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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2014/12/11 21:39:13 UTC
[jira] [Resolved] (SPARK-1888) enhance MEMORY_AND_DISK mode by
dropping blocks in parallel
[ https://issues.apache.org/jira/browse/SPARK-1888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved SPARK-1888.
------------------------------
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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