leventov 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-548081333 > published segment → a segment which has a record in the metadata store with used = 1. There is a long project to call such segments _used_ segments: https://github.com/apache/incubator-druid/pull/7306. I suggest to call them _published used_ or _published unused_, or simply _used_ or _unused_ for short. > announce → what Historicals do when they start serving a segment for querying. Seems to contradict the naming of `IndexerMetadataStorageCoordinator.announceHistoricalSegments()`. > available segment → a segment that is currently available for querying. In most cases, these are also published, but it isn't perfectly analogous (for example, a new segment is published immediately, but may take a few minutes to become available). 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.
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