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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 Mon, 29 Nov 2010 18:35:17 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964870#action_12964870
] 

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

<quote>
Was this the feedback I gave on MAPREDUCE-1462 back in February? I haven't given any feedback
offline for this issue.
<quote>
I thought we went through the APIs offline after that.

<quote>
The original work for Thrift and Protocol Buffers serializations (MAPREDUCE-376 and MAPREDUCE-377)
was as contrib modules, so if we want to change that approach, then we need to get consensus
on doing so. 
<quote>

Neither of those was ever committed, but of course we need consensus to continue. 

<quote>
Serializations in this form are easy to use by the way: users just add the relevant contrib
jar and the serialization jar to the job, just like any other dependency.
<quote>

It is far more efficient to use the distributed cache to distribute the jars than bundling
them up into the user's jar that has to be downloaded each time.

> 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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