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From "Doug Cutting (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 Tue, 16 Nov 2010 21:38:18 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932662#action_12932662
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Doug Cutting commented on HADOOP-6685:
--------------------------------------

Owen> they aren't optional dependences.

Indeed they aren't optional dependencies in the patch you have posted.  But most are not Hadoop
dependencies at all before this patch.   Tom seems to be suggesting that this patch could
be reduced to only introduce a serialization framework, not to add a number of implementations
of it, nor I would add, to extend existing container file formats to incorporate new serializations.
 That would bring the patch more in line with the description of this issue.  Perhaps the
serialization implementations and the extension of the containers could be moved to different
issues and this issue could focus on the serialization API itself?


> 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, 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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