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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6685) Change the generic serialization framework API to use serialization-specific bytes instead of Map<String,String> for configuration
Date Thu, 18 Nov 2010 19:20:23 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated HADOOP-6685:
----------------------------------

    Hadoop Flags: [Incompatible change]

Feedback on v6:
* {{Text::readRawSting}} needs to reset {{newBytes}} on each iteration. It's not used in the
patch; if useful, unit tests for the new {{Text}} methods would probably be a good idea.
* Has this been tested by reading SequenceFiles and TFiles written before the patch? Tests
in MapReduce pass?
* The {{hadoop.serializations}} key should probably be added to core-default.xml and the _sigh_
{{CommonConfigurationKeysPublic}} class

Aside from these, the patch looks great.

> 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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