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https://issues.apache.org/jira/browse/SPARK-1888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-1888.
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Resolution: Duplicate
>From the end of the PR discussion, it looks like this was continued in
>SPARK-3000? The issue looks the same and the change looks like it touches the
>same files.
> enhance MEMORY_AND_DISK mode by dropping blocks in parallel
> -----------------------------------------------------------
>
> Key: SPARK-1888
> URL: https://issues.apache.org/jira/browse/SPARK-1888
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Wenchen Fan
> Assignee: Wenchen Fan
>
> Sometimes MEMORY_AND_DISK mode is slower than DISK_ONLY mode because of the
> lock on IO operations(dropping blocks in memory store). As the TODO says, the
> solution is: only synchronize the selecting of to-be-dropped blocks and do
> the dropping in parallel. I have a quick fix in my PR:
> https://github.com/apache/spark/pull/791#issuecomment-43567924
> It's fragile currently but I'm working on it to make it more robust.
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