demo-erlang

The aim of this code is to test distribution computation in Erlang, using map-reduce.

The computation used in this example is counting the number of occurrences of each word in a big file.

Checkout latest version of the code and make sure you have compiled the code using :

git clone https://github.com/Erlang-Startups-Paris/distributed-wordcount
rebar g-d
rebar co
echo "client@localhost" > clients.txt

Create a big file called gros.txt

Simple Test with one client and a server

Open two shells, one client and another server and launch the following commands

On server	On client
./start_server.sh	...
(server@localhost)1> wc_server:register().	...
server registered	./start_client.sh
(server@localhost)2> wc_server:count(200).	Client client@localhost waiting for request
Waiting computation results	Receiving requests
Results	Results sent to server

Test with multiple clients and a server

Open three shells, two clients and one server. (This can be done on any number of nodes)

On the server node, update the file clients.txt with the clients names

client1@host1
client2@host2

Then launch the following commands :

On server	On client1	On client2
./start_server.sh	...	...
(server@localhost)1> wc_server:register().	...	...
server registered	erl -pa ebin -pa deps/*/ebin -s wc_client -sname client1@host1 -setcookie demo_app	erl -pa ebin -pa deps/*/ebin -s wc_client -sname client2@host2 -setcookie demo_app
(server@localhost)2> wc_server:count(200).	Client client1@host1 waiting for request	Client client2@host2 waiting for request
Waiting computation results	Receiving requests	Receiving requests
Global results	Results sent to server	Results sent to server