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Posted to notifications@couchdb.apache.org by "nickva (via GitHub)" <gi...@apache.org> on 2023/03/03 22:58:36 UTC

[GitHub] [couchdb] nickva commented on issue #4451: Max request time in stats wrong or misunderstood

nickva commented on issue #4451:
URL: https://github.com/apache/couchdb/issues/4451#issuecomment-1454236489

   I have observed the oddness. I think it's because of how slide_uniform histograms are used for statistics 
   
   
   The update code seems to be in [couchdb-folsom](https://github.com/apache/couchdb-folsom/blob/67742acd21b561343ff9e3075f017201852a6424/src/folsom_sample_slide_uniform.erl#L42-L56)
   
   The initialization code is: https://github.com/apache/couchdb/blob/c0b8839bf28bd2c914d71a4dfafd3ea508c3040a/src/couch_stats/src/couch_stats.erl#L61-L62 where `DEFAULT_INTERVAL` is `10` (seconds)
   
   The histogram might work better with a constant stream of request and fails on rare, intermittent ones.


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