[jira] [Updated] (SPARK-3750) Log ulimit settings at warning if they are too low

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-3750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen updated SPARK-3750:
-----------------------------
    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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