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https://issues.apache.org/jira/browse/HIVE-1641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liyin Tang updated HIVE-1641:
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Attachment: Hive-1641(3).txt
> add map joined table to distributed cache
> -----------------------------------------
>
> Key: HIVE-1641
> URL: https://issues.apache.org/jira/browse/HIVE-1641
> Project: Hadoop 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.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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