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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 Mon, 22 Nov 2010 18:59:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934557#action_12934557
] 

Doug Cutting commented on HADOOP-6685:
--------------------------------------

> There are no current replacements for its functionality and implicitly deprecating it
would be very expensive. Without the ability to extend SequenceFile to use the new generic
serialization api, users will have no way of using the new api for storing their data.

No user code will be broken if this patch is not committed.  You are free to create replacements
or extensions to SequenceFile in an external project.  I started doing that a year ago when
you vetoed initial efforts in this area.  This is a way we can all productively move forward.
 Hadoop need only provide APIs for data formats, mappers, reducers, etc., not implementations
of these.

> 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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