[ https://issues.apache.org/jira/browse/HADOOP-12579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15259099#comment-15259099 ] 

Kai Zheng commented on HADOOP-12579:
------------------------------------

Ok, I agree, since we remain the enum values for other entries, just removing the obsolete entry. Will update it.

> Deprecate and remove WriteableRPCEngine
> ---------------------------------------
>
>                 Key: HADOOP-12579
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12579
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Haohui Mai
>         Attachments: HADOOP-12579-v1.patch, HADOOP-12579-v3.patch, HADOOP-12579-v4.patch, HADOOP-12579-v5.patch, HADOOP-12579-v6.patch, HADOOP-12579-v7.patch, HADOOP-12579-v8.patch
>
>
> The {{WriteableRPCEninge}} depends on Java's serialization mechanisms for RPC requests. Without proper checks, it has be shown that it can lead to security vulnerabilities such as remote code execution (e.g., COLLECTIONS-580, HADOOP-12577).
> The current implementation has migrated from {{WriteableRPCEngine}} to {{ProtobufRPCEngine}} now. This jira proposes to deprecate {{WriteableRPCEngine}} in branch-2 and to remove it in trunk.



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