mgao0 edited a comment on pull request #1302:
URL: https://github.com/apache/helix/pull/1302#issuecomment-679379516


   > From the description of #1296, I still don't quite understand what caused 
the issue.
   > 
   > So a finalize() from callback handler causing the routingTableProvider to 
reset and later update see empty snapshot.
   > 
   > So what caused the finalize? which path?
   
   When we dropped a customized state type (TYPE_C for example), the associated 
customized view path and its children nodes for this customized state type is 
deleted, so the callback handler is finalized. An example for the path would 
be: /cluster_name/CUSTOMIZEDVIEW/TYPE_C, 
/cluster_name/CUSTOMIZEDVIEW/TYPE_C/resource_name


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