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Posted to common-issues@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2011/01/13 21:59:50 UTC

[jira] Reopened: (HADOOP-6949) Reduces RPC packet size for primitive arrays, especially long[], which is used at block reporting

     [ https://issues.apache.org/jira/browse/HADOOP-6949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Shvachko reopened HADOOP-6949:
-----------------------------------------


This seems to have higher impact on performance than previously reported. I see many VersionProtocol methods use arrays as their input or output parameters, which can substantially benefit from this optimization.
See discussion started in HDFS-1583.

> 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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