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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2014/05/21 21:09:37 UTC

[jira] [Updated] (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 ]

Reynold Xin updated SPARK-1888:
-------------------------------

    Assignee: Wenchen Fan

> 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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