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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_import08.py
# Check that transaction ids from imported files are ignored regardless of write generation.
import os, re, shutil
from test_import01 import test_import_base
from wtscenario import make_scenarios
class test_import08(test_import_base):
conn_config = 'cache_size=50MB,log=(enabled)'
session_config = 'isolation=snapshot'
original_db_file = 'original_db_file'
uri = 'file:' + original_db_file
nrows = 100
ntables = 10
keys = [b'1', b'2', b'3', b'4', b'5', b'6']
values = [b'\x01\x02aaa\x03\x04', b'\x01\x02bbb\x03\x04', b'\x01\x02ccc\x03\x04',
b'\x01\x02ddd\x03\x04', b'\x01\x02eee\x03\x04', b'\x01\x02fff\x03\x04']
ts = [10*k for k in range(1, len(keys)+1)]
create_config = 'allocation_size=512,key_format=u,log=(enabled=true),value_format=u'
scenarios = make_scenarios([
('file_metadata', dict(repair=False)),
('repair', dict(repair=True)),
])
def parse_write_gen(self, config):
# The search string will look like: 'write_gen=<num>'.
# Just reverse the string and take the digits from the back until we hit '='.
write_gen = re.search("write_gen=\d+", config)
self.assertTrue(write_gen is not None)
write_gen_str = str()
for c in reversed(write_gen.group(0)):
if not c.isdigit():
self.assertEqual(c, '=')
break
write_gen_str = c + write_gen_str
return int(write_gen_str)
def test_import_write_gen(self):
# Make a bunch of files and fill them with data. This has the side effect of allocating a
# lot of transaction ids which is important for our test.
self.populate(self.ntables, self.nrows)
# Find the URI of one of the generated tables.
session2 = self.conn.open_session()
cursor2 = session2.open_cursor('metadata:')
generated_uri = None
for k, _ in cursor2:
if k.startswith('table:'):
generated_uri = k
break
cursor2.close()
# Now begin a transaction and remove the first entry in the table.
#
# This is going to allocate a transaction ID and more importantly, will ensure that pinned
# ID is set for subsequent checkpoints in this test. If we don't do this, reconciliation
# won't actually write transaction IDs to the disk since they will be deemed obsolete.
session2.begin_transaction()
self.assertTrue(generated_uri is not None)
cursor2 = session2.open_cursor(generated_uri)
cursor2.set_key(0)
cursor2.remove()
# Now create the file that we'll be importing later.
self.session.create(self.uri, self.create_config)
# Insert records into our newly created file.
#
# Since we allocated a bunch of transaction IDs before, we'll be allocating pretty high
# IDs at this point.
for i in range(0, len(self.keys)):
self.update(self.uri, self.keys[i], self.values[i], self.ts[i])
# We want to checkpoint after each write to increase the write gen for this particular
# btree.
self.session.checkpoint()
# Export the metadata for the table.
c = self.session.open_cursor('metadata:', None, None)
original_db_file_config = c[self.uri]
c.close()
self.printVerbose(3, '\nFile configuration:\n' + original_db_file_config)
# Now that we've finished doing our checkpoints, we can let go of the transaction ID we
# allocated earlier.
session2.rollback_transaction()
# Close the connection.
self.close_conn()
# Create a new database and connect to it.
newdir = 'IMPORT_DB'
shutil.rmtree(newdir, ignore_errors=True)
os.mkdir(newdir)
self.conn = self.setUpConnectionOpen(newdir)
self.session = self.setUpSessionOpen(self.conn)
# Bring forward the oldest to be past or equal to the timestamps we'll be importing.
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(self.ts[-1]))
# Copy over the datafiles for the object we want to import.
self.copy_file(self.original_db_file, '.', newdir)
# Contruct the config string.
if self.repair:
import_config = 'import=(enabled,repair=true)'
else:
import_config = 'import=(enabled,repair=false,file_metadata=(' + \
original_db_file_config + '))'
# Import the file.
self.session.create(self.uri, import_config)
# Verify object.
self.session.verify(self.uri)
# Check the write generation of the new table.
#
# The important thing to check is that it is greater than 1 (the current connection-wide
# base write gen).
c = self.session.open_cursor('metadata:')
original_db_file_config = c[self.uri]
c.close()
write_gen = self.parse_write_gen(original_db_file_config)
self.printVerbose(3, 'IMPORTED WRITE GEN: {}'.format(write_gen))
self.assertGreater(write_gen, 1)
# Check that the values are all visible.
#
# These values were written in the previous database with HIGH transaction IDs. Since we're
# on a fresh connection, our IDs are starting back from 1 so we MUST wipe the IDs otherwise
# they won't be visible to us and this test will fail.
#
# Since we were checkpointing after each write, the write gen of some of these pages will
# definitely be higher than 1.
#
# If we use the old scheme and compare the page's write gen with the connection-wide base
# write gen (which will be 1 since we made a new database), then we won't see some records
# and the test will fail.
#
# If we use the new scheme and compare with the btree specific base write gen that was
# supplied in the metadata, we will realise that it was from the previous run and wipe the
# IDs meaning that all records will be visible.
self.check(self.uri, self.keys, self.values)
# Perform a checkpoint.
self.session.checkpoint()
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