1 files changed, 119 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/test/suite/test_truncate19.py b/src/third_party/wiredtiger/test/suite/test_truncate19.py
new file mode 100644
index 00000000000..1afda92e738
--- /dev/null
+++ b/src/third_party/wiredtiger/test/suite/test_truncate19.py
@@ -0,0 +1,119 @@
+#!/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 os, wttest, suite_random
+from wiredtiger import stat
+from wtdataset import SimpleDataSet
+from wtscenario import make_scenarios
+
+# test_truncate19.py
+#
+# Test to mimic oplog workload in MongoDB. Ensure the deleted pages are
+# cleaned up on disk and we are not using excessive disk space.
+class test_truncate19(wttest.WiredTigerTestCase):
+    conn_config = 'statistics=(all)'
+
+    format_values = [
+        ('string_row', dict(key_format='S', value_format='S')),
+    ]
+    scenarios = make_scenarios(format_values)
+
+    def append_rows(self, uri, ds, start_row, nrows, value):
+        cursor = self.session.open_cursor(uri)
+        self.session.begin_transaction()
+        for i in range(start_row, start_row + nrows + 1):
+            cursor[ds.key(i)] = value
+            if i % 2 == 0:
+                self.session.commit_transaction()
+                self.session.begin_transaction()
+        self.session.commit_transaction()
+        cursor.close()
+
+    def do_truncate(self, ds, start_row, nrows):
+        self.session.begin_transaction()
+        hicursor = self.session.open_cursor(ds.uri)
+        hicursor.set_key(ds.key(start_row + nrows))
+        self.session.truncate(None, None, hicursor, None)
+        self.session.commit_transaction()
+
+    def test_truncate19(self):
+        uri = 'table:oplog'
+        nrows = 1000000
+
+        # Create a table.
+        ds = SimpleDataSet(self, uri, 0, key_format=self.key_format, value_format=self.value_format)
+        ds.populate()
+        ds_dummy = SimpleDataSet(self, 'table:dummy', 0, key_format=self.key_format, value_format=self.value_format)
+        ds_dummy.populate()
+
+        value_a = "aaaaa" * 100
+
+        # Write some data
+        self.append_rows(uri, ds, 1, nrows, value_a)
+        self.session.checkpoint()
+
+        # Reopen the database.
+        self.reopen_conn()
+
+        # Session for checkpoint
+        session2 = self.conn.open_session()
+        # Session for long running transaction, to make truncate not globally visible
+        session3 = self.conn.open_session()
+
+        trunc_rows = 0
+        start_num = 1
+        end_num = nrows
+        for i in range(1, 50):
+            # Start a long running transaction
+            session3.begin_transaction()
+            trunc_rows = 10000
+
+            self.do_truncate(ds, start_num, trunc_rows)
+            
+            # Check stats to make sure we fast-deleted at least one page.
+            stat_cursor = self.session.open_cursor('statistics:', None, None)
+            fastdelete_pages = stat_cursor[stat.conn.rec_page_delete_fast][2]
+  
+            self.assertGreater(fastdelete_pages, 0)
+
+            # Take a checkpoint.
+            session2.checkpoint()
+            # Ensure the datasize is smaller than 600M
+            self.assertGreater(600000000, os.path.getsize("oplog.wt"))
+            session3.rollback_transaction()
+        
+            self.append_rows(uri, ds, end_num, trunc_rows, value_a)
+
+            end_num = end_num + trunc_rows
+            start_num = start_num + trunc_rows
+
+        session2.checkpoint()
+        # Ensure the datasize is smaller than 600M
+        self.assertGreater(600000000, os.path.getsize("oplog.wt"))
+
+if __name__ == '__main__':
+    wttest.run()