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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-501) Object reuse issue in combineValues(Aggregator)
Date Mon, 23 Feb 2015 20:12:12 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14333745#comment-14333745
] 

Josh Wills commented on CRUNCH-501:
-----------------------------------

Ack, this one looks tricky. [~gabriel.reid], I could use some advice here: how do we inject
the PType so can we detach it inside of the Aggregator in a way that doesn't horribly break
backwards compatibility? Or should we do it in the CrunchCombiner/CrunchReducer in some way
instead?

> Object reuse issue in combineValues(Aggregator)
> -----------------------------------------------
>
>                 Key: CRUNCH-501
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-501
>             Project: Crunch
>          Issue Type: Bug
>            Reporter: Brandon Davis
>
> I'm trying to use combineValues on a PGroupedTable. I am using Aggregators.FIRST_N. If
I have 20 keys in my PGroupedTable, then I only get 20 distinct values because the AggregatorCombineFn
and FirstNAggregator don't detach the values from the incoming iterator.



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