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https://issues.apache.org/jira/browse/HADOOP-18215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17809050#comment-17809050
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Shilun Fan commented on HADOOP-18215:
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3.3.6 release has been fixed, fix version removed 3.4.0
> Enhance WritableName to be able to return aliases for classes that use
> serializers
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-18215
> URL: https://issues.apache.org/jira/browse/HADOOP-18215
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Bryan Beaudreault
> Assignee: Bryan Beaudreault
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.3.6
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> WritableName allows users shim in aliases for writables, in the case where a
> SequenceFile was written with a Writable class that has since been renamed or
> moved to another package. However, this requires that the aliased class
> extend Writable.
> Separately it's possible to configure jobs with keys and values which don't
> actually extend Writable. Instead they are meant to be
> serialized/deserialized using the serialization classes defined in
> {{io.serializations}} config.
> Unfortunately, the current implementation does not support these key/value
> classes. All we need to do to support this is remove the
> {{.asSubclass(Writable.class)}} as is already the case for the default.
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