hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1126) shuffle should use serialization to get comparator
Date Wed, 03 Feb 2010 20:59:28 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12829253#action_12829253
] 

Aaron Kimball commented on MAPREDUCE-1126:
------------------------------------------

Jay,

Right now Mappers are configured directly by the user, and the InputSplits are allocated by
the InputFormat. A system that combines the configuration two is intriguing, but would represent
a pretty big shift in API. I think this is something you might want to file as a separate
JIRA; this thread has enough ideas floating around on it already, and something like that
would require its own separate discussion.

- Aaron

> shuffle should use serialization to get comparator
> --------------------------------------------------
>
>                 Key: MAPREDUCE-1126
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1126
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: task
>            Reporter: Doug Cutting
>            Assignee: Aaron Kimball
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-1126.2.patch, MAPREDUCE-1126.3.patch, MAPREDUCE-1126.4.patch,
MAPREDUCE-1126.5.patch, MAPREDUCE-1126.6.patch, MAPREDUCE-1126.patch, MAPREDUCE-1126.patch
>
>
> Currently the key comparator is defined as a Java class.  Instead we should use the Serialization
API to create key comparators.  This would permit, e.g., Avro-based comparators to be used,
permitting efficient sorting of complex data types without having to write a RawComparator
in Java.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message