1 files changed, 149 insertions, 0 deletions
diff --git a/jstests/noPassthrough/transaction_reaper.js b/jstests/noPassthrough/transaction_reaper.js
new file mode 100644
index 00000000000..c9a9e992cb2
--- /dev/null
+++ b/jstests/noPassthrough/transaction_reaper.js
@@ -0,0 +1,149 @@
+(function() {
+    'use strict';
+
+    function Repl(lifetime) {
+        this.rst = new ReplSetTest({
+            nodes: 1,
+            nodeOptions: {setParameter: {TransactionRecordMinimumLifetimeMinutes: lifetime}},
+        });
+        this.rst.startSet();
+        this.rst.initiate();
+    }
+
+    Repl.prototype.stop = function() {
+        this.rst.stopSet();
+    };
+
+    Repl.prototype.getConn = function() {
+        return this.rst.getPrimary();
+    };
+
+    Repl.prototype.getTransactionConn = function() {
+        return this.rst.getPrimary();
+    };
+
+    function Sharding(lifetime) {
+        this.st = new ShardingTest({
+            shards: 1,
+            mongos: 1,
+            config: 1,
+            other: {
+                rs: true,
+                rsOptions: {setParameter: {TransactionRecordMinimumLifetimeMinutes: lifetime}},
+                rs0: {nodes: 1},
+            },
+        });
+
+        this.st.s0.getDB("admin").runCommand({enableSharding: "test"});
+        this.st.s0.getDB("admin").runCommand({shardCollection: "test.test", key: {_id: 1}});
+    }
+
+    Sharding.prototype.stop = function() {
+        this.st.stop();
+    };
+
+    Sharding.prototype.getConn = function() {
+        return this.st.s0;
+    };
+
+    Sharding.prototype.getTransactionConn = function() {
+        return this.st.rs0.getPrimary();
+    };
+
+    const nSessions = 1500;
+
+    function Fixture(impl) {
+        this.impl = impl;
+        this.conn = impl.getConn();
+        this.transactionConn = impl.getTransactionConn();
+
+        this.sessions = [];
+
+        for (var i = 0; i < nSessions; i++) {
+            // make a session and get it to the collection
+            var session = this.conn.startSession({retryWrites: 1});
+            session.getDatabase("test").test.count({});
+            this.sessions.push(session);
+        }
+
+        this.refresh();
+        this.assertOutstandingTransactions(0);
+        this.assertOutstandingSessions(nSessions);
+
+        for (var i = 0; i < nSessions; i++) {
+            // make a session and get it to the collection
+            var session = this.sessions[i];
+            session.getDatabase("test").test.save({a: 1});
+        }
+
+        // Ensure a write flushes a transaction
+        this.assertOutstandingTransactions(nSessions);
+        this.assertOutstandingSessions(nSessions);
+
+        // Ensure a refresh/reap doesn't remove the transaction
+        this.refresh();
+        this.reap();
+        this.assertOutstandingTransactions(nSessions);
+        this.assertOutstandingSessions(nSessions);
+    }
+
+    Fixture.prototype.assertOutstandingTransactions = function(count) {
+        assert.eq(count, this.transactionConn.getDB("config").transactions.count());
+    };
+
+    Fixture.prototype.assertOutstandingSessions = function(count) {
+        assert.eq(count, this.getDB("admin").system.sessions.count());
+    };
+
+    Fixture.prototype.refresh = function() {
+        assert.commandWorked(this.getDB("admin").runCommand({refreshLogicalSessionCacheNow: 1}));
+    };
+
+    Fixture.prototype.reap = function() {
+        assert.commandWorked(
+            this.transactionConn.getDB("admin").runCommand({reapLogicalSessionCacheNow: 1}));
+    };
+
+    Fixture.prototype.getDB = function(db) {
+        return this.conn.getDB(db);
+    };
+
+    Fixture.prototype.stop = function() {
+        this.sessions.forEach(function(session) {
+            session.endSession();
+        });
+        return this.impl.stop();
+    };
+
+    [Repl, Sharding].forEach(function(Impl) {
+        {
+            var fixture = new Fixture(new Impl(-1));
+            // Remove a session
+            fixture.getDB("admin").system.sessions.remove({});
+            fixture.assertOutstandingTransactions(nSessions);
+            fixture.assertOutstandingSessions(0);
+
+            // See the transaction get reaped as a result
+            fixture.reap();
+            fixture.assertOutstandingTransactions(0);
+            fixture.assertOutstandingSessions(0);
+
+            fixture.stop();
+        }
+
+        {
+            var fixture = new Fixture(new Impl(30));
+            // Remove a session
+            fixture.getDB("admin").system.sessions.remove({});
+            fixture.assertOutstandingTransactions(nSessions);
+            fixture.assertOutstandingSessions(0);
+
+            // See the transaction was not reaped as a result
+            fixture.reap();
+            fixture.assertOutstandingTransactions(nSessions);
+            fixture.assertOutstandingSessions(0);
+
+            fixture.stop();
+        }
+    });
+})();