What is the durability of the memory store?
In a previous question/response on here someone asked about durability of the timestream memory store, and the response was assuring but very qualitative. It would be nice to see an actual durability spec, like there is for s3 https://docs.aws.amazon.com/AmazonS3/latest/userguide/DataDurability.html
I think that it's a "memory store" makes people nervous. The fact that it's replicated in three different AZs definitely reassures. Still, the durability is one of the reasons you might choose a shorter memory store duration, because once it's moved to S3 you know.
There is a picture HERE that shows that the memory store replicates from AZ to AZ through "external durable storage." I'm not sure what that is, but it makes it sound like even if ALL the memory stores went away some physical storage would still be there - even for data that didn't make it to the s3 tier yet.
Could we perhaps nudge AWS to conjure up a plausible durability spec?
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Amazon Timestream takes data durability seriously. It automatically replicates both your memory and magnetic store data across various Availability Zones within one AWS Region. This means even if something happens to one zone, your data remains safe in others.
Moreover, every piece of data is written to disk before confirming the completion of your write request. This guarantees that your data is well-protected and won't disappear unexpectedly. So, when it comes to durability, Timestream has got you covered, ensuring data's safety and reliability. The below document can be refereed
[+] https://docs.aws.amazon.com/timestream/latest/developerguide/storage.html
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Thanks, the part I didn't understand was that "All of your data is written to disk before acknowledging your write request as complete" also means the data that's just in "memory store." When I read "memory" I wasn't thinking that tier was also going to disk.