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https://issues.apache.org/jira/browse/HDFS-4538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13619481#comment-13619481
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Suresh Srinivas commented on HDFS-4538:
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bq. No, the configuration parameters are not different. There is an additional 
parameter, dfs.client.use.legacy.blockreader.local, which can be set to true to 
use the legacy block reader.
I think we should start adding description of what a change is doing so that it 
is easy to understand the change being done without having to look at the patch.

What is the need for config parameter 
"dfs.client.use.legacy.blockreader.local"? 
                
> 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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