jstests/noPassthrough/sync_write.js


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/**
 * SERVER-20617: Tests that journaled write operations survive a kill -9 of the mongod.
 *
 * This test requires persistence to ensure data survives a restart.
 * @tags: [requires_persistence]
 */
(function() {
    'use strict';

    //  The following test verifies that writeConcern: {j: true} ensures that data is durable.
    var dbpath = MongoRunner.dataPath + 'sync_write';
    resetDbpath(dbpath);

    var mongodArgs = {dbpath: dbpath, noCleanData: true, journal: ''};

    // Start a mongod.
    var conn = MongoRunner.runMongod(mongodArgs);
    assert.neq(null, conn, 'mongod was unable to start up');

    // Now connect to the mongod, do a journaled write and abruptly stop the server.
    var testDB = conn.getDB('test');
    assert.writeOK(testDB.synced.insert({synced: true}, {writeConcern: {j: true}}));
    MongoRunner.stopMongod(conn, 9);

    // Restart the mongod.
    conn = MongoRunner.runMongod(mongodArgs);
    assert.neq(null, conn, 'mongod was unable to restart after receiving a SIGKILL');

    // Check that our journaled write still is present.
    testDB = conn.getDB('test');
    assert.eq(1, testDB.synced.count({synced: true}), 'synced write was not found');
    MongoRunner.stopMongod(conn);
})();