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From "Chris Douglas (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, 29 Nov 2010 22:00:24 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964962#action_12964962
] 

Chris Douglas commented on HADOOP-6685:
---------------------------------------

Doug> I'll try to be clearer. As I understand the veto, you and Tom object to three points:
# Format of the serialized metadata, specifically you both prefer JSON/stringly-typed data
to protocol buffers
# Packaging, in particular adding protocol buffers and thrift
# Changing SequenceFile, an experimental format packaged with Hadoop

I'm suggesting that this issue focus on (1) exclusively. If we reach consensus on this point,
then we can commit a patch and address (2) and (3) elsewhere. There is agreement on the domain
of (1), so a technical debate may follow. In contrast, (2) and (3) can be deferred, as (2)
is part of a larger failing and (3) can be addressed after the patch is committed. While (1)
admits coherent arguments, (2-3) have been fought by indignation. As a tactic for consensus,
it seems reasonable to stop arguing project policy proxied through this patch and focus on
the item admitting technical, falsifiable claims.

> 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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