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https://issues.apache.org/jira/browse/MAPREDUCE-4049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526565#comment-13526565
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Alejandro Abdelnur commented on MAPREDUCE-4049:
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Arun, focusing on the technical side of your comments. My reasons to revert the
patch from trunk are:
All these components are highly interrelated as you know.
During the review of MAPREDUCE-4049 we found inconsistencies in the naming and
we aligned them with the other sub-tasks. We may need to do some more of that.
This was your motivation to create MAPREDUCE-2454 branch after a similar
comment I've made in MAPREDUCE-4809.
You want to have gridmix runs in a reasonable size cluster to ensure there are
not performance degradation due to the subtasks of MAPREDUCE-2454. I don' t see
why MAPREDUCE-4049 should be excluded from those tests. Personally I think this
is not needed for any of the patches as a change from 'new' to
'ReflectionUtils.newInstance()' outside of the processing loop cannot affect
things, but you strongly asked me for this over the phone.
Thus, I think your 'requirements' for the other tasks to MAPREDUCE-2454 do also
apply to MAPREDUCE-4049 and until they are satisfied, MAPREDUCE-2454 is not
ready for going to trunk.
Said this, again, please revert. I'm confident we can do a last push and get
the branch MAPREDUCE-2454 merge into trunk at fast pace.
> 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
> Assignee: Avner BenHanoch
> Labels: merge, plugin, rdma, shuffle
> Fix For: 3.0.0
>
> Attachments: HADOOP-1.x.y.patch, Hadoop Shuffle Plugin Design.rtf,
> mapreduce-4049.patch, mapreduce-4049.patch, 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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