3 ms·
Google Megastore - 3 Billion Writes and 20 Billion Read Transactions Daily
- rbranson 16y agoWrites are limited to 1 per second, so HRD is not a good match when high usage is expected. This is per entity group, and it's not a strict limitation, it's an expectation of performance.
- redstripe 16y ago"Backups and redundancy are achieved via synchronous replication, snapshots, and incremental log backups." That's nice but you can't access these backups. They are there for the system failing - not for your own needs. RAID is not a backup strategy.
- equark 16y agoIt's built on top of bigtable, so presumably users can request the state of an object at any point in time just by specifying a timestamp with their query.
- redstripe 16y agoI don't think that's an ability that's exposed to app engine users. I don't see any mention of it: http://code.google.com/appengine/docs/python/datastore/ http://code.google.com/appengine/docs/python/datastore/