clintropolis commented on issue #6988: [Improvement] historical fast restart by lazy load columns metadata(20X faster) URL: https://github.com/apache/incubator-druid/pull/6988#issuecomment-558562275 I did some testing with the latest version of this PR and everything is still working me. I also noticed that segment metadata queries performed by the broker to collect schema information for Druid SQL will likely do a fair bit of the work of loading the segments after the historical initializes, by lucky side-effect. Though I suspect that will not cover all replicas, it should definitely lessen the impact of using lazy loading I think.
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