361–370 of 453 posts
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On the network side no, it's much more crappy on AWS.
Which provider is the best, network wise?
I am not a database expert by any means but have been curious about distributed data systems and had not heard of FoundationDB till now and was very excited to read about it. On reading through the documentation, I encountered a section on "Known Limitations"[1] which stated that keys could not be larger than 10kb and values cannot be larger than 100kb. This seems to be a major limitation. Am I missing something or i…
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Does the trigger execute in scope of triggering transaction with the same isolation level?
Versionstamped operations and transaction logging are fully transactional. Watches are asynchronous: they are used to optimize a polling loop that would "work" without them.
https://forums.foundationdb.org/t/log-abstraction-on-foundat...
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FoundationDB at its core is not a graph database. You could build a graph database on top of it, using FoundationDB as a very strong and feature rich storage engine, however you'd like. It would be much simpler to do than building a new (especially a distributed) graph database from scratch.
So FDB's role is more comparable to that of, say, RocksDB or LevelDB than an application-level database like Postgres? I didn't really pay much attention to Foundation before Apple bought them and am unsure how it fits in the wider database ecosystem.
Noticed the Visual Studio project files. Was Windows a primary development platform for foundationdb?
Windows was never the most important deployment platform for the product. I'm not sure how performant the server is. But it should work, and I would think the client is fine.
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Honest question, does MongoDB work?
Until recently, no. But apparently they got serious about making it work and now it actually does. See https://jepsen.io/analyses/mongodb-3-4-0-rc3 for verification. I realized this 2 months ago at https://news.ycombinator.com/item?id=16386129
Congrats to the MongoDB team!
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Versionstamped operations and transaction logging are fully transactional. Watches are asynchronous: they are used to optimize a polling loop that would "work" without them.
Would versionstamped operations fit for the log abstraction modeling question I've asked about here on the forums? https://forums.foundationdb.org/t/log-abstraction-on-foundat...
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FoundationDB stores 2N+1 copies of some "coordination state" and does a consensus algorithm whenever it is updated. But this state doesn't contain a copy of your data; basically think of it as storing a replication configuration. It's very small and rarely changes. In the happy case, replication takes place using the replicas and quorum rules specified by this configuration. For example, you might require writes to s…
Yup, this works. I wonder if this is the first commercial application of this insight? http://hh360.user.srcf.net/blog/2016/08/majority-agreement-i... Can you tell us what consensus algorithm you're using? Raft, or something else? Your own implementation or something off the shelf?
The coordination consensus is (our own implementation of) disk paxos, which we liked for its operational properties in our context (the coordinators don't need to know about each other or communicate directly). An early version of fdb had a dependency on Zookeeper for this purpose; you can use anything.
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It seems that MUMPS doesn't have serializable isolation.
Yeah, when I read about that I thought it sounded neat—make sure the index updates with the data. On the other hand, I think of CAP theorem as an iron triangle. If you are gaining consistency, what’s the trade off?
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It's closest to TiDB's key-value layer; a building block for more complex systems. More traditional, monolithic databases like CockroachDB (SQL) or FaunaDB (NoSQL) trade off extensibility for the benefits in performance and operations that come from very tight coupling. In my understanding, FoundationDB's transaction management is closest to FaunaDB's; read/write sets are linearized in memory in preprocessing nodes a…
Wait CockroachDB is monolithic? I though it was distributed.