[GitHub] [helix] pkuwm commented on issue #1232: Stoppable rest response is empty because of instance check exception

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

pkuwm commented on issue #1232:
URL: https://github.com/apache/helix/issues/1232#issuecomment-679288631


   Add formatted reason of instance check to API response so users have a clear idea of the reason if PERSIST_INTERMEDIATE_ASSIGNMENT is not turned on.
   ```
   curl -XPOST http://localhost:8100/admin/v2/namespaces/namespacce/clusters/cluster/instances\?command\=stoppable -d ' {"instances": ["instance"], "selection_base": "zone_based", "max_instance": "2", "customized_values": "{}"}' -H "Content-Type: application/json"
   {
     "instance_stoppable_parallel" : [ ],
     "instance_not_stoppable_with_reasons" : {
       "instance" : [ "HELIX:INVALID_CONFIG" ]
     }
   }
   ```
   Server log will have the reason logged: Cluster config PERSIST_INTERMEDIATE_ASSIGNMENT is not turned on, which is required for instance stability check.


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