[
https://issues.apache.org/jira/browse/MAPREDUCE-326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830346#action_12830346
]
Tom White commented on MAPREDUCE-326:
-------------------------------------
There are some great ideas in this thread that I would love to see implemented,
but I'd like to focus on a few simple steps we can take to building a low-level
binary API.
In some sense we almost have a binary API tucked away in
Task/MapTask/ReduceTask - it's just not possible to get at for framework
developers. So we refactor the Task, MapTask, and ReduceTask classes to promote
their nested classes to top level-classes. This would be done in conjunction
with moving them to o.a.h.mapreduce.task and subpackages, and marking them
using the private annotation. Then we can clean up their interfaces to make
things more uniform (hiding the old and new APIs behind a common API). I think
we can do this work in stages, and it will improve the modularity of this area
of the codebase without sacrificing efficiency or compatibility.
Thoughts?
> The lowest level map-reduce APIs should be byte oriented
> --------------------------------------------------------
>
> Key: MAPREDUCE-326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-326
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: eric baldeschwieler
>
> As discussed here:
> https://issues.apache.org/jira/browse/HADOOP-1986#action_12551237
> The templates, serializers and other complexities that allow map-reduce to
> use arbitrary types complicate the design and lead to lots of object creates
> and other overhead that a byte oriented design would not suffer. I believe
> the lowest level implementation of hadoop map-reduce should have byte string
> oriented APIs (for keys and values). This API would be more performant,
> simpler and more easily cross language.
> The existing API could be maintained as a thin layer on top of the leaner API.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
