> RonDB provides Class 6 Availability, meaning its system is operational 99.9999% of the time, thus no more than 30 seconds of downtime per year. This ensures that RonDB is always available.
I get marketers stretch the truth all the time, but they can't possibly be serious.
Such uptimes aren't in the realms of impossibility. They do remain very hard to design and engineer, however.
Famously, Amazon SLAs Route53 with a 100% uptime (for its data-plane) [0] (not sure if any other AWS service comes close). So, here's at least one KV store that's one-ups RonDB.
That's an SLA where they expect to end up paying customers back for outages. They've done an admirable job with only a few global outages, but subsets of customers have experienced plenty of outages.
A single 5 min outage would blow through more than a decade of SLO at 6 9s. As far as I'm aware, there does not exist a service that has been up for more than a decade with fewer than 5 min of downtime, and that definitely includes route 53.
Note that it is the dominant subscriber database in the telecom space. There is a high likelihood you are using it as part of a home location registry or similar when you use your phone.
Here's a benchmark comparison with Redis (outperforms it on a single node):
Here's a YCSB benchmark where it beats all other well known key-value stores (not reproducible, but all database vendors (except RonDB) have a DeWitt Clause):
These numbers are based on NDB customer experiences from operating tens of thousands of NDB clusters for more than 10 years. Obviously to achieve 99.9999% uptime requires an operational competence as well as the software to achieve it. This is why we are building this operational competence to make those numbers accessible to anyone.
Six nines is completely doable if you have the money. Availability is more limited by cost than technical difficulty.
Also consider that availability just means "the service is still running". It may be practically unusable but still available. Always read the fine print.
(Actually their math is wrong: six nines is 31.5 seconds of downtime)
ignoramous|4 years ago
Famously, Amazon SLAs Route53 with a 100% uptime (for its data-plane) [0] (not sure if any other AWS service comes close). So, here's at least one KV store that's one-ups RonDB.
[0] https://news.ycombinator.com/item?id=22361358
partiallattice|4 years ago
A single 5 min outage would blow through more than a decade of SLO at 6 9s. As far as I'm aware, there does not exist a service that has been up for more than a decade with fewer than 5 min of downtime, and that definitely includes route 53.
jamesblonde|4 years ago
https://www.mysql.com/products/cluster/availability.html
Note that it is the dominant subscriber database in the telecom space. There is a high likelihood you are using it as part of a home location registry or similar when you use your phone.
Here's a benchmark comparison with Redis (outperforms it on a single node):
https://www.logicalclocks.com/blog/ai-ml-needs-a-key-value-s...
Here's a YCSB benchmark where it beats all other well known key-value stores (not reproducible, but all database vendors (except RonDB) have a DeWitt Clause):
https://www.slideshare.net/ocklin/mysql-ndb-cluster-80-sql-f...
https://www.slideshare.net/mikaelronstrom/ndb-cluster-80ycsb...
mikaelronstrom|4 years ago
willvarfar|4 years ago
0xbadcafebee|4 years ago
Also consider that availability just means "the service is still running". It may be practically unusable but still available. Always read the fine print.
(Actually their math is wrong: six nines is 31.5 seconds of downtime)
mikaelronstrom|4 years ago