“I’ve got a job description of ‘come hang out with us for a while and we’ll see what happens’, which is a pretty exciting thing,” - Lars Rasmussen.
(Lars made great contributions to Google in innovative products like Google Maps and Google Wave. He was also instrumental in starting engineering in the Google Sydney office.)
A Property Graph has a set of Vertices and a set of Edges.
Each Vertex has:
- A unique Identifier.
- A set of outgoing Edges.
- A set of incoming Edges.
- A collection of properties defined by a map from key to value.
Each Edge has:
- A unique Identifier.
- An outgoing tail vertex.
- An incoming head vertex.
- A label that denotes the type of relationship between its two vertices.
- A collection of properties defined by a map from key to value.
— David Allen (GTD)
This is a transcript of the podcast where James Gosling, the creator of Java talks about his past, current state of Java & more.
A good read for any one interested in Java, Software, OpenSource & stuff like that.
A few pluckings from the transcript:
“With Oracle it doesn’t have to make sense, it just has to make money. And one of the important things for the community to remember is that Oracle is deeply, deeply dependent on the success of Java.”
“I would guess that the Oracle lawyers did their homework. They almost, because they use open source, it’s really easy for the Oracle lawyers to go out and hire third-party experts to do the comparison. So they probably actually have a fairly solid case.” (regarding Oracles Law Suit over Google)
“…And you look at the way things like the NoSQL movement is. It’s various flavors of large scale distributed hash tables and trying to deal with massive scale and massive replication, and you can’t back up the database because no tape farm is big enough. And you find scale and reliability can fit together at the same time. So a bunch of those things are really cool. (46:35) I’m actually pretty excited about the sort of pragmatic evolution of the open source movement that is happening.”
“…what’s really valuable about open source is not what’s free as in beer, but what’s free as in speech. And then the collaborative development model - if you’re going to collaborate, like companies collaborating in a non-open source way, the legal frameworks for them end up being nightmares, and if things go snarky, it is a nightmare. The standard open source program is one of the only ways to make collaboration work. But if you make it open source, how do you pay salaries…”
“future isn’t something that’s rammed down our throats. The future is a choice. The human race is six or seven billion odd people each of which is making choices every day. You add up all those choices and that’s the direction of humanity.”
“Everything I care about is in the JVM. The JVM has worked out really, really well.”
“Google is kind of a funny company because a lot of them have this peace love and happiness version of evil.”
“well, what do I want to do when I grow up? And I’m kind of deeply confused about that. Part of the problem is that there’s just a whole lot of things that are really, really cool.”
Redmin on Windows with SQLite, Mongrel Cluster + Apache
I wanted to get the latest Redmine working on my Windows 2008 Server as a sub-URI under Apache. I’ve done this before about 6 months back but, having forgotten the detailed steps followed (and the glitches that were resolved), I made up my mind to write a HOWTO (for myself or you) as I get it running again on our new server.
Here is my main software config list:
- OS: Windows 2008 64 bit
- DB: SQLite 3.7.2
- Apache 2.2.16
- Ruby 1.8.6-p398
- Redmine 1.0.1
Note on choices:
I have Apache 2.2 because I already use it to publish mercurial repositories and also because there is enough help around to configuring open source software with Apache than with IIS. I chose SQLite in place of the default MySQL for ease of backups & management (I just backup 1 db file), it is good enough to hold redmine data for the team size & projects we have. Another important choice is the Ruby version, I chose Ruby 1.8.6 over 1.8.7 because win32-service which is required for us doesn’t work with 1.8.7 (you’ll come across this in one of the steps).
Note: This HOWTO is actually a variation of HowTo Install Redmine in a sub-URI on Windows with Apache”, which you should be looking at if your database happens to be MySql.
The Steps
1. Apache Setup: Download & install Apache server 2.2.x from here. (There are many HOWTOs around on the web for this, I am not getting into details)
2. SQLite Setup:
- Download SQLite 3.7.2 windows binaries from here.
- You need to get both sqlite-3_7_2.zip & sqlitedll-3_7_2.zip
- Extract both to folders and add them to the PATH. I have extracted them to D:\Software\sqlite-3_7_2 & D:\Software\sqlitedll-3_7_2 respectively and added both to my windows PATH.
