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Posted to issues@hive.apache.org by "Wei Zheng (JIRA)" <ji...@apache.org> on 2015/09/24 20:18:04 UTC
[jira] [Updated] (HIVE-11306) Add a bloom-1 filter for Hybrid
MapJoin spills
[ https://issues.apache.org/jira/browse/HIVE-11306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wei Zheng updated HIVE-11306:
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Attachment: HIVE-11306.5.patch
Upload patch 5 for testing
> Add a bloom-1 filter for Hybrid MapJoin spills
> ----------------------------------------------
>
> Key: HIVE-11306
> URL: https://issues.apache.org/jira/browse/HIVE-11306
> Project: Hive
> Issue Type: Improvement
> Components: Hive
> Affects Versions: 1.3.0, 2.0.0
> Reporter: Gopal V
> Assignee: Wei Zheng
> Attachments: HIVE-11306.1.patch, HIVE-11306.2.patch, HIVE-11306.3.patch, HIVE-11306.5.patch
>
>
> HIVE-9277 implemented Spillable joins for Tez, which suffers from a corner-case performance issue when joining wide small tables against a narrow big table (like a user info table join events stream).
> The fact that the wide table is spilled causes extra IO, even though the nDV of the join key might be in the thousands.
> A cheap bloom-1 filter would add a massive performance gain for such queries, massively cutting down on the spill IO costs for the big-table spills.
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