himanshug edited a comment on issue #8713: Improper result-level cache ETag handling for union datasources URL: https://github.com/apache/incubator-druid/issues/8713#issuecomment-545676670 Thanks for the detailed information. I think `UnionDataSource` should handle this special case which would solve the problem for both `ResultLevelCache` and for users with their own result level cache outside of Druid that are using same protocol. `UnionDataSource` should have different `ResponseContext` objects for different queries and merge them into a single [maybe nested] `ResponseContext` object in the end. The merge process creates the `top level Etag = serialize-to-string(array of ETag objects from each query response)` Also, If `UnionDataSource` receives `If-None-Match` key in the incoming `ResponseObject` , it should assume that would be a serialized string from array, break it into elements and add to one per datasource query `ResponseObject` it creates. If `If-None-Match` value is not deserializable into string array of size N (number of datasources) then dont use it.
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