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From "Owen O'Malley (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, 23 Nov 2010 00:06:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934666#action_12934666
] 

Owen O'Malley commented on HADOOP-6685:
---------------------------------------

{quote}
SequenceFile does not support indexes either. Indexes are provided by the MapFile API, etc.,
which are implemented as a pair of SequenceFiles. The same can be done with a pair of Avro
data files.
{quote}

It _could_ be, but hasn't been done. If the user doesn't want to implement their own, either
the OFile implementation from HADOOP-6684 or MapFile from this patch are the two choices.

{quote}
The declared topic of this issue is the representation of serialization metadata, not data
file formats.
{quote}

You vetoed the patch because it included changes to SequenceFile. Therefore the limitations
of the Avro file format are completely germane. 

> 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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