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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6165) Add metadata to Serializations
Date Thu, 13 Aug 2009 15:42:14 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tom White updated HADOOP-6165:
------------------------------

    Attachment: HADOOP-6165-v2.patch

This patch implements 1, and 3.i (for sequence files) above but not 3.ii, 3.iii, or 5. I've
changed the accept() method to just take the metadata map, and not the Class, following Doug's
suggestion.

For the 0.21 release it is only necessary to make the API changes to the serialization framework.
This means deprecating the Serialization/Serializer/Deserializer interfaces and introducing
Base{Serialization,Serializer,Deserializer} (1).

Changes to take full advantage of the new framework in MapReduce (3.ii, 3.iii) can be introduced
progressively in later JIRAs, since they will be additions and shouldn't affect backward compatibility.

> Add metadata to Serializations
> ------------------------------
>
>                 Key: HADOOP-6165
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6165
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: contrib/serialization
>            Reporter: Tom White
>            Priority: Blocker
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-6165-v2.patch, HADOOP-6165.patch
>
>
> The Serialization framework only allows a class to be passed as metadata. This assumes
there is a one-to-one mapping between types and Serializations, which is overly restrictive.
By permitting applications to pass arbitrary metadata to Serializations, they can get more
control over which Serialization is used, and would also allow, for example, one to pass an
Avro schema to an Avro Serialization.

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