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https://issues.apache.org/jira/browse/MAPREDUCE-4049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13259057#comment-13259057
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Avner BenHanoch commented on MAPREDUCE-4049:
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Hi Mariappan, thanks for your thorough comments.
It will take me time to provide you full answer (hopefully by the end of next
week). Hence, I'll start with something short and complete it later:
1. In some cases it make sense to use consumer & provider plugins as pair (for
example, I want the Shuffle to be over RDMA instead of HTTP; hence, I must
provide both sides). However, it is not mandatory. The interface (and
configuration) allow any combinations of plugins, including one from 3rd party
and one from vanilla (the default).
2&3. It could be that you are right. At this phase I am not 100% sure about
that (please allow me additional time). My merge doesn't work on shuffled
segments, but on streamed of segments during streaming (perhaps it is described
in the technical paper). Hence, I need to check deeper.
I hope to give you complete answer by the end of next week.
> 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
> Reporter: Avner BenHanoch
> Labels: merge, plugin, rdma, shuffle
> Attachments: HADOOP-1.0.2.patch, HADOOP-1.0.x.patch,
> HADOOP-1.0.x.patch, Hadoop Shuffle Consumer Plugin TLD.rtf, Hadoop Shuffle
> Provider Plugin TLD.rtf, MAPREDUCE-4049-branch-1.0.2.patch, mapred-site.xml,
> mapred.diff, src.tgz, test.diff
>
>
> 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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