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#!/usr/bin/env python
#
# Public Domain 2014-2016 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_truncate02.py
# session level operations on tables
#
import wiredtiger, wttest
from wtdataset import SimpleDataSet
from wtscenario import make_scenarios
# test_truncate_fast_delete
# When deleting leaf pages that aren't in memory, we set transactional
# information in the page's WT_REF structure, which results in interesting
# issues.
class test_truncate_fast_delete(wttest.WiredTigerTestCase):
name = 'test_truncate'
nentries = 10000
# Use a small page size and lots of keys because we want to create lots
# of individual pages in the file.
types = [
('file', dict(type='file:', config=\
'allocation_size=512,leaf_page_max=512')),
]
# This is all about testing the btree layer, not the schema layer, test
# files and ignore tables.
keyfmt = [
('integer', dict(keyfmt='i')),
('recno', dict(keyfmt='r')),
('string', dict(keyfmt='S')),
]
# Overflow records force pages to be instantiated, blocking fast delete.
overflow = [
('ovfl1', dict(overflow=False)),
('ovfl2', dict(overflow=True)),
]
# Random reads and writes force pages to be instantiated and potentially
# create update structures, blocking fast delete and changing how fast
# delete rollback works.
reads = [
('read1', dict(readafter=False,readbefore=False)),
('read2', dict(readafter=True,readbefore=False)),
('read3', dict(readafter=False,readbefore=True)),
('read4', dict(readafter=True,readbefore=True)),
]
writes = [
('write1', dict(writeafter=False,writebefore=False)),
('write2', dict(writeafter=True,writebefore=False)),
('write3', dict(writeafter=False,writebefore=True)),
('write4', dict(writeafter=True,writebefore=True)),
]
# Test both commit and abort of the truncate transaction.
txn = [
('txn1', dict(commit=True)),
('txn2', dict(commit=False)),
]
scenarios = make_scenarios(types, keyfmt, overflow, reads, writes, txn,
prune=20, prunelong=1000)
# Return the number of records visible to the cursor; test both forward
# and backward iteration, they are different code paths in this case.
def cursor_count(self, cursor, expected):
count = 0
while cursor.next() == 0:
count += 1
self.assertEqual(count, expected)
cursor.reset()
count = 0
while cursor.prev() == 0:
count += 1
self.assertEqual(count, expected)
# Open a cursor in a new session and confirm how many records it sees.
def outside_count(self, isolation, expected):
s = self.conn.open_session()
s.begin_transaction(isolation)
cursor = s.open_cursor(self.type + self.name, None)
self.cursor_count(cursor, expected)
s.close()
# Trigger fast delete and test cursor counts.
def test_truncate_fast_delete(self):
uri = self.type + self.name
'''
print '===== run:'
print 'config:', self.config + self.keyfmt, \
'overflow=', self.overflow, \
'readafter=', self.readafter, 'readbefore=', self.readbefore, \
'writeafter=', self.writeafter, 'writebefore=', self.writebefore, \
'commit=', self.commit
'''
# Create the object.
ds = SimpleDataSet(self, uri, self.nentries,
config=self.config, key_format=self.keyfmt)
ds.populate()
# Optionally add a few overflow records so we block fast delete on
# those pages.
if self.overflow:
cursor = self.session.open_cursor(uri, None, 'overwrite=false')
for i in range(1, self.nentries, 3123):
cursor.set_key(ds.key(i))
cursor.set_value(ds.value(i))
cursor.update()
cursor.close()
# Close and re-open it so we get a disk image, not an insert skiplist.
self.reopen_conn()
# Optionally read/write a few rows before truncation.
if self.readbefore or self.writebefore:
cursor = self.session.open_cursor(uri, None, 'overwrite=false')
if self.readbefore:
for i in range(1, self.nentries, 737):
cursor.set_key(ds.key(i))
cursor.search()
if self.writebefore:
for i in range(1, self.nentries, 988):
cursor.set_key(ds.key(i))
cursor.set_value(ds.value(i + 100))
cursor.update()
cursor.close()
# Begin a transaction, and truncate a big range of rows.
self.session.begin_transaction(None)
start = self.session.open_cursor(uri, None)
start.set_key(ds.key(10))
end = self.session.open_cursor(uri, None)
end.set_key(ds.key(self.nentries - 10))
self.session.truncate(None, start, end, None)
start.close()
end.close()
# Optionally read/write a few rows after truncation.
if self.readafter or self.writeafter:
cursor = self.session.open_cursor(uri, None, 'overwrite=false')
if self.readafter:
for i in range(1, self.nentries, 1123):
cursor.set_key(ds.key(i))
cursor.search()
if self.writeafter:
for i in range(1, self.nentries, 621):
cursor.set_key(ds.key(i))
cursor.set_value(ds.value(i + 100))
cursor.update()
cursor.close()
# A cursor involved in the transaction should see the deleted records.
# The number 19 comes from deleting row 10 (inclusive), to row N - 10,
# exclusive, or 9 + 10 == 19.
remaining = 19
cursor = self.session.open_cursor(uri, None)
self.cursor_count(cursor, remaining)
cursor.close()
# A separate, read_committed cursor should not see the deleted records.
self.outside_count("isolation=read-committed", self.nentries)
# A separate, read_uncommitted cursor should see the deleted records.
self.outside_count("isolation=read-uncommitted", remaining)
# Commit/rollback the transaction.
if self.commit:
self.session.commit_transaction()
else:
self.session.rollback_transaction()
# Check a read_committed cursor sees the right records.
cursor = self.session.open_cursor(uri, None)
if self.commit:
self.cursor_count(cursor, remaining)
else:
self.cursor_count(cursor, self.nentries)
cursor.close()
if __name__ == '__main__':
wttest.run()
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