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From "He Yongqiang (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HIVE-1641) add map joined table to distributed cache
Date Tue, 26 Oct 2010 18:30:20 GMT

     [ https://issues.apache.org/jira/browse/HIVE-1641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

He Yongqiang resolved HIVE-1641.
--------------------------------

    Resolution: Fixed

I just committed! Thanks Liyin!

> add map joined table to distributed cache
> -----------------------------------------
>
>                 Key: HIVE-1641
>                 URL: https://issues.apache.org/jira/browse/HIVE-1641
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.7.0
>            Reporter: Namit Jain
>            Assignee: Liyin Tang
>             Fix For: 0.7.0
>
>         Attachments: Hive-1641(3).txt, Hive-1641(4).patch, Hive-1641(5).patch, Hive-1641.patch
>
>
> Currently, the mappers directly read the map-joined table from HDFS, which makes it difficult
to scale.
> We end up getting lots of timeouts once the number of mappers are beyond a few thousand,
due to 
> concurrent mappers.
> It would be good idea to put the mapped file into distributed cache and read from there
instead.

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