To understand development of Mesos Framework, I developed a simple useless framework example called msh.

• riywo/msh

Usage

At first, you should distribute this directory to the all slaves on the same location.

Then, you can run msh command on any server. For example:

$ cat /etc/hosts | ./msh -- cat -n 2>/dev/null
     1  127.0.0.1 localhost
     2
     3  # The following lines are desirable for IPv6 capable hosts
     4  ::1 ip6-localhost ip6-loopback
     5  fe00::0 ip6-localnet
     6  ff00::0 ip6-mcastprefix
     7  ff02::1 ip6-allnodes
     8  ff02::2 ip6-allrouters
     9  ff02::3 ip6-allhosts

Internal

• msh launches a msh-executor using one of resource offers
• msh-executor starts the given command as a subprocess
• msh reads its stdin and send the input to the slave as FrameworkMessage
• msh-executor receives messages and write them to the subprocess.stdin
• msh-executor reads the subprocess.stdout and sends the output to msh as FrameworkMessage
• Each other sends a message ‘EOF’ as a signal of end of the pipe
• msh prints received message

TODO

• work with no stdin
• streaming pipe
• pipe multiple tasks like UNIX shell
• interactive shell
• error handling

Conclusion

Development of Mesos framework in Python is very easy. I hope this toy project is useful for someone who is interested in Mesos.