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https://issues.apache.org/jira/browse/MAPREDUCE-3246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13141039#comment-13141039
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Binglin Chang commented on MAPREDUCE-3246:
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The extra warnings are deprecation warnings and I can't make them disappear.
org/apache/hadoop/mapred/MapTask.java:[109,36] [deprecation]
org.apache.hadoop.mapred.JobConf in org.apache.hadoop.mapred has been deprecated
> Make Task extensible to support modifications of Task or even alternate
> programming paradigms
> ---------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-3246
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3246
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: task
> Affects Versions: 0.23.0
> Reporter: Binglin Chang
> Assignee: Binglin Chang
> Attachments: MAPREDUCE-3246-extensible-task.patch,
> MAPREDUCE-3246-extensible-task.v2.patch,
> MAPREDUCE-3246-extensible-task.v3.patch
>
>
> One of MRv2's goal is to support alternate programming paradigms, but
> building a application using YARN from the bottom is not trivial. In fact
> most component of MapReduce can be reused, mostly the scheduler/master side,
> and we can make changes/extensions only on the task/slave side, such as
> native tasks, hash-aggregation style combiner/reducer interfaces.
> The first thing to do I think is to make task/slave side extensible, more
> specific, the Task in JvmTask should serialized with class name, not simply a
> boolean isMap, and make task class name configurable in JobConf, there maybe
> other minor changes. By doing so, developers can at least extends their own
> MapTask/ReduceTask.
> I just post my initial thoughts here for opinions. If this change is OK, I
> can submit a patch, this is just a trivial work.
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