gianm commented on issue #7394: A central place explaining and linking to different types of segments and tasks URL: https://github.com/apache/incubator-druid/issues/7394#issuecomment-548087364 > Seems to contradict the naming of `IndexerMetadataStorageCoordinator.announceHistoricalSegments()`. IMO, this method is misnamed. Most other usages of "announce" refer to announcing availability (most notably, DataSegmentAnnouncer). > If you are going to copy these descriptions somewhere to docs, there is a small problem with this description: looks like "available" segments are _always_ "published", not "in most cases". It's the opposite which is _in most cases_: "published" are in most cases "available". This also uses your prior definition of "published", which I suggest to keep "published used" or simply "used" above. Available segments can also be non-published in two situations. 1. Realtime segments, while they're being created. They are available and queryable but not published yet. 2. Previously-published segments, for a few minutes after being marked unused. They immediately become non-published, but stay available until the Coordinator asks Historicals to drop them, and they actually do so.
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