jarifibrahim commented :
@JimWen dgraph debug tool can show the keys and its metadata. It’s not normal to have an sst file larger than 65 MB. The SST are bigger than 65MB only if you have too many duplicate keys. To get a ~3 GB of sst file, you’ll need too many duplicate keys (which doesn’t happen under normal usage).
Badger uses uint32 at multiple places and a values bigger than 4 GB will cause the uin32 to overflow and cause a crash.