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From "Liyin Tang (JIRA)" <>
Subject [jira] Resolved: (HIVE-1702) optimize JDBM to make mapjoin faster
Date Tue, 02 Nov 2010 02:17:25 GMT


Liyin Tang resolved HIVE-1702.

      Resolution: Won't Fix
    Release Note: JDBM will be removed from Hive

> optimize JDBM to make mapjoin faster
> ------------------------------------
>                 Key: HIVE-1702
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Liyin Tang
> Htree.get() cost 70% total time. It could help a lot if there is bloom filter here to
avoid unneeded get() if we know for sure the given key is not in JDBM. (we can generate the
bloom filter when doing the jdbm sink, and read into memory when doing read. )
> Copied from

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