crunch-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Stefan De Smit (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-286) ability to specify a different function for combiner & reducer
Date Sat, 26 Oct 2013 05:54:31 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13806010#comment-13806010
] 

Stefan De Smit commented on CRUNCH-286:
---------------------------------------

I also implemented the memory table by just skipping the combine phase, as there is indeed
no guarantee this is combining anything anyway.
As for the MultiPhaseCombineFn: that would of course also work. If you worry about the amount
of methods on PGroupedTable, this could be a way. But if that's not an issue, it makes the
functionality more hidden. So, it depends a bit on how exceptional you think this use case
is.

> ability to specify a different function for combiner & reducer
> --------------------------------------------------------------
>
>                 Key: CRUNCH-286
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-286
>             Project: Crunch
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Stefan De Smit
>            Assignee: Josh Wills
>            Priority: Minor
>         Attachments: 0001-add-combineValues-method-with-2-function-arguments.patch, 0002-.patch,
CRUNCH-286-prototype.patch
>
>
> Extend PGroupedTable with an extra combineValues function that accepts 2 functions: 1
for combiner phase, 1 for reducer phase.
> This way, different algorithm can be applied.



--
This message was sent by Atlassian JIRA
(v6.1#6144)

Mime
View raw message