Asymmetric distribution of data products from WALLABY, an SKA precursor neutral hydrogen survey

Abstract

Póster presentado online al congreso: Astronomical Data Analysis Software and Systems (ADASS) XXXI, celebrado el 24 – 28 October 2021 Cape Town, South Africa and online.- Video de la presentación https://adass2021.ac.za/uploads/X7-009/upload/X7-009_latest.mp4The Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) (1) is a neutral hydrogen survey(HI) that is running on the Australian SKA Pathfinder (ASKAP), a precursor telescope for the Square Kilometre Array(SKA). The goal of WALLABY is to use ASKAP's powerful widefield phased arrayfeed technologyto observe three quarters of the entire sky at the 21 cm neutral hydrogen line with an angular resolution of 30 arcseconds. Post-processing activities at the Australian SKA Regional Centre (AusSRC), Canadian Initiative for Radio Astronomy Data Analysis (CIRADA) and Spanish SKA Regional Centre prototype (SPSRC) will then produce publicly available advanced data products in the form of source catalogues,kinematic models and image cutouts, respectively. This scenario will require the replication and synchronisation of database tables across all sites where a multi-site data repository environment will be essential for efficient distribution management of the access, location and delivery of data.We explore the use of an asymmetric database replication model and strategy, using PostgreSQL as the engine and Bucardo as the asynchronous replication service to distribute data products from WALLABY. This work would serve to evaluate this type of data distribution solution across globally distributed sites and to confirm that the deployed model is sufficient for future scalability and remote collaboration needs