QiuMM commented on issue #6723: Druid-redis does not provide a historical buffer interface? URL: https://github.com/apache/incubator-druid/issues/6723#issuecomment-446450729 > the broker also has segment buffer information. I think you may talk about segment metadata information. If you enabled sql on your broker, it will do [segment metadata queries](http://druid.io/docs/latest/querying/segmentmetadataquery.html) to obtain information about segment schema. These queries' result would be cached if you enabled the cache.
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