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https://issues.apache.org/jira/browse/SPARK-12817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15097418#comment-15097418
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Apache Spark commented on SPARK-12817:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/10748
> Simplify CacheManager code and remove unused BlockManager methods
> -----------------------------------------------------------------
>
> Key: SPARK-12817
> URL: https://issues.apache.org/jira/browse/SPARK-12817
> Project: Spark
> Issue Type: Improvement
> Components: Block Manager
> Reporter: Josh Rosen
> Assignee: Josh Rosen
>
> CacheManager directly calls MemoryStore.unrollSafely() and has its own logic
> for handling graceful fallback to disk when cached data does not fit in
> memory. However, this logic also exists inside of the MemoryStore itself, so
> this appears to be unnecessary duplication.
> We can remove this duplication and delete a significant amount of
> BlockManager code which existed only to support this CacheManager code.
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