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https://issues.apache.org/jira/browse/FLINK-2194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14596523#comment-14596523
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ASF GitHub Bot commented on FLINK-2194:
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Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/814#issuecomment-114232368
The subtypes of `Writable` are still serialized using the special
`Writable` serializer. However, there are situations where you only have a
`Writable` type, e.g. for the Mahout DSL or if you have `DataSet` of
`LongWritable` and `TextWritable`.. Why should we not allow to use the
interface type then?
> Type extractor does not support Writable type
> ---------------------------------------------
>
> Key: FLINK-2194
> URL: https://issues.apache.org/jira/browse/FLINK-2194
> Project: Flink
> Issue Type: Bug
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
>
> The type extractor supports sub types of {{Writable}} but not {{Writable}}
> itself. The reason is that it wants to create a {{WritableTypeInfo}} which is
> not possible for the interface {{Writable}}, though. A solution would be to
> treat the {{Writable}} interface like a generic type.
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