- Decide on where you’d have your redmine database. I am keeping my database under D:\Software\reminedb\
- Use command prompt to go to the folder and create the database by typing: sqlite3 redmine.db
- Now redmine.db database should be created and the sqlite3 prompt should be seen “sqlite>”. In the sqlite prompt type .databases and you should see the database listed. You don’t need to create any tables, just exit by typing .quit .You should see your database file in the folder after exiting.
3. Ruby Setup:
- Download & install Ruby 1.8.6 from here, during setup select “Add Ruby executables to your PATH” and install the required ruby gems.
- You can check ruby version with: ruby -v & gem version with gem -v at the command prompt.
- Install the following gems as shown:
gem install rack -v=1.0.1
gem install rake -v=0.8.3
gem install rails -v=2.3.5
gem install sqlite3-ruby
- Next you need to download the following gems from here & here to a folder and install them manually.
mongrel-1.1.5-x86-mingw32.gem
mongrel_service-0.3.4-i386-mswin32.gem
win32-service-0.5.2-mswin32.gem
- From the command prompt I went to the folder where I had downloaded these gems and executed gem install mongrel which installed all the required gems for me (total 5 including gem_plugin-0.2.3, cgi_multipart_eof_fix-2.5.0 & others I have downloaded to the folder).
4. Redmine Setup:
Installing Redmine: Download redmine1.0.1 from here and extract the zip to a folder where you want to have your redmine installation. I kept it under D:\Software\redmine-1.0.1
- Now copy D:\Software\redmine-1.0.1\config\database.yaml.example to D:\Software\redmine-1.0.1\config\database.yaml
- Edit the database.yaml and configure your “production” environment, for SQLite my configuration file just has the following lines:
production:
adapter: sqlite3
database: D:\Software\redminedb\redmine.db
- Next from the command prompt goto the redmine installation folder D:\Software\redmine-1.0.1 and execute command rake generate_session_store
- Next execute command rake db:migrate RAILS_ENV=”production”
- Next load the default data with the following command rake redmine:load_default_data RAILS_ENV=”production”
5. Redmine as a sub-URI
Three things to configure.
1. Let redmine know that it needs to work as a sub-uri
- Edit D:\Software\redmine-1.0.1\config\environment.rb
- Assuming the url to access redmine is http://localhost/ptracker (you can choose anything you want in place of ptracker)
- Add the following line at the end of the file: ActionController::Base.relative_url_root = “/ptracker” and save the file.
2. Running Mongrel rails service
- Start a command prompt and create windows services with the following commands:
mongrel_rails service::install -N mongrel_redmine_3001 -D “mongrel_redmine_3001” -p 3001 -e production -c D:\Software\redmine-1.0.1
mongrel_rails service::install -N mongrel_redmine_3002 -D “mongrel_redmine_3002” -p 3002 -e production -c D:\Software\redmine-1.0.1
- Then start the services. (You can also configure them to start automatically on system start)
net start mongrel_redmine_3001
net start mongrel_redmine_3002
3. Configure Apache as proxy to Mongrel Cluster.
- You need to enable the following Apache modules: proxy_module (mod_proxy.so), proxy_http_module (mod_proxy_http.so), proxy_balancer_module (mod_proxy_balancer.so). Load these modules by editing the apache configuration file and un-commenting the corresponding LoadModule lines.
- create a file called redmine_apache.conf with the following lines in it and include it in your apache configuration file. You may also choose to directly add the configuration in httpd.conf but I suggest you keep it in a separate file and include it (just to keep your config clean).
ProxyPass /ptracker balancer://redminecluster
ProxyPassReverse /ptracker balancer://redminecluster
<Proxy balancer://redminecluster>
BalancerMember http://localhost:3001
BalancerMember http://127.0.0.1:3002
</Proxy>
- If you saved this in a file called redmine_apache.conf placed under D:\Software\redmine-1.0.1\redmine_apache.conf then to include it in apache conf, edit httpd.conf file and add the following line to it.
Include “D:/Software/redmine-1.0.1/redmine_apache.conf”
All Done, You restart Apache and access redmine in your browser typing the url:
http://localhost/ptracker
