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From "Allen Wittenauer (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 Sun, 12 Dec 2010 20:00:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12970637#action_12970637
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Allen Wittenauer commented on HADOOP-6685:
------------------------------------------

> You should be able to do that. Support for binary and other typed configuration values
would be great to have. I do not disagree with that. What I'd like to not lose is a generic
way to access configuration values. A standard configuration data model would permit that.

So Doug, if I read this (and other things you've posted) correctly, what you are actually
saying is that value actually should be typed binary to enable more flexibility. But your
real concern is that the configuration key is also typed binary because you feel that would
break the currently public "text-only" based interfaces (-D and hand-editing XML files) in
incompatible ways.  Correct?



> 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: serial.patch, serial4.patch, serial6.patch, serial7.patch, serial9.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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