A few elements of the SONG software
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A few elements of the SONG software principles Søren Frandsen, Jonas B. Nielsen and Mads Fredslund Andersen Aarhus University. SONG Cluster Software. Flow: Both data and files. Simplified Architecture. Remote Site 1. Remote Site 2. Remote Site 3. Remote Site 8. Central Site.

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Song cluster software

A few elements of the SONG software

principles

Søren Frandsen, Jonas B. Nielsen

and Mads Fredslund Andersen

Aarhus University

SONG Cluster Software

SONG Software


Flow both data and files

Flow: Both data and files

Simplified Architecture

Remote Site 1

Remote Site 2

Remote Site 3

Remote Site 8

Central Site

Remote Site 4

Remote Site 7

Remote Site 6

Remote Site 5

SONG Software


Requirements

SONG Software

Requirements

  • All communication between sites via the database

    • One central site and eight remote sites

    • Central site center of communication (a star architecture)

  • Autonymous remote sites

    • Continue work if communication is lost

    • Eventually consistent

  • Open-source tools

    • Linux based


Major software component

SONG Software

Major Software Component

  • DBMS: PostgreSQL http://www.postgresql.org/

  • Database Replication: Slony-I http://slony.info/

  • File Replication: GlusterFShttp://www.gluster.org/

  • All

    • Open source projects/products

    • Mature projects

    • Good release cyclus

    • Good documentation


Database replication overview

SONG Software

dispatcher

or_status

or_status

commands

dispatcher_status

dispatcher_status

Obs. request

web_cam_1

web_cam_1

dispatcher

dispatcher

or_status

or_status

commands

commands

dispatcher_status

dispatcher_status

Obs. request

Obs. request

web_cam_1

web_cam_1

Database Replication, Overview

Central Node

Remote Node 1

Remote Node 2


Song cluster software

SONG Software

dispatcher

dispatcher

commands

commands

Obs. request

Obs. request

or_status

or_status

dispatcher_status

dispatcher_status

web_cam_1

web_cam_1

dispatcher

dispatcher

slony

checker

scheduler

worker

slony

Work processes

...

...

house

hold

Central Site

Remote Site n

Telescope

Weather


Song cluster software

SONG Software

Ordering an observation: Observing requests

Central: OR_handler.py

Site 1: OR_executer.py


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