Hi,
I am currently trying to understand hail design inside out. However, I couldn’t find any hail design philosophy or architecture document. It could be a workflow diagram as well.
Could you please point me to it?
There are some materials on this topic here:
Thanks for the material.
Out of curiosity, is there a research paper published by your team on hail?
No, there’s not (yet…)
We recognize the benefit for having a paper, but our team generally enjoys writing code more than prose 
. It’s also been hard in the past to choose a “stopping point” to write about the architecture – while interfaces have changed very little during the life of Hail 0.2, the backend infrastructure has changed dramatically.
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On the upgrades side, I was trying to see if there is any .Changelog file in GitHub repository. Is there a place where I can see the summary or highlights of upgrades happened during life of Hail 0.2?
There’s a changelog on the site, but that’s only for user-facing changes, many of which are minor bugfixes, performance improvements, or minor new features. We don’t have a curated changelog of backend changes.