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https://issues.apache.org/jira/browse/SPARK-3306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377416#comment-14377416
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Reynold Xin commented on SPARK-3306:
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Sorry I still don't get it. Can't you just use a global singleton object to
keep the connection pool?
> Addition of external resource dependency in executors
> -----------------------------------------------------
>
> Key: SPARK-3306
> URL: https://issues.apache.org/jira/browse/SPARK-3306
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Reporter: Yan
>
> Currently, Spark executors only support static and read-only external
> resources of side files and jar files. With emerging disparate data sources,
> there is a need to support more versatile external resources, such as
> connections to data sources, to facilitate efficient data accesses to the
> sources. For one, the JDBCRDD, with some modifications, could benefit from
> this feature by reusing established JDBC connections from the same Spark
> context before.
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