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https://issues.apache.org/jira/browse/HBASE-7024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481663#comment-13481663
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stack commented on HBASE-7024:
------------------------------
Not that I know of. My guess is that it historical and long since addressed
over in Hadoop.
> TableMapReduceUtil.initTableMapperJob unnecessarily limits the types of
> outputKeyClass and outputValueClass
> -----------------------------------------------------------------------------------------------------------
>
> Key: HBASE-7024
> URL: https://issues.apache.org/jira/browse/HBASE-7024
> Project: HBase
> Issue Type: Bug
> Components: mapreduce
> Reporter: Dave Beech
> Priority: Minor
>
> The various initTableMapperJob methods in TableMapReduceUtil take
> outputKeyClass and outputValueClass parameters which need to extend
> WritableComparable and Writable respectively.
> Because of this, it is not convenient to use an alternative serialization
> like Avro. (I wanted to set these parameters to AvroKey and AvroValue).
> The methods in the MapReduce API to set map output key and value types do not
> impose this restriction, so is there a reason to do it here?
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