[erlang-questions] Ideas on Distributed Programming on single machine

Christopher Meiklejohn cmeiklejohn@REDACTED
Sat Jan 17 20:46:17 CET 2015

> On Jan 17, 2015, at 8:23 PM, Harit Himanshu <harit.subscriptions@REDACTED> wrote:
> This is really dumb question and I am pretty sure that there is limit to how much distributed programming could be learnt using single machine(I am using Mac in this case).
> I am reading through Programming Erlang, Chapter 14, Distributed Programming where Joe talk about how to run Name Server in distributed mode as 
>  I write and test my program in a regular nondistributed Erlang session. This is what we’ve been doing up to now, so it presents no new challenges.
>  I test my program on two different Erlang nodes running on the same computer.
>  I test my program on two different Erlang nodes running on two physically separated computers either in the same local area network or anywhere on the Internet.

You can get pretty far using all of the networking tools provided with your operating system to simulate various network conditions.  I do all of my daily distributed programming and research using a stock MacBook.

Consider Kyle Kingsbury’s work on Jepsen where he’s able to find bug in several major distributed databases.  There are also tools such as ‘tc’ which can be used to add arbitrary latency between processes.

For what it’s worth, Basho does a significant amount of fault testing on a single machine by using fault-injection tools, or by facilities like ‘intercepts’ provided by Riak Test.

My advice is this: do everything locally on your machine until you have a reason to move to separate infrastructure; it will be easier to develop and debug.

- Chris

Christopher Meiklejohn
Senior Software Engineer
Basho Technologies, Inc.

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