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https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932723#action_12932723
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Owen O'Malley commented on HADOOP-6685:
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{quote}
Indeed they aren't optional dependencies in the patch you have posted. But most
are not Hadoop dependencies at all before this patch.
{quote}
Avro is already a dependency. Thrift is already a dependency for HDFS (see
HDFS-1484). I'm only adding ProtocolBuffers, which is a commonly used
serialization format that many users including me find extremely useful.
{quote}
only introduce a serialization framework, not to add a number of
implementations of it,
{quote}
The implementations are relatively small and are required for showing that the
system actually works.
{quote}
nor I would add, to extend existing container file formats to incorporate new
serializations
{quote}
SequenceFile was updated to use the new io.serial interface. The other
containers had never been updated to use anything but Writable. Bringing them
up to the new interface was part of the work. Again, updating SequenceFile
shows that this code actually works. Without such a demonstration, this patch
would be incomplete.
> 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, 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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