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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, wttest, suite_random
from wiredtiger import stat
from wtdataset import SimpleDataSet
from wtscenario import make_scenarios
# test_truncate19.py
#
# Test to mimic oplog workload in MongoDB. Ensure the deleted pages are
# cleaned up on disk and we are not using excessive disk space.
class test_truncate19(wttest.WiredTigerTestCase):
conn_config = 'statistics=(all)'
format_values = [
('string_row', dict(key_format='S', value_format='S')),
]
scenarios = make_scenarios(format_values)
def append_rows(self, uri, ds, start_row, nrows, value):
cursor = self.session.open_cursor(uri)
self.session.begin_transaction()
for i in range(start_row, start_row + nrows + 1):
cursor[ds.key(i)] = value
if i % 2 == 0:
self.session.commit_transaction()
self.session.begin_transaction()
self.session.commit_transaction()
cursor.close()
def do_truncate(self, ds, start_row, nrows):
self.session.begin_transaction()
hicursor = self.session.open_cursor(ds.uri)
hicursor.set_key(ds.key(start_row + nrows))
self.session.truncate(None, None, hicursor, None)
self.session.commit_transaction()
def test_truncate19(self):
uri = 'table:oplog'
nrows = 1000000
# Create a table.
ds = SimpleDataSet(self, uri, 0, key_format=self.key_format, value_format=self.value_format)
ds.populate()
ds_dummy = SimpleDataSet(self, 'table:dummy', 0, key_format=self.key_format, value_format=self.value_format)
ds_dummy.populate()
value_a = "aaaaa" * 100
# Write some data
self.append_rows(uri, ds, 1, nrows, value_a)
self.session.checkpoint()
# Reopen the database.
self.reopen_conn()
# Session for checkpoint
session2 = self.conn.open_session()
# Session for long running transaction, to make truncate not globally visible
session3 = self.conn.open_session()
trunc_rows = 0
start_num = 1
end_num = nrows
for i in range(1, 50):
# Start a long running transaction
session3.begin_transaction()
trunc_rows = 10000
self.do_truncate(ds, start_num, trunc_rows)
# Check stats to make sure we fast-deleted at least one page.
stat_cursor = self.session.open_cursor('statistics:', None, None)
fastdelete_pages = stat_cursor[stat.conn.rec_page_delete_fast][2]
self.assertGreater(fastdelete_pages, 0)
# Take a checkpoint.
session2.checkpoint()
# Ensure the datasize is smaller than 600M
self.assertGreater(600000000, os.path.getsize("oplog.wt"))
session3.rollback_transaction()
self.append_rows(uri, ds, end_num, trunc_rows, value_a)
end_num = end_num + trunc_rows
start_num = start_num + trunc_rows
session2.checkpoint()
# Ensure the datasize is smaller than 600M
self.assertGreater(600000000, os.path.getsize("oplog.wt"))
if __name__ == '__main__':
wttest.run()
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