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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_nsnap03.py
# Named snapshots: Access and create from multiple sessions
from suite_subprocess import suite_subprocess
from helper import simple_populate
import wiredtiger, wttest
class test_nsnap03(wttest.WiredTigerTestCase, suite_subprocess):
tablename = 'test_nsnap03'
uri = 'table:' + tablename
nrows = 300
nrows_per_snap = 10
nsnapshots = 10
def check_named_snapshot(self, snapshot, expected):
new_session = self.conn.open_session()
new_session.begin_transaction("snapshot=" + str(snapshot))
c = new_session.open_cursor(self.uri)
count = 0
for row in c:
count += 1
new_session.commit_transaction()
# print "Checking snapshot %d, expect %d, found %d" % (snapshot, expected, count)
self.assertEqual(count, expected)
new_session.close()
def test_named_snapshots(self):
# Populate a table
end = start = 0
simple_populate(self, self.uri, 'key_format=i', 0)
# Now run a workload:
# every iteration:
# create a new named snapshot, N
# append 20 rows and delete the first 10
# verify that every snapshot N contains the expected number of rows
# if there are more than 10 snapshots active, drop the first half
snapshots = []
c = self.session.open_cursor(self.uri)
for n in xrange(self.nrows / self.nrows_per_snap):
if len(snapshots) > self.nsnapshots:
middle = len(snapshots) / 2
dropcfg = ",drop=(to=%d)" % snapshots[middle][0]
snapshots = snapshots[middle + 1:]
else:
dropcfg = ""
# Close and start a new session every three snapshots
if n % 3 == 0:
self.session.close()
self.session = self.conn.open_session()
c = self.session.open_cursor(self.uri)
self.session.snapshot("name=%d%s" % (n, dropcfg))
snapshots.append((n, end - start))
for i in xrange(2 * self.nrows_per_snap):
c[end + i] = "some value"
end += 2 * self.nrows_per_snap
for i in xrange(self.nrows_per_snap):
del c[start + i]
start += self.nrows_per_snap
for snapshot, expected in snapshots:
self.check_named_snapshot(snapshot, expected)
if __name__ == '__main__':
wttest.run()
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