[jira] [Created] (HDFS-16881) Print a warning if AccessControlEnforcer runs for a long time to check permission

["Tsz-wo Sze (Jira)" <ji...@apache.org>]

Tsz-wo Sze created HDFS-16881:
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             Summary: Print a warning 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


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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