[GitHub] [druid] jihoonson opened a new issue #9677: segment/unavailable/count metric is misleading during handoff

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

jihoonson opened a new issue #9677: segment/unavailable/count metric is misleading during handoff
URL: https://github.com/apache/druid/issues/9677
 
 
   ### Affected Version
   
   The Druid version where the problem was encountered.
   
   ### Description
   
   The `segment/unavailable/count` metric is computed as the number of published segments that are not being served by historicals. But this is not the correct definition of "available": it should include realtime tasks as well. The effect is that the metric is misleading during handoff: it appears that unavailability spikes up before the new segments are loaded by historicals, even if all segments actually are continuously available on some combination of realtime tasks and historicals.
   
   See https://druid.apache.org/docs/latest/design/architecture.html#indexing-and-handoff for definitions of terms that we should be using here.

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