Status of OrientDB - orientdb

I've been looking at switching over to an object database and stumbled upon OrientDB. I really like what I'm seeing, particularly the Java Object API. It's been around for awhile and their website looks new and shiny, but the community forums on the site appear to be dead and the documentation seems out-of-date. I've asked several questions there and have received no answers or views. Have I discovered this product too late? Should I look for something else? Anyone have any insight into the state of this product?

Not dead at all, OrientDB is still being actively developed and all docs are updated to the latest version which is 3.0, but you can also find the 3.1 beta and previous versions such as 2.1 and 2.2.

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Better documentation and instructions for Mirth upgrades?

Several days ago, Mirth Connect version 3.3.0 was released. Noting the great new features, we decided to upgrade immediately (just days after the initial release). We followed these Upgrade Guide instructions during the upgrade. However, the specifics of upgrading from 3.2 to 3.3 are missing from these Upgrade Guide, so we did not suspect much to change on the way Mirth should be implemented...
During this process, we ran into a handful of issues that caused our production channels to go down for several hours (†).
It would have been really nice to have specific information for this upgrade. Some issues that would have been really useful to know beforehand (just examples, no need to actually answer):
Are you changing the default toString() method for objects/arrays to return JSON representations?
Does this upgrade include a db migration, meaning we can't revert to
previous version once upgraded?
Because code templates are now children of "libraries", will we need to access the code template through the library, or will we be able to call it directly (as it was in 3.2)?
A solid documentation like this would have allowed us to understand the full gravity of what needs to be accounted for when upgrading. Typically, Mirth has some documentation for each minor release. But even then, the documentation is very terse. Would it be possible for the Mirth team to start being very explicit with what the upgrade entails?
The Rails Upgrade Guide (obviously much larger team, so can spend more bandwidth on this spec) provides a really great example of what an upgrade guide should entail.
† yes, yes, I learned my lesson, I won't upgrade immediately to production anymore
The Release Notes page will give the lowest level of changes to the application, but you're right in that a better documentation is needed.

node.js JSON/REST framework for a single-page application

I'm developing an application that consists of a 'fat' javascript client backed by a JSON/REST server for data access. The data is stored in mongodb but the system should be flexible enough to switch to a relational backend if required.
I started out with pintura as the server side framework but recently ran into some problems (specifically with the perstore/filestore). I noticed that one problem has even been reported (including a fix) over a month ago, but there has been no reply to it and the issue is still present.
There seems to be relatively low activity in this project so I was wondering if many people are actually using it, and how stable the framework is.
Does anybody here have experience with this framework or know of an alternative framework that has similar capabilities?
I agree the project and the website/blog does not seem to be active, although the perstore repository does have recent activity. I'd contact the author there since your problem seems more related to that.
A search for REST on http://search.npmjs.org/ will show quite a few results, although I cannot recommend any from experience.

Anyone know what tumblr is written in

Does anyone know what tumblr is written in? I have been trying to figure it out.
It's PHP...
http://www.marco.org/55384019
spiteshow:
I wonder if the Tumblr guys are using a framework or if it is all home brew.
Both: it’s a homebrew framework to add MVC structure and a useful secondary function library to PHP 5 that we started in 2006 and have constantly evolved into a very finely tuned framework for our needs. The same framework runs some of Davidville’s former consulting-client sites as well as all of my personal sites and projects. It’s not available publicly anywhere, but we may release it in the future.
The lead developer's blog features a lot of PHP-related material, and Tumblr was advertising for PHP developers a while ago. This isn't strong evidence, but it's possibly indicative and it's the best I could find.
Here's the full stack as of 2013.
"We're a LAMP based stack (Linux Apache MySQL PHP) with Scala for our many services. Other pieces of tech we use currently in production are Memcached, Varnish and Redis."
http://smcdermott.tumblr.com/post/46847264498/what-language-is-tumblr-written-in-all-php
I just logged in to my account and added the index.php and it worked, so it must be php.
http://www.tumblr.com/dashboard/index.php

Are there any CMS based on document-based database?

I did some googling, not much come up.
Drupal 7 has support for MongoDB coming (alpha release).
I found Avinu linked from Mongo's production deployment page. I didn't see any other CMSs there, though. Edit: And they don't actually have any source available right now.
LocomotiveCMS is an open source CMS written in Ruby which uses MongoDB as its data store.

NHaml - still active?

I accidentally stumbled across NHaml and really like what I have seen of it. However, checking the blogs of the authors and Google group reveals that there doesn't seem to be much happening.
Is it worth investing time in NHaml - is it going forward actively? If anyone can point me to the centre of activity for NHaml or at least let me know the "state of play", I would appreciate it.
Nhaml is still active. Although Andrew is no longer active in its developement.
It has also moved out of MVCContrib and is now a project on Google code http://code.google.com/p/nhaml/
The google group is reasonably active
http://groups.google.com/group/nhaml-users/about
Not sure if lack of blogs posts means a project is stagnating?
It is probably better to look at the
issue list or the
checkin list
And we are always happy to take contributions
Russell Allen is actively developing NHaml with the goal of integrating it into NancyFx as a view engine.
I have been using NHAML for about 9 months on an ASP.NET MVC project. I like it a lot but I think you may want to consider the Spark View Engine. While I believe NHAML is still an active project, it is not very well documented. Spark is very well documented and has a series of tutorials by developers. I will be using Spark in most of my projects in the future
You can check out the SparkViewEngine at link text .