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https://issues.apache.org/jira/browse/MAPREDUCE-4049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13505252#comment-13505252
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Arun C Murthy commented on MAPREDUCE-4049:
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Sorry, just caught up on this since I'm dealing with some health issues at home.
Frankly, worrying about whose work is a subset of whose is a pointless
exercise. Having said that, making related tasks sub-tasks makes sense as long
as there is a coherent community (one or more developers) working together
makes sense, I don't see it for MAPREDUCE-4049 vis-a-vis MAPREDUCE-2454.
IAC, there is no need to debate this further - it's just a time sink.
Finally, MAPREDUCE-2454 is a bunch of large-scale changes. I'm happy to commit
this as long as it's ready to, without tying it in.
----
Overall, I really don't like to see us egregiously rename core MR classes - at
best it's pointless for private apis, and at worst it hammers svn log. So, pls
do not change existing Shuffle etc.
Avner, please upload a patch with other changes:
# Use @LimitedPrivate, that way it makes it clear that this is for implementers
and not end-users.
# I'm ok with suggested config names (again, I'm not religious about naming).
With that it's good to go.
> plugin for generic shuffle service
> ----------------------------------
>
> Key: MAPREDUCE-4049
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4049
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> 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
> Fix For: trunk
>
> Attachments: HADOOP-1.x.y.patch, Hadoop Shuffle Plugin Design.rtf,
> mapreduce-4049.patch, mapreduce-4049.patch, 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)
> # I am providing link for downloading UDA - Mellanox's open source plugin
> that implements generic shuffle service using RDMA and levitated merge.
> Note: At this phase, the code is in C++ through JNI and you should consider
> it as beta only. Still, it can serve anyone that wants to implement or
> contribute to levitated merge. (Please be advised that levitated merge is
> mostly suit in very fast networks) -
> [http://www.mellanox.com/content/pages.php?pg=products_dyn&product_family=144&menu_section=69]
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