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https://issues.apache.org/jira/browse/HDFS-4453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron T. Myers resolved HDFS-4453.
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      Resolution: Fixed
    Hadoop Flags: Reviewed

I've just committed this to the HDFS-347 branch.

Thanks a lot for the contribution, Colin.
                
> Make a simple doc to describe the usage and design of the shortcircuit read 
> feature
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-4453
>                 URL: https://issues.apache.org/jira/browse/HDFS-4453
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, hdfs-client
>            Reporter: Brandon Li
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-4453.001.patch, HDFS-4453.002.patch, 
> HDFS-4453.003.patch, HDFS-4453.004.patch
>
>
> It would be nice to have a document to describe the configuration and design 
> of this feature. Also its relationship with previous short circuit read 
> implementation(HDFS-2246), for example, can they co-exist, or this one is 
> planed to replaces HDFS-2246, or it can fall back on HDFS-2246 when unix 
> domain socket is not supported.

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