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Mariappan Asokan commented on MAPREDUCE-4049:
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Hi Avner,
You agree that {{ShuffleConsumerPlugin}} should be decoupled from merge. In
that case, it should have nothing to do with {{RawKeyValueIterator}}. However
in its current form the {{run()}} method in {{ShuffleConsumerPlugin}} returns
{{RawkKeyValueIterator}}. From a design point, my objection is that the
abstraction {{ShuffleConsumerPlugin}} is not capturing the concept it is
intended for namely moving just raw bytes from map hosts to reduce hosts and
nothing more.
I would ask you to go back to my original suggestion to make {{ShuffleRunner}}
pluggable. We can add an {{initialize()}} method there.
-- Asokan
> plugin for generic shuffle service
> ----------------------------------
>
> Key: MAPREDUCE-4049
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4049
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: performance, task, tasktracker
> Affects Versions: 1.0.3, 1.1.0, 2.0.0-alpha, 3.0.0
> Reporter: Avner BenHanoch
> Labels: merge, plugin, rdma, shuffle
> Attachments: HADOOP-1.x.y.patch, Hadoop Shuffle Consumer Plugin
> TLD.rtf, Hadoop Shuffle Provider Plugin TLD.rtf, mapred-site.xml,
> mapreduce-4049.patch, mapreduce-4049.patch
>
>
> Support generic shuffle service as set of two plugins: ShuffleProvider &
> ShuffleConsumer.
> This will satisfy the following needs:
> # Better shuffle and merge performance. For example: we are working on
> shuffle plugin that performs shuffle over RDMA in fast networks (10gE, 40gE,
> or Infiniband) instead of using the current HTTP shuffle. Based on the fast
> RDMA shuffle, the plugin can also utilize a suitable merge approach during
> the intermediate merges. Hence, getting much better performance.
> # Satisfy MAPREDUCE-3060 - generic shuffle service for avoiding hidden
> dependency of NodeManager with a specific version of mapreduce shuffle
> (currently targeted to 0.24.0).
> References:
> # Hadoop Acceleration through Network Levitated Merging, by Prof. Weikuan Yu
> from Auburn University with others,
> [http://pasl.eng.auburn.edu/pubs/sc11-netlev.pdf]
> # I am attaching 2 documents with suggested Top Level Design for both plugins
> (currently, based on 1.0 branch)
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