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Conclusion
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Eric Hodel did a great job with this little library The library doesn t try to be anything it is not It just tries to make using Rinda and RingServers a little easier, and it does that nicely My only complaint is the use of the hardcoded :name parameter in the Tuple template, but that is a small nuisance It also would ve been nice to get some help cleaning up the client side of things I would love to do the following in my client:
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RingyDingyfind(:MyRingyDingyLogger)
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That would definitely DRY up my client code Perhaps Eric will find it in his heart to update the library to do that In the documentation, RingyDingy mentions the following: If communication between the RingServer and the RingyDingy is lost, RingyDingy will re-register its service with the RingServer when it reappears Similarly, the RingServer will automatically drop registrations by a RingyDingy that it can t communicate with after a short timeout I think I understand what Eric means by all that However, that is as deep as the documentation goes on the subject I have not been able to test what I think he means, so I won t make any grand promises about what the library can and cannot do in regards to expiring/renewing registrations Considering its relative ease of use, if you are doing straight-up Rinda applications, dropping RingyDingy into the mix is easy, and it will help you manage your applications a little easier
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C HAPTER 4 Starfish
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Starfish1 bills itself as a utility to make distributed programming ridiculously easy I think that is a bit of an overstatement, but Starfish certainly can make distributed programming easier The library was built by Lucas Carlson of the website http://mogcom, who also co-wrote Ruby Cookbook (O Reilly Media, Inc, 2006)2 Starfish sets out to fulfill two different, but useful, roles in the distributed programming world In its first role Starfish sets out to play the part of a facilitator, setting up quick servers and clients that can be used to call and execute distributed code In its second role Starfish implements a Ruby version of the popular MapReduce3 distributed computing paradigm This chapter first looks at how to use Starfish to facilitate communication between distributed programs Then you ll find out more about how we can use it to write MapReduce functions
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Installation
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Starfish was built on DRb and Rinda as well as Lucas s own MapReduce library To install Starfish we can use RubyGems:
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$ gem install starfish
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You may have to run this command with root privileges, depending on your environment After installation you should see a message similar to the following:
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Successfully installed starfish-121
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4 Starfish
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Getting Started with Starfish
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The documentation for Starfish gives a simple piece of sample code to get us into the flow of the library:
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class Foo attr_reader :i def initialize @i = 0 end def inc loggerinfo "YAY it incremented by 1 up to #{@i}" @i += 1 end end server :log => "/tmp/foolog" do |object| object = Foonew end client do |object| objectinc end
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The documentation then tells us to run this code using the starfish binary So assuming that we saved this file using the rather original filename of foorb, we would execute this code like this:
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starfish foorb
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At this point you see something like the following printed on the screen:
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server started for #<Foo:0x184e774 @i=0>
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After that you will see nothing I recommend killing the process quickly so that you don t fill up your hard drive If we examine the code, we see that the inc method on the Foo class is writing to the log file we created at /tmp/foolog That is why we
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didn t see anything print to the screen after we executed our file Looking at our log file, we should see something like the following:
# Logfile created on Sat Apr 11 22:07:27 -0400 2009 by / YAY it incremented by 1 up to 0 YAY it incremented by 1 up to 1 YAY it incremented by 1 up to 18837 YAY it incremented by 1 up to 18838
It s good to know that the library works Now let s take a closer look at how it works, and then we ll try to make it do a few interesting things: