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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.
#
# test_checkpoint05.py
# Verify that we don't accumulate a lot of checkpoints while a backup
# cursor is open. WiredTiger checkpoints created after the backup cursor
# should get deleted as usual.
import time
import wttest
class test_checkpoint05(wttest.WiredTigerTestCase):
conn_config = 'create,cache_size=100MB,log=(enabled=true,file_max=100K,remove=false)'
def count_checkpoints(self):
metadata_cursor = self.session.open_cursor('metadata:', None, None)
nckpt = 0
while metadata_cursor.next() == 0:
key = metadata_cursor.get_key()
value = metadata_cursor[key]
nckpt += value.count("WiredTigerCheckpoint")
metadata_cursor.close()
return nckpt
def test_checkpoints_during_backup(self):
self.uri = 'table:ckpt05'
self.session.create(self.uri, 'key_format=i,value_format=i')
# Setup: Insert some data and checkpoint it
cursor = self.session.open_cursor(self.uri, None)
for i in range(16):
cursor[i] = i
self.session.checkpoint(None)
# Create backup and check how many checkpoints we have.
backup_cursor = self.session.open_cursor('backup:', None, None)
initial_count = self.count_checkpoints()
# Checkpoints created immediately after a backup cursor may get pinned.
# Pause to avoid this.
time.sleep(2)
# Take a bunch of checkpoints.
for i in range (50):
self.session.checkpoint('force=true')
cursor.close()
# There may be a few more checkpoints than when we opened the
# backup cursor, but not too many more. The factor of three
# is generous. But if WT isn't deleting checkpoints there would
# be about 30x more checkpoints here.
final_count = self.count_checkpoints()
self.assertTrue (final_count < initial_count * 3)
self.session.close()
if __name__ == '__main__':
wttest.run()
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