Firstsawyou commented on issue #3999:
URL: https://github.com/apache/apisix/issues/3999#issuecomment-814723884


   The etcd cluster needs to enable `gRPC gateway`, you can refer to here to 
enable it.  
https://github.com/apache/apisix/blob/master/docs/en/latest/FAQ.md#why-there-are-a-lot-of-failed-to-fetch-data-from-etcd-failed-to-read-etcd-dir-etcd-key-xxxxxx-errors-in-errorlog


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