Re: [I] Long running erlang map/reduce can block view compaction from completion, leaking erlang procs [couchdb]

["nickva (via GitHub)" <gi...@apache.org>]

nickva commented on issue #4725:
URL: https://github.com/apache/couchdb/issues/4725#issuecomment-1842062495

   * I'll second @rnewson's proposal to try a old-ddoc/new-ddoc strategy to deploy new views.
   
   * For clients could  use `stable=false&update=false` and let ken (index auto-builder) to build the indices for you in the background. Monitor with `_active_tasks`.
   
   * There is an undocumented `[smoosh.ignore] $shard = true` setting to allow the auto-compactor to ignore specific shards. For example:
   ```
   [smoosh.ignore]
   shards/e0000000-ffffffff/dbname.1660859921 = true
   ```
   
   * @fr2lancer if you're asking about debug logging for compaction/auto-compaction see issue https://github.com/apache/couchdb/issues/4815#issuecomment-1791518288. That's a bit tricky to set but it should work.
   
    * In your version of CouchDB 3.2.2 we had a bug calculating the slack and ratio and ended up triggering the auto-compactor too often. Consider upgrading to 3.3.3 if possible. You might find some of the compaction don't trigger as often any longer. That was fixed in 3.3.0 (https://github.com/apache/couchdb/pull/4264)
   


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