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#!/usr/bin/env python
#
# Public Domain 2014-2017 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
import wiredtiger, wttest
from wtdataset import simple_key
from wtscenario import make_scenarios
# test_empty.py
# Test that empty objects don't write anything other than a single sector.
class test_empty(wttest.WiredTigerTestCase):
name = 'test_empty'
scenarios = make_scenarios([
('file-r', dict(type='file:', fmt='r')),
('file-S', dict(type='file:', fmt='S')),
('table-r', dict(type='table:', fmt='r')),
('table-S', dict(type='table:', fmt='S'))
])
# Creating an object and then closing it shouldn't write any blocks.
def test_empty_create(self):
uri = self.type + self.name
self.session.create(uri, 'key_format=' + self.fmt)
self.session.close()
name = self.name
if self.type == "table:":
name = name + '.wt'
self.assertEquals(os.stat(name).st_size, 4*1024)
# Open a new session, add a few rows to an object and then remove them,
# then close the object. We open/close the object so it's flushed from
# the underlying cache each time.
def empty(self):
uri = self.type + self.name
self.session = self.conn.open_session()
self.session.create(uri, 'key_format=' + self.fmt)
# Add a few records to the object and remove them.
cursor = self.session.open_cursor(uri, None, None)
for i in range(1,5):
key = simple_key(cursor, i)
cursor[key] = "XXX"
del cursor[key]
# Perform a checkpoint (we shouldn't write any underlying pages because
# of a checkpoint, either).
self.session.checkpoint("name=ckpt")
# Open and close a checkpoint cursor.
cursor = self.session.open_cursor(uri, None, "checkpoint=ckpt")
cursor.close()
self.session.close()
# The file should not have grown.
name = self.name
if self.type == "table:":
name = name + '.wt'
self.assertEquals(os.stat(name).st_size, 4*1024)
# Creating an object, inserting and removing records (that is, building an
# empty, dirty tree), shouldn't write any blocks. This doesn't work for
# column-store objects, though, because deleting an object modifies the name
# space, which requires a write.
def test_empty(self):
if self.fmt == 'r':
return
for i in range(1,5):
self.empty()
if __name__ == '__main__':
wttest.run()
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