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https://issues.apache.org/jira/browse/SPARK-4483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-4483.
-------------------------------------
Resolution: Fixed
Fix Version/s: 1.3.0
Issue resolved by pull request 3375
[https://github.com/apache/spark/pull/3375]
> Optimization about reduce memory costs during the HashOuterJoin
> ---------------------------------------------------------------
>
> Key: SPARK-4483
> URL: https://issues.apache.org/jira/browse/SPARK-4483
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.1.0
> Reporter: Yi Tian
> Priority: Minor
> Fix For: 1.3.0
>
>
> In {{HashOuterJoin.scala}}, spark read data from both side of join operation
> before zip them together. It is a waste for memory. We are trying to read
> data from only one side, put them into hashmap, and then generate the
> {{JoinedRow}} with data from other side one by one.
> Currently, we could only do this optimization for {{left outer join}} and
> {{right outer join}}. For {{full outer join}}, we will do somthing in
> another issue.
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