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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.
from helper import copy_wiredtiger_home
import wiredtiger, wttest
from wtdataset import SimpleDataSet
def timestamp_str(t):
return '%x' % t
# test_las.py
# Smoke tests to ensure lookaside tables are working.
class test_las(wttest.WiredTigerTestCase):
# Force a small cache.
def conn_config(self):
return 'cache_size=1GB'
def large_updates(self, session, uri, value, ds, nrows, timestamp=False):
# Insert a large number of records, we'll hang if the lookaside table
# isn't doing its thing.
cursor = session.open_cursor(uri)
for i in range(1, 1000000):
if timestamp == True:
session.begin_transaction()
cursor.set_key(ds.key(nrows + i))
cursor.set_value(value)
self.assertEquals(cursor.update(), 0)
if timestamp == True:
session.commit_transaction('commit_timestamp=' + timestamp_str(i + 1))
cursor.close()
def durable_check(self, check_value, uri, ds, nrows):
# Checkpoint and backup so as to simulate recovery
self.session.checkpoint()
newdir = "BACKUP"
copy_wiredtiger_home('.', newdir, True)
conn = self.setUpConnectionOpen(newdir)
session = self.setUpSessionOpen(conn)
cursor = session.open_cursor(uri, None)
# Skip the initial rows, which were not updated
for i in range(0, nrows+1):
self.assertEquals(cursor.next(), 0)
#print "Check value : " + str(check_value)
#print "value : " + str(cursor.get_value())
self.assertTrue(check_value == cursor.get_value())
cursor.close()
session.close()
conn.close()
@wttest.longtest('lookaside table smoke test')
def test_las(self):
# Create a small table.
uri = "table:test_las"
nrows = 100
ds = SimpleDataSet(self, uri, nrows, key_format="S")
ds.populate()
bigvalue = "aaaaa" * 100
# Initially load huge data
cursor = self.session.open_cursor(uri)
for i in range(1, 1000000):
cursor.set_key(ds.key(nrows + i))
cursor.set_value(bigvalue)
self.assertEquals(cursor.insert(), 0)
cursor.close()
self.session.checkpoint()
# Scenario: 1
# Check to see LAS working with old snapshot
bigvalue1 = "bbbbb" * 100
self.session.snapshot("name=xxx")
# Update the values in different session after snapshot
self.large_updates(self.session, uri, bigvalue1, ds, nrows)
# Check to see the value after recovery
self.durable_check(bigvalue1, uri, ds, nrows)
self.session.snapshot("drop=(all)")
# Scenario: 2
# Check to see LAS working with old reader
bigvalue2 = "ccccc" * 100
session2 = self.conn.open_session()
session2.begin_transaction('isolation=snapshot')
self.large_updates(self.session, uri, bigvalue2, ds, nrows)
# Check to see the value after recovery
self.durable_check(bigvalue2, uri, ds, nrows)
session2.rollback_transaction()
session2.close()
# Scenario: 3
# Check to see LAS working with old timestamp
bigvalue3 = "ddddd" * 100
self.conn.set_timestamp('stable_timestamp=' + timestamp_str(1))
self.large_updates(self.session, uri, bigvalue3, ds, nrows, timestamp=True)
# Check to see data can be see only till the stable_timestamp
self.durable_check(bigvalue2, uri, ds, nrows)
self.conn.set_timestamp('stable_timestamp=' + timestamp_str(i + 1))
# Check to see latest data can be seen
self.durable_check(bigvalue3, uri, ds, nrows)
if __name__ == '__main__':
wttest.run()
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