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Posted to notifications@skywalking.apache.org by GitBox <gi...@apache.org> on 2021/05/19 15:04:04 UTC

[GitHub] [skywalking] kezhenxu94 commented on pull request #6976: Fetch further data only when they're requested

kezhenxu94 commented on pull request #6976:
URL: https://github.com/apache/skywalking/pull/6976#issuecomment-844193184


   > Such as don't have `value` in metric query, but who uses in this way for the product env?
   
   This is not to map the requested fields to DB fields.
   
   For the example you gave, we STILL query all fields in metrics table and let the GraphQL determine which fields to return. The overhead is tiny.
   
   But for those queries that need multiple DB queries to compose a complex (and maybe large) result set (e.g. events in alarm), this becomes necessary. 
   
   Also, since WebApp and OAP are deployed separately and OAP doesn't usually have incompatible changes from the perspective of WebApp, users may use old web app that is not aware of events in alarm while new OAP still queries them.


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