[GitHub] [druid] maytasm commented on issue #10553: Druid doesn't mark segments as "unused" when converting from a higher segment granularity to a lower segment granularity.

[GitBox <gi...@apache.org>]

maytasm commented on issue #10553:
URL: https://github.com/apache/druid/issues/10553#issuecomment-863623079


   This can be a result of the new DAY segments not fully covering the Month.
   For example if you have MONTH segment with 2020-10-01 to 2020-11-01 and you don't have data on every day in the month (for example, the only data rows you have are on 2020-10-08 to 2020-10-09), then Druid would only create new DAY segments for day with data (in the above example, you would only get one new segment 2020-10-08 to 2020-10-09). 
   Since Druid do not see DAY segments for every day of the month, Druid cannot mark unused the old MONTH segment.


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