_full_backup(full_dir)
self.compare_backups(self.uri, self.dir, full_dir)
self.compare_backups(self.uri, self.dir, './')
if __name__ == '__main__':
wttest.run()
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