peferron edited a comment on issue #4947: Historicals should only write to remote cache URL: https://github.com/apache/incubator-druid/issues/4947#issuecomment-470884379 > the cache key could be evicted from memcached, but stay in local cache on a historical. @leventov in this situation, this cache key will not get populated again into memcached as long as it's still present in the historicals local cache, right? Queries for this cache key will always result in a broker remote cache miss, followed by a historical local cache hit which doesn't populate the remote cache. This seems undesirable if queries for this cache key keep coming frequently, but might work well in practice if the ultimate goal is to cut the number of segment scans without caring where the cache hit comes from.
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