_benedict

13 ms·

91.
by _benedict 4y ago
Swoon editions
92.
by _benedict 4y ago
Yes, Cassandra will still not be suitable for all workloads.
93.
by _benedict 4y ago
> when doing range scan query Yes, but probably not initially. The design supports them, it’s just not very pressing to implement since most users today use hash partitioners. There will be a lot of avenues in which to improve transactio
94.
by _benedict 4y ago
It will exist next year. Cassandra is getting HA ACID transactions (depending how you define C; we won't be getting foreign key constraints by then) that will be fast. Typically as fast (in latency terms) as a normal eventually consi
95.
by _benedict 4y ago
No, it won’t. Successfully written does not mean what you think it means. If there is “newer” (by timestamp) data on disk or in memtable then it will not be returned to a client, regardless of which order that data arrived. It is unlikely e
96.
by _benedict 4y ago
A timeout is pretty much always an unknown outcome. Cassandra does have dedicated exceptions for failed writes (which should have a certain outcome of not applied) but this is much rarer in practice. Cassandra does today inform you on timeo
97.
by _benedict 4y ago
Client B’s write will only be successfully read from 1 of the nodes it wrote to, and read-repair only runs on QUORUM reads. So, no, it will not be possible to read value 2 for 5m - it will never be visible to operations at QUORUM. This woul
98.
by _benedict 4y ago
LWTs were added for a very simple reason: stronger isolation where the performance trade-off makes sense. Nothing to do with the GP comment. Until recently they were indeed slow over the WAN, and they remain slow under heavy contention. The
99.
by _benedict 4y ago
No, that is literally impossible. If value 2 is newer than value 1, value 1 will never overwrite value 2. If a client reads value 2 at QUORUM then it will always be seen by all future queries.
100.
by _benedict 4y ago
They are not a different category. This is a distributed database, network errors and node failures are a fundamental part of its function. Fundamentally every distributed protocol has a moment where it may have to tell the client it has ab
101.
by _benedict 4y ago
> LWTs Single partition only. Poorly named, sure. Feature-wise though pretty comparable to peer offerings. Fortunately general purpose transactions are coming next year. > material views. Added, removed, readded, deprecated. No; add
102.
by _benedict 4y ago
You can only SELECT at QUORUM if you are guaranteed to be able to SELECT it again at QUORUM, ie it must be durable (and the QUORUM read will ensure it if the prior write did not). If you are selecting at ONE then yes, you can expect stale r
103.
by _benedict 4y ago
No, you wrote that you have to write and wait several minutes for data to replicate. This is straight-up false. Yes, if you mix consistency levels incorrectly you will do it wrong and maybe get stale data, but that is a different criticism.
104.
by _benedict 4y ago
Nothing bad? That’s the whole point of quorum reads and writes. You write to at least two, and read from at least two (one typically being a digest-only to corroborate the result). This is all done for you by Cassandra
105.
by _benedict 4y ago
Your statement about data propagation in that linked comment is at least misleading. A write at quorum will always be visible instantly to a read at quorum.
106.
by _benedict 4y ago
I’m sure Scott’s talk went into detail about this, but I can safely say that his team contributes a great deal to Cassandra
107.
by _benedict 4y ago
Well, whatever each of our perceptions about the utility of selecting an LTS, there are realities we all occupy - and LTS releases are a part of Cassandra's reality for the time being. Perhaps that will change in future, but I do not a
108.
by _benedict 4y ago
Well, it is not just Oracle that has adopted the LTS designations. AdoptOpenJDK and others are also selecting the same LTS versions to provide longer term support promises for, including security and other improvements. A major project like
109.
by _benedict 4y ago
Conversely, some applications would like a leaky abstraction they have some control over. Some caching will likely remain beneficial to link to a carrier thread. As a member of the Cassandra community I’m super excited to get my hands on vi
110.
by _benedict 4y ago
No, they then followed up with an influenza vaccine delivered by mRNA. This study assessed the relative quality of immune response in those that had previously received a sham vaccine delivered by LNP, or no prior vaccine (or LNP). > Two
111.
by _benedict 4y ago
Hmm, this seems to have been attached to the wrong parent comment, and I am now unable to delete it ¯\_(ツ)_/¯
112.
by _benedict 4y ago
I think perhaps their point is that, if some of the patients not discharged are consuming a nurse budget that isn’t required (because they are healthy and can be discharged), then this nurse budget could be redeployed to those waiting in ad
113.
by _benedict 4y ago
I’m really not sure what point you’re making. Where has anyone proposed a climate solution by using all of the world’s helium? What we do use helium for today are things like MRI machines that are medically invaluable, and we do so wasteful
114.
by _benedict 4y ago
Who knows is exactly the problem. Hand waving this away for future generations to deal with is exactly the problem. If we can’t imagine how we’ll solve it, we should probably strive not to create the mess.
115.
by _benedict 4y ago
https://www.helium-one.com/helium-market/ Apparently 8%. But all of these industries waste it unnecessarily, due to our failing to price in or consider the future scarcity. Helium as a waste product of fusion reactors
116.
by _benedict 4y ago
Millions of years of what? We have maybe a few hundred years of helium if we’re generous with our assumptions and we’re literally squirting that into balloons and letting it float away into the atmosphere and off into space . It’s literall
117.
by _benedict 4y ago
Your GP surgery is privately run, so in this case the issue is likely very much an issue of the supply of available doctors, and how your GP surgery chooses to operate its appointment system. I believe appointments are now run more efficien
118.
by _benedict 4y ago
The UK spends less per capita (PPP) than most other equivalent country's health system [1,2]? I never quite understand the "cost effective" arguments against the NHS. These costs include all of our private health care expen
119.
by _benedict 4y ago
The Independent is owned by Lebedev. It is part of the aforementioned oligarchy, literally.
120.
by _benedict 4y ago
You are not paying twice over. Your private insurance is dramatically cheaper than it would be if it covered everything covered by the NHS. You do have overlapping cover, but the most expensive cover (GP, long term chronic conditions, emerg

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