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From "Klaas Bosteels (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5979) Streaming partitioner should allow command, not just Java class
Date Wed, 10 Jun 2009 08:45:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717989#action_12717989
] 

Klaas Bosteels commented on HADOOP-5979:
----------------------------------------

Ok, so we should let the partitioner command determine the partition number directly then.

Further comments:
* Can we be sure that the number of partitions if always equal to the number of reducers under
all circumstances?
* The format of the data that gets written to and read from the partitioner command should,
of course, depend on the used {{InputWriter}} and {{OutputReader}} classes, but Milind's suggestion
sounds good for the text-based case.

> Streaming partitioner should allow command, not just Java class
> ---------------------------------------------------------------
>
>                 Key: HADOOP-5979
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5979
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: contrib/streaming
>            Reporter: Klaas Bosteels
>
> Since HADOOP-4842 got committed, Streaming allows both commands and Java classes to be
specified as mapper, reducer, and combiner, but the {{-partitioner}} option is still limited
to Java classes only. Allowing commands to be specified as partitioner as well would greatly
improve the flexibility of Streaming programs.

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