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https://issues.apache.org/jira/browse/SPARK-1201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14031257#comment-14031257
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Mark Hamstra commented on SPARK-1201:
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What causes this to not be fixable within the scope of 1.0.1?
> Do not materialize partitions whenever possible in BlockManager
> ---------------------------------------------------------------
>
> Key: SPARK-1201
> URL: https://issues.apache.org/jira/browse/SPARK-1201
> Project: Spark
> Issue Type: New Feature
> Components: Block Manager, Spark Core
> Reporter: Patrick Wendell
> Assignee: Andrew Or
> Fix For: 1.1.0
>
>
> This is a slightly more complex version of SPARK-942 where we try to avoid
> unrolling iterators in other situations where it is possible. SPARK-942
> focused on the case where the DISK_ONLY storage level was used. There are
> other cases though, such as if data is stored serialized and in memory and
> but there is not enough memory left to store the RDD.
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