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https://issues.apache.org/jira/browse/SPARK-2255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-2255.
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Resolution: Won't Fix
I'm guessing this isn't going anywhere or is obsolete
> create a self destructing iterator that releases records from hash maps
> -----------------------------------------------------------------------
>
> Key: SPARK-2255
> URL: https://issues.apache.org/jira/browse/SPARK-2255
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Reynold Xin
>
> This is a small thing to do that can help out with GC pressure. For
> aggregations (and potentially joins), we don't really need to hold onto the
> key value pairs as soon as we have iterate over them. We can create a self
> destructing iterator for AppendOnlyMap / ExternalAppendOnlyMap that removes
> references to the key value pair as the iterator goes through records so
> those memory can be freed quickly.
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