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https://issues.apache.org/jira/browse/SPARK-8008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14584777#comment-14584777
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Rene Treffer commented on SPARK-8008:
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Well, turns out I was wrong, union does not work as expected. I'm also running
into very strange problems on load.
I'm now doing a load on a per-day basis, storing it to parquet files which in
turn requires SPARK-4176 and the SPARK-7897 improvement that [~rxin] just
merged.
I'm simply using a folder structure that should work for loading (extra field
serialized in the path).
> 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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