Can I use GCS as deep storage?

Deep storage is where segments are stored. It is a storage mechanism that Apache Druid does not provide. Deep storage is an important part of Druid’s elastic, fault-tolerant design. Druid bootstraps from deep storage even if every single data server is lost and re-provisioned.

GCS is one of the deep stores which can be connected to Apache Druid, through this extension or this one. Here’s a recent example of a community member connecting to GCS, along with a bit of troubleshooting and resolution.