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https://issues.apache.org/jira/browse/SPARK-3750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-3750:
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Priority: Minor (was: Major)
Andrew do you still want to add this?
> Log ulimit settings at warning if they are too low
> --------------------------------------------------
>
> Key: SPARK-3750
> URL: https://issues.apache.org/jira/browse/SPARK-3750
> Project: Spark
> Issue Type: Improvement
> Components: Deploy
> Affects Versions: 1.1.0
> Reporter: Andrew Ash
> Priority: Minor
>
> In recent versions of Spark the shuffle implementation is much more
> aggressive about writing many files out to disk at once. Most linux kernels
> have a default limit in the number of open files per process, and Spark can
> exhaust this limit. The current hash-based shuffle implementation requires
> as many files as the product of the map and reduce partition counts in a wide
> dependency.
> In order to reduce the errors we're seeing on the user list, we should
> determine a value that is considered "too low" for normal operations and log
> a warning on executor startup when that value isn't met.
> 1. determine what ulimit is acceptable
> 2. log when that value isn't met
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