[jira] Commented: (HADOOP-6685) Change the generic serialization framework API to use serialization-specific bytes instead of Map for configuration

["Doug Cutting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859550#action_12859550 ] 

Doug Cutting commented on HADOOP-6685:
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Different serializations currently use common keys to share parts of their configuration data.  For example, many name a class that implements the serialization.  Several name a class that represents the instances.  The code that accesses these properties is shared, either through a common base class or a utility class.

Binary blobs can also be considerably more fragile than a Map<String,String>.  If we wish the versions of clients and servers to be able to vary, then blobs stored in configurations must be version-tolerant, i.e., written and read with a fairly sophisticated serialization system.

> 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
>
> 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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