jihoonson commented on issue #8575: Decouple segment storage and serving on Historicals URL: https://github.com/apache/incubator-druid/issues/8575#issuecomment-534348747 Interesting idea. Couple of questions. > problems in Historical Java processes may not affect the download layer and vice versa. What problems in Historical Java processes are you referring here? > To facilitate segment downloads, there are very simple servers running alongside historical Java processes (sidecars) which know only how to serve specific columns of segments. Probably this sidecar should be able to process simple filters, so that row selection as well as column projection could be done in storage historicals.
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