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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2015/07/20 02:42:04 UTC

[jira] [Commented] (SPARK-8008) JDBC data source can overload the external database system due to high concurrency

    [ https://issues.apache.org/jira/browse/SPARK-8008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14633004#comment-14633004 ] 

Reynold Xin commented on SPARK-8008:
------------------------------------

[~rtreffer] I'm going to close this one for now because I don't know if there is any feasible things we can do in the short-term. If we come up with a solution, we can reopen the ticket.


> JDBC data source can overload the external database system due to high concurrency
> ----------------------------------------------------------------------------------
>
>                 Key: SPARK-8008
>                 URL: https://issues.apache.org/jira/browse/SPARK-8008
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Rene Treffer
>
> Spark tries to load as many partitions as possible in parallel, which can in turn overload the database although it would be possible to load all partitions given a lower concurrency.
> It would be nice to either limit the maximum concurrency or to at least warn about this behavior.



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