3 ms·

Not getting how this helps. How do they know if the data is stale in SSDB? If the data is immutable I get that caching it locally speeds things up, but then co

by porker 5y ago

Not getting how this helps. How do they know if the data is stale in SSDB? If the data is immutable I get that caching it locally speeds things up, but then couldn't they merely mirror files and check if the file exists?

welder 5y ago
The majority of code stats (the data being stored) is received for the current day. Older data still comes in, but in that case we just update the SSDB cache after writing the new data to S3. The reason we don't use SSDB as the main source of truth is because S3 provides replication and resilience.
- bobmaxup 5y ago
  > Caching is basically the same thing as a mirror Can you elaborate?
  - welder 5y ago
    Sure, I meant a mirror is just a cache for data that doesn't change. I edited the original comment, because it doesn't help explain why we used SSDB here.