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https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934919#action_12934919
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Owen O'Malley commented on HADOOP-6685:
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I should have been clearer. The metadata is completely defined by the
serialization plugin. As such, it can choose to use JSON, XML, or an arbitrary
binary format. Any of them would work.
For the plugins that I wrote, I considered and rejected JSON. The reasons were:
* JSON would require me to write a parser and dumper.
* JSON would be less efficient in time and space.
I don't see any reason to use a less efficient solution, but others are welcome
to implement serialization plugins that represent the metadata as they wish.
> 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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