kaijianding commented on issue #6661: Slow timeBoundary queries URL: https://github.com/apache/incubator-druid/issues/6661#issuecomment-443448976 This is not related to mysql. @erankor do you have large number of segments in this datasource? I guess the second time to issue this TimeBoundary query would be faster due to the cache. But if you have large number of segments, the segmentMetadata can be always slow, the bottleneck is the broker merging.
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