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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 os, re
from wtscenario import make_scenarios
from wtbackup import backup_base
# test_backup29.py
# Test interaction between restart, checkpoint and incremental backup. There was a bug in
# maintaining the incremental backup bitmaps correctly across restarts in specific conditions
# that this test can reproduce.
#
class test_backup29(backup_base):
create_config = 'allocation_size=512,key_format=i,value_format=S'
# Backup directory name
dir='backup.dir'
uri = 'test_backup29'
uri2 = 'test_other'
value_base = '-abcdefghijkl'
few = 100
nentries = 5000
def parse_blkmods(self, uri):
meta_cursor = self.session.open_cursor('metadata:')
config = meta_cursor[uri]
meta_cursor.close()
# The search string looks like: ,blocks=feffff1f000000000000000000000000
# Obtain just the hex string.
b = re.search(',blocks=(\w+)', config)
self.assertTrue(b is not None)
# The bitmap string after the = is in group 1.
blocks = b.group(1)
self.pr("block bitmap: " + blocks)
return blocks
def test_backup29(self):
os.mkdir(self.dir)
# Create and populate the table.
file_uri = 'file:' + self.uri + '.wt'
file2_uri = 'file:' + self.uri2 + '.wt'
table_uri = 'table:' + self.uri
table2_uri = 'table:' + self.uri2
self.session.create(table_uri, self.create_config)
self.session.create(table2_uri, self.create_config)
c = self.session.open_cursor(table_uri)
c2 = self.session.open_cursor(table2_uri)
# Only add a few entries.
self.pr("Write: " + str(self.few) + " initial data items")
for i in range(1, self.few):
val = str(i) + self.value_base
c[i] = val
c2[i] = val
self.session.checkpoint()
# Take the initial full backup for incremental.
config = 'incremental=(enabled,granularity=4k,this_id="ID1")'
bkup_c = self.session.open_cursor('backup:', None, config)
self.take_full_backup(self.dir, bkup_c)
bkup_c.close()
# Add a lot more data to both tables to generate a filled in block mod bitmap.
last_i = self.few
self.pr("Write: " + str(self.nentries) + " additional data items")
for i in range(self.few, self.nentries):
val = str(i) + self.value_base
c[i] = val
c2[i] = val
last_i = self.nentries
c.close()
c2.close()
self.session.checkpoint()
# Get the block mod bitmap from the file URI.
orig_bitmap = self.parse_blkmods(file2_uri)
self.pr("CLOSE and REOPEN conn")
self.reopen_conn()
self.pr("Reopened conn")
# After reopening we want to open both tables, but only modify one of them for
# the first checkpoint. Then modify the other table, checkpoint, and then check the
# that the block mod bitmap remains correct for the other table.
c = self.session.open_cursor(table_uri)
c2 = self.session.open_cursor(table2_uri)
# Change one table and checkpoint. Keep the other table clean.
self.pr("Update only table 1: " + str(last_i))
val = str(last_i) + self.value_base
c[last_i] = val
self.session.checkpoint()
# Now change the other table and checkpoint again.
self.pr("Update second table: " + str(last_i))
c2[last_i] = val
self.session.checkpoint()
new_bitmap = self.parse_blkmods(file2_uri)
c.close()
c2.close()
# Compare the bitmaps from the metadata. Once a bit is set, it should never
# be cleared. But new bits could be set. So the check is only: if the original
# bitmap has a bit set then the current bitmap must be set for that bit also.
#
# First convert both bitmaps to a binary string, accounting for any possible leading
# zeroes (that would be truncated off). Then compare bit by bit.
orig_bits = bin(int('1'+orig_bitmap, 16))[3:]
new_bits = bin(int('1'+new_bitmap, 16))[3:]
self.pr("Original bitmap in binary: " + orig_bits)
self.pr("Reopened bitmap in binary: " + new_bits)
for orig, new in zip(orig_bits, new_bits):
if orig != '0':
self.assertTrue(new != '0')
if __name__ == '__main__':
wttest.run()
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