[ https://issues.apache.org/jira/browse/HADOOP-2429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644797#action_12644797 ]

Chris Dyer commented on HADOOP-2429:

I think this seems like a very prudent suggestion, especially with respect to adding support for non-Java mappers and reducers that aren't forced to do everything with text. As for my understanding of what is typical at Google, serialization is handled in the mappers and reducers (often using protocol buffers, which incorporate a more efficient encoding for integers, etc.) and there are indeed many useful cases where complete deserialization is unnecessary and even where simple identity mapping/reducing is useful.

Is there any chance that this issue is going to be acted on? As someone who needs to do work in c++ (without linking in a JVM -- we have memory requirements as well), I've been hesitant to embrace Hadoop too fully since the restrictions that it imposes on non-Java code are substantial...
The lowest level map-reduce APIs should be byte oriented

Key: HADOOP-2429
URL: https://issues.apache.org/jira/browse/HADOOP-2429
Project: Hadoop Core
Issue Type: Improvement
Components: mapred
Reporter: eric baldeschwieler

As discussed here:
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.

Search Discussions

Discussion Posts

Follow ups

Related Discussions

Discussion Navigation
viewthread | post
posts ‹ prev | 1 of 2 | next ›
Discussion Overview
groupcommon-dev @
postedNov 3, '08 at 8:17p
activeNov 6, '08 at 6:02a

1 user in discussion

Owen O'Malley (JIRA): 2 posts



site design / logo © 2022 Grokbase