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https://issues.apache.org/jira/browse/SPARK-8008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14567219#comment-14567219
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Michael Armbrust commented on SPARK-8008:
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I'm okay adding documentation about this behavior where ever you think it would
help, but I would say this is "by design".
I'd suggest that if you want lower concurrency use fewer partitions to extract
the data and then {{repartition}} if you need higher concurrency for subsequent
operations.
> sqlContext.jdbc can kill your database due to high concurrency
> --------------------------------------------------------------
>
> Key: SPARK-8008
> URL: https://issues.apache.org/jira/browse/SPARK-8008
> Project: Spark
> Issue Type: Bug
> 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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