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https://issues.apache.org/jira/browse/HDFS-17908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18074963#comment-18074963
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Steve Loughran commented on HDFS-17908:
---------------------------------------

github copilot was happy to do this BTW...best left to an hdfs engineer to set 
it loose

> remove "legacy" blocknode protocol, leaving only protobuf
> ---------------------------------------------------------
>
>                 Key: HDFS-17908
>                 URL: https://issues.apache.org/jira/browse/HDFS-17908
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, namenode
>    Affects Versions: 3.5.0
>            Reporter: Steve Loughran
>            Priority: Major
>
> Discovered while debugging test failures in HADOOP-19864
> Block token support still has "useProtobuf" as a boolean; support for 
> pre-protobuf era tokens is still there. Time to cut it. It may have been good 
> during a cluster upgrade, but everyone who plans to upgrade will have done so 
> by now.



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