[jira] [Commented] (IMPALA-7772) Print message when open file limit restricts size of file handle cache

["Philip Zeyliger (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMPALA-7772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16669428#comment-16669428 ] 

Philip Zeyliger commented on IMPALA-7772:
-----------------------------------------

It seems like Impala will open files (e.g., jars, log files, libraries, etc.) outside of the file handle cache, so we should reserve some number of the OS limit as well.

> Print message when open file limit restricts size of file handle cache
> ----------------------------------------------------------------------
>
>                 Key: IMPALA-7772
>                 URL: https://issues.apache.org/jira/browse/IMPALA-7772
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>    Affects Versions: Impala 3.1.0
>            Reporter: Joe McDonnell
>            Assignee: Joe McDonnell
>            Priority: Major
>
> The size of the file handle cache is determined by the min(max_cached_file_handles, OS limit on number of open files). Right now, there is no message printed if the OS limit on the number of open files is less than max_cached_file_handles. This is confusing, because the file handle cache will be smaller than expected. We should print a message on startup in this case.



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