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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6685) Change the generic serialization framework API to use serialization-specific bytes instead of Map<String,String> for configuration
Date Fri, 19 Nov 2010 20:26:25 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933964#action_12933964
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Arun C Murthy commented on HADOOP-6685:
---------------------------------------

{quote}
I would be willing to entertain non-Map<String,String> representations of serialization
metadata, if:

    * it didn't create a core dependency on ProtocolBuffers
    * it didn't extend SequenceFile

I am -1 on this patch as-is.
{quote}

Doug, thanks for clarifying.


bq.     * it didn't extend SequenceFile

So, the patch, as it stands allows SequenceFiles to use the new serialization framework i.e.
adds a *feature*. Are you against this feature? Can you please explain why? 

Or, do you just prefer it as a separate patch?


> Change the generic serialization framework API to use serialization-specific bytes instead
of Map<String,String> for configuration
> ----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6685
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6685
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 0.22.0
>
>         Attachments: libthrift.jar, serial.patch, serial4.patch, serial6.patch, serial7.patch,
SerializationAtSummit.pdf
>
>
> Currently, the generic serialization framework uses Map<String,String> for the
serialization specific configuration. Since this data is really internal to the specific serialization,
I think we should change it to be an opaque binary blob. This will simplify the interface
for defining specific serializations for different contexts (MAPREDUCE-1462). It will also
move us toward having serialized objects for Mappers, Reducers, etc (MAPREDUCE-1183).

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