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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6165) Add metadata to Serializations
Date Fri, 14 Aug 2009 20:29:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743424#action_12743424

Doug Cutting commented on HADOOP-6165:

> I haven't added the fallback capability discussed, but it shouldn't be too hard to add.

Since AvroGenericSerialization is added last, the fallback could simply be to change its accept
method to accept anything that has AVRO_SCHEMA_KEY defined, no?

One other thing: we should probably adopt a naming convention for metadata keys.  Should they
be Java-package-like strings, e.g., org.apache.hadoop.io.serialization.class, or HTTP/SMTP
header-like things, e.g., Serialization-Class?

> 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
>            Assignee: Tom White
>            Priority: Blocker
>             Fix For: 0.21.0
>         Attachments: HADOOP-6165-v2.patch, HADOOP-6165-v3.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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