hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ram Manohar Bheemana (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6423) MapOutput Sampler
Date Sat, 12 Sep 2015 20:08:46 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14742215#comment-14742215
] 

Ram Manohar Bheemana commented on MAPREDUCE-6423:
-------------------------------------------------

Sorry for delay in response, will try to generate the patch as suggested.

> MapOutput Sampler
> -----------------
>
>                 Key: MAPREDUCE-6423
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6423
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Ram Manohar Bheemana
>            Assignee: Ram Manohar Bheemana
>            Priority: Minor
>         Attachments: MapOutputSampler.java
>
>
> Need a sampler based on the MapOutput Keys. Current InputSampler implementation has a
major drawback which is input and output of a mapper should be same, generally this isn't
the case.
> approach:
> 1. Create a Sampler which samples the data based on the input.
> 2. Run a small map reduce in uber task mode using the original job mapper and identity
reducer to generate required MapOutputSample keys
> 3. Optionally, we can input the input file to be sample. For example inputs files A,
B; we should be able to specify to use only file A for sampling.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message