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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 helper import copy_wiredtiger_home
import wiredtiger, wttest
from wiredtiger import stat
from wtdataset import SimpleDataSet
from wtscenario import make_scenarios
# test_hs03.py
# Ensure checkpoints don't read too unnecessary history store entries.
class test_hs03(wttest.WiredTigerTestCase):
# Force a small cache.
conn_config = 'cache_size=50MB,statistics=(fast)'
session_config = 'isolation=snapshot'
key_format_values = [
('column', dict(key_format='r')),
('integer-row', dict(key_format='i')),
('string-row', dict(key_format='S'))
]
scenarios = make_scenarios(key_format_values)
def get_stat(self, stat):
stat_cursor = self.session.open_cursor('statistics:')
val = stat_cursor[stat][2]
stat_cursor.close()
return val
def large_updates(self, session, uri, value, ds, nrows, nops):
# Update a large number of records, we'll hang if the history store table
# isn't doing its thing.
cursor = session.open_cursor(uri)
for i in range(nrows + 1, nrows + nops + 1):
session.begin_transaction()
cursor[ds.key(i)] = value
session.commit_transaction('commit_timestamp=' + self.timestamp_str(i))
cursor.close()
def test_checkpoint_hs_reads(self):
# Create a small table.
uri = "table:test_hs03"
nrows = 100
ds = SimpleDataSet(self, uri, nrows, key_format=self.key_format, value_format='u')
ds.populate()
bigvalue = b"aaaaa" * 100
# Initially load huge data.
cursor = self.session.open_cursor(uri)
for i in range(1, 10000):
cursor[ds.key(nrows + i)] = bigvalue
cursor.close()
self.session.checkpoint()
# Check to see the history store working with old timestamp.
bigvalue2 = b"ddddd" * 100
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(1))
hs_writes_start = self.get_stat(stat.conn.cache_write_hs)
self.large_updates(self.session, uri, bigvalue2, ds, nrows, 10000)
# If the test sizing is correct, the history will overflow the cache.
self.session.checkpoint()
hs_writes = self.get_stat(stat.conn.cache_write_hs) - hs_writes_start
self.assertGreaterEqual(hs_writes, 0)
for ts in range(2, 4):
self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(ts))
# Now just update one record and checkpoint again.
self.large_updates(self.session, uri, bigvalue2, ds, nrows, 1)
hs_reads_start = self.get_stat(stat.conn.cache_hs_read)
self.session.checkpoint()
hs_reads = self.get_stat(stat.conn.cache_hs_read) - hs_reads_start
# Since we're dealing with eviction concurrent with checkpoints
# and skewing is controlled by a heuristic, we can't put too tight
# a bound on this.
self.assertLessEqual(hs_reads, 200)
if __name__ == '__main__':
wttest.run()
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