mongodb/jstests/sharding/single_shard_transaction_with_arbiter.js

/**
 * Tests that single shard transactions succeed against replica sets that contain arbiters.
 *
 * A config server can't have arbiter nodes.
 * @tags: [
 *   uses_transactions,
 *   config_shard_incompatible,
 * ]
 */

import {ShardingTest} from "jstests/libs/shardingtest.js";

const name = "single_shard_transaction_with_arbiter";
const dbName = "test";
const collName = name;

const shardingTest = new ShardingTest({
    shards: 1,
    rs: {
        nodes: [
            {/* primary */},
            {/* secondary */ rsConfig: {priority: 0}},
            {/* arbiter */ rsConfig: {arbiterOnly: true}},
            {/* secondary */ rsConfig: {priority: 0}},
            {/* secondary */ rsConfig: {priority: 0}},
        ]
    }
});

const mongos = shardingTest.s;
const mongosDB = mongos.getDB(dbName);
const mongosColl = mongosDB[collName];

// Create and shard collection beforehand.
assert.commandWorked(mongosDB.adminCommand({enableSharding: mongosDB.getName()}));
assert.commandWorked(
    mongosDB.adminCommand({shardCollection: mongosColl.getFullName(), key: {_id: 1}}));
assert.commandWorked(mongosColl.insert({_id: 1}, {writeConcern: {w: "majority"}}));

const session = mongos.startSession();
const sessionDB = session.getDatabase(dbName);
const sessionColl = sessionDB.getCollection(collName);

// Start a transaction and verify that it succeeds.
session.startTransaction();
assert.commandWorked(sessionColl.insert({_id: 0}));
assert.commandWorked(session.commitTransaction_forTesting());

assert.eq({_id: 0}, sessionColl.findOne({_id: 0}));

shardingTest.stop();