Thanks, this confusion came from the docs, both RT and Batch ingestion mechanisms descriptions share same sources when user reaches DataSchema paragraph (for RT it just contains a link to http://druid.io/docs/latest/Ingestion.html where csv is described).
Anyway, I’ve tried batch ingestion and got well-known in these groups error:
javax.servlet.ServletException: com.fasterxml.jackson.databind.JsonMappingException: Instantiation of [simple type, class io.druid.indexing.common.task.IndexTask] value failed: null.
How hard is to make this error more user-friendly? I’ve checked validity of JSON file, checked format of CSV file - everything looks good, I don’t know what to do next, please suggest something.