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https://issues.apache.org/jira/browse/HADOOP-19864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18074065#comment-18074065
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ASF GitHub Bot commented on HADOOP-19864:
-----------------------------------------

steveloughran opened a new pull request, #8433:
URL: https://github.com/apache/hadoop/pull/8433

   
   ### Description of PR
   
   Purge WritableRPCEngine from the code.
   
   There's hints of its existence in the code (RpcWritable and ClientCache), 
but its not an RPC mechanism any more.
   
   ### How was this patch tested?
   
   tests of immediate methods; remaining homework is left to yetus
   
   ### For code changes:
   
   - [X] Does the title or this PR starts with the corresponding JIRA issue id 
(e.g. 'HADOOP-17799. Your PR title ...')?
   - [ ] Object storage: have the integration tests been executed and the 
endpoint declared according to the connector-specific documentation?
   - [ ] If adding new dependencies to the code, are these dependencies 
licensed in a way that is compatible for inclusion under [ASF 
2.0](http://www.apache.org/legal/resolved.html#category-a)?
   - [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`, 
`NOTICE-binary` files?
   
   ### AI Tooling
   
   If an AI tool was used:
   
   - [X] The PR includes the phrase "Contains content generated by <tool>"
         where <tool> is the name of the AI tool used.
   - [X] My use of AI contributions follows the ASF legal policy
         https://www.apache.org/legal/generative-tooling.html




> Cut WritableRPCEngine
> ---------------------
>
>                 Key: HADOOP-19864
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19864
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>    Affects Versions: 3.6.0
>            Reporter: Steve Loughran
>            Priority: Major
>
> Cut {{WritableRpcEngine}} from the code
> It's been obsolete for over a decade, with MAPREDUCE-6706 not needed 
> internally.
> Tez still uses it (TEZ-4708 ) so this removal will be incompatible for them. 



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