Copilot commented on code in PR #11451:
URL: https://github.com/apache/ozone/pull/11451#discussion_r4225492426


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THREAT_MODEL.md:
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@@ -328,6 +337,7 @@ Per-boundary input trust (grouped by family):
   ideally, encrypt them on disk. *(maintainer — jojochuang, 2026-06-25.)*
 - **Isolate the KMS** in a separate, firewalled network segment. *(maintainer —
   jojochuang, 2026-06-25.)*
+- **Bound client load:** set namespace and space quotas, enable the RPC 
`FairCallQueue` on the OM (for S3 traffic it needs the Ozone identity 
provider), and put rate limiting in front of an internet-facing S3 Gateway. 
Ozone does not promise to withstand load by volume (§9).

Review Comment:
   The FairCallQueue recommendation omits that the default S3 Gateway-to-OM 
transport is gRPC (`ozone.om.s3.grpc.server_enabled=true`), while FairCallQueue 
has no gRPC implementation. Configuring only the identity provider therefore 
leaves default S3 traffic unprotected; explicitly require switching S3 Gateway 
to Hadoop RPC before enabling FairCallQueue (see 
`hadoop-hdds/docs/content/feature/FairCallQueue.md:21-28,44-63` and 
`hadoop-hdds/common/src/main/resources/ozone-default.xml:4502-4508`).



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