diff options
Diffstat (limited to 'src/third_party/wiredtiger/test/suite/test_hs14.py')
-rw-r--r-- | src/third_party/wiredtiger/test/suite/test_hs14.py | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/test/suite/test_hs14.py b/src/third_party/wiredtiger/test/suite/test_hs14.py new file mode 100644 index 00000000000..ebd5f471f2b --- /dev/null +++ b/src/third_party/wiredtiger/test/suite/test_hs14.py @@ -0,0 +1,101 @@ +#!/usr/bin/env python +# +# Public Domain 2014-2020 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 time, wiredtiger, wttest + +def timestamp_str(t): + return '%x' % t + +# test_hs14.py +# Ensure that point in time reads with few visible history store records don't +# damage performance. +class test_hs14(wttest.WiredTigerTestCase): + conn_config = 'cache_size=50MB' + session_config = 'isolation=snapshot' + + def test_hs14(self): + uri = 'table:test_hs14' + self.session.create(uri, 'key_format=S,value_format=S') + self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1)) + cursor = self.session.open_cursor(uri) + + value1 = 'a' * 500 + value2 = 'b' * 500 + value3 = 'c' * 500 + value4 = 'd' * 500 + value5 = 'e' * 500 + + for i in range(1, 10000): + self.session.begin_transaction() + cursor[str(i)] = value1 + self.session.commit_transaction('commit_timestamp=' + timestamp_str(2)) + self.session.begin_transaction() + cursor[str(i)] = value2 + self.session.commit_transaction('commit_timestamp=' + timestamp_str(2)) + self.session.begin_transaction() + cursor[str(i)] = value3 + self.session.commit_transaction('commit_timestamp=' + timestamp_str(3)) + self.session.begin_transaction() + cursor[str(i)] = value4 + self.session.commit_transaction('commit_timestamp=' + timestamp_str(4)) + + start = time.time() + self.session.begin_transaction('read_timestamp=' + timestamp_str(3)) + for i in range(1, 10000): + self.assertEqual(cursor[str(i)], value3) + self.session.rollback_transaction() + end = time.time() + + # The time spent when all history store keys are visible to us. + visible_hs_latency = (end - start) + + for i in range(1, 10000): + self.session.begin_transaction() + cursor.set_key(str(i)) + cursor.remove() + self.session.commit_transaction('commit_timestamp=' + timestamp_str(5)) + self.session.begin_transaction() + cursor[str(i)] = value5 + self.session.commit_transaction('commit_timestamp=' + timestamp_str(10)) + + start = time.time() + self.session.begin_transaction('read_timestamp=' + timestamp_str(9)) + for i in range(1, 10000): + cursor.set_key(str(i)) + self.assertEqual(cursor.search(), wiredtiger.WT_NOTFOUND) + self.session.rollback_transaction() + end = time.time() + + # The time spent when all history store keys are invisible to us. + invisible_hs_latency = (end - start) + + self.assertLess(invisible_hs_latency, (visible_hs_latency * 10), + "Reader took an order of magnitude longer for when all " + "history store records were invisible, visible={}, invisible={}".format( + visible_hs_latency, invisible_hs_latency + )) |