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Posted to dev@hive.apache.org by "Chinna Rao Lalam (JIRA)" <ji...@apache.org> on 2014/10/31 05:45:34 UTC
[jira] [Assigned] (HIVE-8639) Convert SMBJoin to MapJoin [Spark
Branch]
[ https://issues.apache.org/jira/browse/HIVE-8639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chinna Rao Lalam reassigned HIVE-8639:
--------------------------------------
Assignee: Chinna Rao Lalam
> Convert SMBJoin to MapJoin [Spark Branch]
> -----------------------------------------
>
> Key: HIVE-8639
> URL: https://issues.apache.org/jira/browse/HIVE-8639
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Szehon Ho
> Assignee: Chinna Rao Lalam
>
> HIVE-8202 supports auto-conversion of SMB Join. However, if the tables are partitioned, there could be a slow down as each mapper would need to get a very small chunk of a partition which has a single key. Thus, in some scenarios it's beneficial to convert SMB join to map join.
> The task is to research and support the conversion from SMB join to map join for Spark execution engine. See the equivalent of MapReduce in SortMergeJoinResolver.
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