[GitHub] [incubator-druid] pdeva commented on issue #8264: permanently deleting old segment from metadata should be part of datasource lifecycle

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pdeva commented on issue #8264: permanently deleting old segment from metadata should be part of datasource lifecycle
URL: https://github.com/apache/incubator-druid/issues/8264#issuecomment-519635068
 
 
   The documentation for `druid.coordinator.kill.on` is very confusing:
   
   ```
   Boolean flag for whether or not the Coordinator should 
   submit kill task for unused segments, that is, 
   hard delete them from metadata store and deep storage.
   ```
   
   What qualifies as `unused` segments?
   
   If i want to add a lifecyle rule to load say 90 days of data, and accidentally type 80 instead of 90, will coordinator have already deleted those extra 10 days permanently by then? 
   
   ```
   If set to true, then for all whitelisted dataSources (or optionally all), 
   Coordinator will submit tasks periodically based on period specified. 
   ```
   
   Where does one specify the said `period`? This is a boolean property
   
   ```
   These kill tasks will delete all segments except for the last durationToRetain period.
   ```
   
   What `durationToRetain` is this referring to?
   Also does it apply the same `duration` to all datasources? 
   How do i specify different durations for different datasources?
   
   
   

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