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https://issues.apache.org/jira/browse/HADOOP-6949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998486#comment-12998486
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Hairong Kuang commented on HADOOP-6949:
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Matt, for the version number. I believe that you just need to bump up the RPC 
version number: org.apache.hadoop.ipc.Server#CURRENT_VERSION. This should be 
good enough.

> Reduces RPC packet size for primitive arrays, especially long[], which is 
> used at block reporting
> -------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6949
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6949
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>            Reporter: Navis
>            Assignee: Matt Foley
>             Fix For: 0.23.0
>
>         Attachments: ObjectWritable.diff, arrayprim.patch, arrayprim_v4.patch
>
>   Original Estimate: 10m
>  Remaining Estimate: 10m
>
> Current implementation of oah.io.ObjectWritable marshals primitive array 
> types as general object array ; array type string + array length + (element 
> type string + value)*n
> It would not be needed to specify each element types for primitive arrays.

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