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https://issues.apache.org/jira/browse/HADOOP-6949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12981484#action_12981484
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Konstantin Shvachko commented on HADOOP-6949:
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>From
>[comment|https://issues.apache.org/jira/browse/HDFS-1583?focusedCommentId=12981455&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12981455]
> move ObjectWritable's array i/o to protected methods, add a subclass with an
> optimized
> implementation of these methods, then use that subclass in RPC in place of
> ObjectWritable.
Sounds like a plan to me.
There is a patch for arrays with primitive types attached to this jira. Can be
used as a starting point I guess.
> 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
> Priority: Trivial
> Attachments: ObjectWritable.diff
>
> Original Estimate: 0.17h
> Remaining Estimate: 0.17h
>
> 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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