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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 05:35:19 UTC
[jira] [Updated] (SPARK-3750) Log ulimit settings at warning if
they are too low
[ https://issues.apache.org/jira/browse/SPARK-3750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon updated SPARK-3750:
--------------------------------
Labels: bulk-closed (was: )
> 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
> Labels: bulk-closed
>
> 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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