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https://issues.apache.org/jira/browse/HDFS-16881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz-wo Sze updated HDFS-16881:
------------------------------
    Summary: Warn if AccessControlEnforcer runs for a long time to check 
permission  (was: Print a warning if AccessControlEnforcer runs for a long time 
to check permission)

> Warn if AccessControlEnforcer runs for a long time to check permission
> ----------------------------------------------------------------------
>
>                 Key: HDFS-16881
>                 URL: https://issues.apache.org/jira/browse/HDFS-16881
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namanode
>            Reporter: Tsz-wo Sze
>            Assignee: Tsz-wo Sze
>            Priority: Major
>
> AccessControlEnforcer is configurable.  If an external AccessControlEnforcer 
> runs for a long time to check permission with the FSnamesystem lock, it will 
> significantly slow down the entire Namenode.  In the JIRA, we will print a 
> WARN message when it happens.



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