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diff --git a/src/third_party/wiredtiger/test/suite/test_hs14.py b/src/third_party/wiredtiger/test/suite/test_hs14.py
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+#!/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
+ ))