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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 Tue, 07 Dec 2010 01:57:18 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968539#action_12968539
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Allen Wittenauer commented on HADOOP-6685:
------------------------------------------

I think it is inevitable that Hadoop will need to provide support for multiple configuration
types and tying to just one (even internally) would be a huge mistake. For example, if we
were to support LDAP as a configuration service the configuration data on the user side would
be in x.500 format.  Converting that to JSON, YAML, or XML seems like a huge waste, especially
considering the verbosity of those representations. 

I think it is more than feasible to see where serialization-specific data might be binary.
 By forcing this data to be text, doesn't that mean any future data that is binary would need
to be base64 encoded or the like?



> 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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