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https://issues.apache.org/jira/browse/HADOOP-7753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413165#comment-13413165
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Cristina L. Abad commented on HADOOP-7753:
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Yes, I know that. The issue is that some people may be using the 32-bit 
libraries on 64-bit architectures. This actually works fine except if you turn 
on these features and you are running on a system with the bug I mentioned. 
Anyway, this is a minor problem, just thought it would be a good idea to 
mention it here in case someone runs into the problem and doesn't know what's 
going on.

                
> Support fadvise and sync_data_range in NativeIO, add ReadaheadPool class
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-7753
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7753
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: io, native, performance
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.23.0
>
>         Attachments: HADOOP-7753.branch-1.patch, HADOOP-7753.branch-1.patch, 
> hadoop-7753.txt, hadoop-7753.txt, hadoop-7753.txt, hadoop-7753.txt, 
> hadoop-7753.txt
>
>
> This JIRA adds JNI wrappers for sync_data_range and posix_fadvise. It also 
> implements a ReadaheadPool class for future use from HDFS and MapReduce.

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