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-548058373 The definitions I have been using recently when writing docs and method names are: - _pending segment_ → a segment that is currently being built by an indexer, but hasn't had its metadata inserted into the metadata store yet. - _pushed segment_ → a segment that has been written to deep storage. This happens before publishing (see next term). - _published segment_ → a segment which has a record in the metadata store with `used = 1`. All published segments should also be pushed. None of them are pending. - _publish_ → the act of inserting segment records into the metadata store (what the Overlord does when SegmentInsertAction is called). - _insert_ → a synonym for _publish_. _publish_ is preferred over _insert_. - _announce_ → what Historicals do when they start serving a segment for querying. - _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). - _available segment_ → a synonym for _announced segment_. - _announced segment_ → a synonym for _available segment_. I prefer _available segment_ to _announced segment_.
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