What is the use case that strongly recommends using Cloud Bigtable rather than Cloud Spanner? #8
Description
In Cloud Spanner, recently added "batch read" feature so that it can also handle "big data" "general" processing. (such as analysis and more)
Traditionally for Cloud BigTable was stated as "Google Cloud Bigtable is Google's NoSQL Big Data database service". However, the current trend for GCP products is migrating from the Megastore backend to Spanner backend. Cloud Spanner gets parallel reads, batch read and other feature to able to process "Big Data". Where does Cloud BigTable will fit now and the future?
Cloud Spanner ではなく Cloud Bigtable を使用することを強くお勧めするユースケースは何ですか？
Cloud Spanner にも batch read が追加されるなどして「ビッグデータ」での利用にもある程度耐えるものになっていると考えられるが、明確に Cloud Spanner よりも Cloud Bigtable を使うべきなのはどういう場面なのか。