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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.
import random
import wiredtiger, wttest
# test_stat09.py
# Check oldest active read timestamp statistic
class test_stat09(wttest.WiredTigerTestCase):
tablename = 'test_stat09'
uri = 'table:' + tablename
conn_config = 'statistics=(all)'
# Check the oldest active read statistic to be at the expected values
def check_stat_oldest_read(self, statcursor, expected_oldest, all_committed):
self.check_stats(statcursor, expected_oldest,
'transaction: transaction read timestamp of the oldest active reader')
# If the active oldest timestamp is 0, it implies there are no active readers,
# the pinned range because of them is expected to be 0 in that case
if expected_oldest == 0:
expected_pinned = 0
else:
expected_pinned = all_committed - expected_oldest
self.check_stats(statcursor, expected_pinned,
'transaction: transaction range of timestamps pinned by the oldest '
'active read timestamp')
# Do a quick check of the entries in the stats cursor, the "lookfor"
# string should appear with the exact val of "expected_val".
def check_stats(self, statcursor, expected_val, lookfor):
# Reset the cursor, we're called multiple times.
statcursor.reset()
found = False
foundval = 0
for id, desc, valstr, val in statcursor:
if desc == lookfor:
found = True
foundval = val
self.printVerbose(2, ' stat: \'' + desc + '\', \'' +
valstr + '\', ' + str(val))
break
self.assertTrue(found, 'in stats, did not see: ' + lookfor)
self.assertTrue(foundval == expected_val)
def test_oldest_active_read(self):
self.session.create(self.uri, 'key_format=i,value_format=i')
c = self.session.open_cursor(self.uri)
# Insert some data: keys 1..100 each with timestamp=key, in some order
commit_range = 100
orig_keys = list(range(1, commit_range + 1))
keys = orig_keys[:]
random.shuffle(keys)
for k in keys:
self.session.begin_transaction()
c[k] = 1
self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(k))
# Create a cursor on statistics that we can use repeatedly
allstat_cursor = self.session.open_cursor('statistics:', None, None)
# There being no active reader, the corresponding statistic should be 0
self.check_stat_oldest_read(allstat_cursor, 0, commit_range)
# Introduce multiple transactions with varying read_timestamp
s1 = self.conn.open_session()
s1.begin_transaction('read_timestamp=' + self.timestamp_str(10))
s2 = self.conn.open_session()
s2.begin_transaction('read_timestamp=' + self.timestamp_str(20))
s3 = self.conn.open_session()
s3.begin_transaction('read_timestamp=' + self.timestamp_str(30))
s4 = self.conn.open_session()
s4.begin_transaction('read_timestamp=' + self.timestamp_str(40))
s5 = self.conn.open_session()
s5.begin_transaction('read_timestamp=' + self.timestamp_str(50))
# Check oldest reader
self.check_stat_oldest_read(allstat_cursor, 10, commit_range)
# Close the oldest reader and check again
s1.commit_transaction()
self.check_stat_oldest_read(allstat_cursor, 20, commit_range)
# Set and advance the oldest timestamp, it should be ignored for
# determining the oldest active read.
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(5))
self.check_stat_oldest_read(allstat_cursor, 20, commit_range)
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(30))
self.check_stat_oldest_read(allstat_cursor, 20, commit_range)
self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(150))
self.check_stat_oldest_read(allstat_cursor, 20, commit_range)
# Move the commit timestamp and check again
commit_range = 200
s2.commit_transaction('commit_timestamp=' + self.timestamp_str(commit_range))
self.check_stat_oldest_read(allstat_cursor, 30, commit_range)
# Close all the readers and check the oldest reader, it should be back to 0
s3.commit_transaction()
s4.commit_transaction()
s5.commit_transaction()
self.check_stat_oldest_read(allstat_cursor, 0, commit_range)
if __name__ == '__main__':
wttest.run()
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