You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@crunch.apache.org by "Josh Wills (JIRA)" <ji...@apache.org> on 2014/07/06 04:17:34 UTC
[jira] [Updated] (CRUNCH-437) Fix Crunch Spark duplicate value
aggregation
[ https://issues.apache.org/jira/browse/CRUNCH-437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Josh Wills updated CRUNCH-437:
------------------------------
Attachment: CRUNCH-437.patch
Patch for the same.
> Fix Crunch Spark duplicate value aggregation
> --------------------------------------------
>
> Key: CRUNCH-437
> URL: https://issues.apache.org/jira/browse/CRUNCH-437
> Project: Crunch
> Issue Type: Bug
> Reporter: Josh Wills
> Attachments: CRUNCH-437.patch
>
>
> The current Crunch-on-Spark mapside combiner uses a Multimap of key-value pairs to cache values for local aggregation. This is awesome, except it means that identical key-value outputs before a shuffle will only have one copy in the Multimap, which means that the aggregation counts may not be correct. We should fix it to use a proper Map<K, List<V>> to ensure that duplicate values are aggregated correctly.
--
This message was sent by Atlassian JIRA
(v6.2#6252)