request hangs somehow

[Ognian]

Starting this trivial static file sever:

var express = require('express'),
    app = express(),
    http = require('http'),
    server = http.createServer(app)
    ;
var morgan = require('morgan');
app.use(morgan('dev')); //this is the express logger...
app.use(require('errorhandler')({dumpExceptions: true, showStack: true}));
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// HERE comes the problem:
var session = require('express-session');
var MongoHttpSessionStore = require('connect-mongostore')(session);

var cookieParser = require('cookie-parser');
app.use(cookieParser());

app.use(session({
        secret: "x",
        store: new MongoHttpSessionStore(
            {
                collection: "_sTEST_delete",
                db: "test"
            }
        ),
        cookie: {
            maxAge: 60000 * 30
        }, // in minute(s) from milliseconds-> *60000
        // the following are both default true
        resave: true,
        saveUninitialized: true
    }
));
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
app.use('/', express.static(__dirname + '/public')); //at last try to find if this is a static file...
server.listen(3005);
console.log("started on port 3005");

and testing it with apache bench

ab -c 1 -n 2 -k http://localhost:3005/test.html

leads to the Problem that the second request is never being answered.
If issuing manual several test with

ab -c 1 -n 1 -k http://localhost:3005/test.html

every thing is ok.
Using a memory store session by commenting out the "store" property works also OK even with:

ab -c 10 -n 10000 -k  http://localhost:3005/test.html

I came to this striped down example from a much bigger one, where I have the problem that "sometimes" request do not get answered and time out...

Any ideas?
Thanks
Ognian

[Ognian]

Hmm, could be that the problem is even deeper in express-session, since penetrating with:

 ab -c 1 -n 100 -k http://localhost:3005/test.html

when "store" is memory

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// HERE comes the problem:
var session = require('express-session');
var MongoHttpSessionStore = require('connect-mongostore')(session);

var cookieParser = require('cookie-parser');
app.use(cookieParser());

app.use(session({
        secret: "x",
        //store: new MongoHttpSessionStore(
        //    {
        //        collection: "_sTEST_delete",
        //        db: "test"
        //    }
        //),
        cookie: {
            maxAge: 60000 * 30
        }, // in minute(s) from milliseconds-> *60000
        // the following are both default true
        resave: true,
        saveUninitialized: true
    }
));
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

leads to 16 completed requests...

[diversario]

So it looks like express folks are looking into this. Do you want to keep this issue open?

[Ognian]

Hello,
sorry for the late answer.
I think we should let it open. The express guys where unable to reproduce and it could be that I have somehow oversimplified the test case and that I've reached now some limit with ab testing. In my actual app I was able to reproduce the problem just by using a browser and not a load test..
I need to finish up now some other things and thereafter I will go again thru the whole process and report here...
Thanks
Ognian

[Ognian]

closing this for the reasons explained in expressjs/session#91
Thanks
Ognian