some good details of Aurora innards
ex-Percona MySQL wizard Baron Schwartz, noting that MVCC as implemented in common SQL databases is not all that simple or reliable compared to big bad NoSQL Eventual Consistency:
Since I am not ready to assert that there’s a distributed system I know to be better and simpler than eventually consistent datastores, and since I certainly know that InnoDB’s MVCC implementation is full of complexities, for right now I am probably in the same position most of my readers are: the two viable choices seem to be single-node MVCC and multi-node eventual consistency. And I don’t think MVCC is the simpler paradigm of the two.
This is quite interesting/weird — Stripe’s protocol for mass-CCing email as they scale up the company, based around http://en.wikipedia.org/wiki/Civil_inattention
If their interests were better serving the world, using technology as a force for social justice, and equitably distributing technology wealth to enrich society … sure, they’d be acting against their interests. But the reality is that tech companies centralize power and wealth in a small group of privileged white men. When that’s the goal, then exploiting the labor of marginalized people and denying them access to power and wealth is 100 percent in line with the endgame. A more diverse tech industry would be better for its workers and everyone else, but it would be worse for the privileged white men at the top of it, because it would mean they would have to give up their monopoly on money and power. And they will fight that with everything they’ve got, which is why we see barriers to equality at every level of the industry.
Awesome! I was completely unaware this was coming down the pipeline.
A new, transactionally updated Ubuntu for the cloud. Ubuntu Core is a new rendition of Ubuntu for the cloud with transactional updates. Ubuntu Core is a minimal server image with the same libraries as today’s Ubuntu, but applications are provided through a simpler mechanism. The snappy approach is faster, more reliable, and lets us provide stronger security guarantees for apps and users — that’s why we call them “snappy” applications. Snappy apps and Ubuntu Core itself can be upgraded atomically and rolled back if needed — a bulletproof approach to systems management that is perfect for container deployments. It’s called “transactional” or “image-based” systems management, and we’re delighted to make it available on every Ubuntu certified cloud.
Ouch. I think Amazon did a better job of the Technical Track concept than this, at least
“git for operating system binaries”. OSTree is a tool for managing bootable, immutable, versioned filesystem trees. It is not a package system; nor is it a tool for managing full disk images. Instead, it sits between those levels, offering a blend of the advantages (and disadvantages) of both. You can use any build system you like to place content into it on a build server, then export an OSTree repository via static HTTP. On each client system, “ostree admin upgrade” can incrementally replicate that content, creating a new root for the next reboot. This provides fully atomic upgrades. Any changes made to /etc are propagated forwards, and all local state in /var is shared. A key goal of the project is to complement existing package systems like RPM and Debian packages, and help further their evolution. In particular for example, RPM-OSTree (linked below) has as a goal a hybrid tree/package model, where you replicate a base tree via OSTree, and then add packages on top.
Links for 2014-12-09
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