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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 wiredtiger import stat
from wtdataset import SimpleDataSet
def timestamp_str(t):
return '%x' % t
# test_gc03.py
# Test that checkpoint cleans the obsolete history store pages that are in-memory.
class test_gc03(test_gc_base):
conn_config = 'cache_size=4GB,log=(enabled),statistics=(all),statistics_log=(wait=0,on_close=true)'
session_config = 'isolation=snapshot'
def get_stat(self, stat):
stat_cursor = self.session.open_cursor('statistics:')
val = stat_cursor[stat][2]
stat_cursor.close()
return val
def test_gc(self):
nrows = 10000
# Create a table without logging.
uri = "table:gc03"
ds = SimpleDataSet(
self, uri, 0, key_format="i", value_format="S", config='log=(enabled=false)')
ds.populate()
# Create an extra table without logging.
uri_extra = "table:gc03_extra"
ds_extra = SimpleDataSet(
self, uri_extra, 0, key_format="i", value_format="S", config='log=(enabled=false)')
ds_extra.populate()
# Pin oldest and stable to timestamp 1.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1) +
',stable_timestamp=' + timestamp_str(1))
bigvalue = "aaaaa" * 100
bigvalue2 = "ddddd" * 100
self.large_updates(uri, bigvalue, ds, nrows, 10)
# Check that all updates are seen.
self.check(bigvalue, uri, nrows, 10)
self.large_updates(uri, bigvalue2, ds, nrows, 100)
# Check that the new updates are only seen after the update timestamp.
self.check(bigvalue2, uri, nrows, 100)
# Check that old updates are seen.
self.check(bigvalue, uri, nrows, 10)
# Checkpoint to ensure that the history store is populated.
self.session.checkpoint()
self.assertGreater(self.get_stat(stat.conn.cc_pages_visited), 0)
# Pin oldest and stable to timestamp 100.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(100) +
',stable_timestamp=' + timestamp_str(100))
# Check that the new updates are only seen after the update timestamp.
self.check(bigvalue2, uri, nrows, 100)
# Load a slight modification with a later timestamp.
self.large_modifies(uri, 'A', ds, 10, 1, nrows, 110)
self.large_modifies(uri, 'B', ds, 20, 1, nrows, 120)
self.large_modifies(uri, 'C', ds, 30, 1, nrows, 130)
# Second set of update operations with increased timestamp.
self.large_updates(uri, bigvalue, ds, nrows, 200)
# Check that the new updates are only seen after the update timestamp.
self.check(bigvalue, uri, nrows, 200)
# Check that the modifies are seen.
bigvalue_modA = bigvalue2[0:10] + 'A' + bigvalue2[11:]
bigvalue_modB = bigvalue_modA[0:20] + 'B' + bigvalue_modA[21:]
bigvalue_modC = bigvalue_modB[0:30] + 'C' + bigvalue_modB[31:]
self.check(bigvalue_modA, uri, nrows, 110)
self.check(bigvalue_modB, uri, nrows, 120)
self.check(bigvalue_modC, uri, nrows, 130)
# Check that old updates are seen.
self.check(bigvalue2, uri, nrows, 100)
# Pin oldest and stable to timestamp 200.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(200) +
',stable_timestamp=' + timestamp_str(200))
# Update on extra table.
self.large_updates(uri_extra, bigvalue, ds_extra, 100, 210)
self.large_updates(uri_extra, bigvalue2, ds_extra, 100, 220)
# Checkpoint to ensure that the history store is populated and added for eviction.
self.session.checkpoint()
self.assertGreater(self.get_stat(stat.conn.cc_pages_evict), 0)
self.assertGreater(self.get_stat(stat.conn.cc_pages_visited), 0)
# Check that the new updates are only seen after the update timestamp.
self.check(bigvalue, uri, nrows, 200)
# Pin oldest and stable to timestamp 300.
self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(300) +
',stable_timestamp=' + timestamp_str(300))
self.large_updates(uri_extra, bigvalue, ds_extra, 100, 310)
self.large_updates(uri_extra, bigvalue2, ds_extra, 100, 320)
# Checkpoint to ensure that the normal table history store gets cleaned.
self.session.checkpoint()
self.check_gc_stats()
# Check that the new updates are only seen after the update timestamp.
self.check(bigvalue, uri, nrows, 300)
if __name__ == '__main__':
wttest.run()
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