mongo/jstests/dur/a_quick.js

/* quick.js
   test durability
   this file should always run quickly
   other tests can be slow
*/

testname = "a_quick";
tst = {}

tst.log = function (optional_msg) {
    print("\n\nstep " + ++this._step + " " + (optional_msg || ""));
}

tst.success = function () {
    print(testname + " SUCCESS");
}

/* diff files a and b, returning the difference (empty str if no difference) */
tst.diff = function(a, b) {
    function reSlash(s) {
        var x = s;
        if (_isWindows()) {
            while (1) {
                var y = x.replace('/', '\\');
                if (y == x)
                    break;
                x = y;
            }
        }
        return x;
    }
    a = reSlash(a);
    b = reSlash(b);
    print("diff " + a + " " + b);
    return run("diff", a, b);
}
print(testname + " BEGIN");
tst._step = 0;

function checkNoJournalFiles(path, pass) {
    var files = listFiles(path);
    if (files.some(function (f) { return f.name.indexOf("prealloc") < 0; })) {
        if (pass == null) {
            // wait a bit longer for mongod to potentially finish if it is still running.
            sleep(10000);
            return checkNoJournalFiles(path, 1);
        }   
        print("\n\n\n");
        print("FAIL path:" + path);
        print("unexpected files:");
        printjson(files);
        assert(false, "FAIL a journal/lsn file is present which is unexpected");
    }
}

// directories
var path1 = MongoRunner.dataDir + "/quicknodur";
var path2 = MongoRunner.dataDir + "/quickdur";

// non-durable version
tst.log("start mongod without dur");
var conn = MongoRunner.runMongod({dbpath: path1, nojournal: ""});
tst.log("without dur work");
var d = conn.getDB("test");
assert.writeOK(d.foo.insert({ _id: 123 }));
tst.log("stop without dur");
MongoRunner.stopMongod(conn);

// durable version
tst.log("start mongod with dur");
conn = MongoRunner.runMongod({dbpath: path2, journal: "", journalOptions: 8});
tst.log("with dur work");
d = conn.getDB("test");
assert.writeOK(d.foo.insert({ _id: 123 }));

// we could actually do getlasterror fsync:1 now, but maybe this is agood 
// as it will assure that commits happen on a timely basis.  a bunch of the other dur/*js
// tests use fsync
tst.log("sleep a bit for a group commit");
sleep(8000);

// kill the process hard
tst.log("kill -9 mongod");
MongoRunner.stopMongod(conn.port, /*signal*/9);

// journal file should be present, and non-empty as we killed hard

// we will force removal of a datafile to be sure we can recreate everything
// without it being present.
removeFile(path2 + "/test.0");

// for that to work, we can't skip anything though:
removeFile(path2 + "/journal/lsn");

// with the file deleted, we MUST start from the beginning of the journal.
// thus this check to be careful
var files = listFiles(path2 + "/journal/");
if (files.some(function (f) { return f.name.indexOf("lsn") >= 0; })) {
    print("\n\n\n");
    print(path2);
    printjson(files);
    assert(false, "a journal/lsn file is present which will make this test potentially fail.");
}

// restart and recover
tst.log("restart and recover");
conn = MongoRunner.runMongod({restart: true,
                              cleanData: false,
                              dbpath: path2,
                              journal: "",
                              journalOptions: 9});
tst.log("check data results");
d = conn.getDB("test");

var countOk = (d.foo.count() == 1);
if (!countOk) {
    print("\n\n\na_quick.js FAIL count " + d.foo.count() + " is wrong\n\n\n");
    // keep going - want to see if the diff matches.  if so the sleep() above was too short?
}

tst.log("stop");
MongoRunner.stopMongod(conn);

// at this point, after clean shutdown, there should be no journal files
tst.log("check no journal files");
checkNoJournalFiles(path2 + "/journal");

tst.log("check data matches");
var diff = tst.diff(path1 + "/test.ns", path2 + "/test.ns");
print("diff of .ns files returns:" + diff);

function showfiles() {
    print("\n\nERROR: files for dur and nodur do not match");
    print(path1 + " files:");
    printjson(listFiles(path1));
    print(path2 + " files:");
    printjson(listFiles(path2));
    print();
}

if (diff != "") {
    showfiles();    
    assert(diff == "", "error test.ns files differ");
}

diff = tst.diff(path1 + "/test.0", path2 + "/test.0");
print("diff of .0 files returns:" + diff);
if (diff != "") {
    showfiles();
    assert(diff == "", "error test.0 files differ");
}

assert(countOk, "a_quick.js document count after recovery was not the expected value");

tst.success();