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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.
from test_gc01 import test_gc_base
from wtdataset import SimpleDataSet
# test_gc05.py
# Verify a locked checkpoint is not removed during garbage collection.
class test_gc05(test_gc_base):
conn_config = 'cache_size=50MB,log=(enabled),statistics=(all)'
session_config = 'isolation=snapshot'
def test_gc(self):
uri = "table:gc05"
create_params = 'value_format=S,key_format=i'
self.session.create(uri, create_params)
nrows = 10000
value_x = "xxxxx" * 100
value_y = "yyyyy" * 100
value_z = "zzzzz" * 100
ds = SimpleDataSet(
self, uri, 0, key_format="i", value_format="S", config='log=(enabled=false)')
ds.populate()
# Set the oldest and stable timestamps to 10.
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(10) +
',stable_timestamp=' + self.timestamp_str(10))
# Insert values with varying timestamps.
self.large_updates(uri, value_x, ds, nrows, 20)
self.large_updates(uri, value_y, ds, nrows, 30)
self.large_updates(uri, value_z, ds, nrows, 40)
# Perform a checkpoint.
self.session.checkpoint("name=checkpoint_one")
# Check statistics.
self.check_gc_stats()
# Open a cursor to the checkpoint just performed.
ckpt_cursor = self.session.open_cursor(uri, None, "checkpoint=checkpoint_one")
# Move the oldest and stable timestamps to 40.
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(40) +
',stable_timestamp=' + self.timestamp_str(40))
# Insert values with varying timestamps.
self.large_updates(uri, value_z, ds, nrows, 50)
self.large_updates(uri, value_y, ds, nrows, 60)
self.large_updates(uri, value_x, ds, nrows, 70)
# Move the oldest and stable timestamps to 70.
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(70) +
',stable_timestamp=' + self.timestamp_str(70))
# Perform a checkpoint.
self.session.checkpoint()
self.check_gc_stats()
# Verify checkpoint_one still exists and contains the expected values.
for i in range(0, nrows):
ckpt_cursor.set_key(i)
ckpt_cursor.search()
self.assertEqual(value_z, ckpt_cursor.get_value())
# Close checkpoint cursor.
ckpt_cursor.close()
if __name__ == '__main__':
wttest.run()
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