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https://issues.apache.org/jira/browse/HDFS-4538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615528#comment-13615528
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Colin Patrick McCabe commented on HDFS-4538:
--------------------------------------------

yes, I have tested the new code against the old server.  On a side note, we 
need to refresh the branch, because a lot of compatibility breaking PB changes 
have happened since the branch was created.
                
> allow use of legacy blockreader
> -------------------------------
>
>                 Key: HDFS-4538
>                 URL: https://issues.apache.org/jira/browse/HDFS-4538
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, hdfs-client, performance
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-4538.001.patch, HDFS-4538.002.patch, 
> HDFS-4538.003.patch, HDFS-4538.004.patch
>
>
> Some users might want to use the legacy block reader, because it is available 
> on Windows, whereas the secure solution has not yet been implemented there.  
> As described in the mailing list discussion, let's enable this.

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