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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10458) getFileEncryptionInfo should return quickly for non-encrypted cluster
Date Wed, 25 May 2016 04:54:12 GMT
Zhe Zhang created HDFS-10458:
--------------------------------

             Summary: getFileEncryptionInfo should return quickly for non-encrypted cluster
                 Key: HDFS-10458
                 URL: https://issues.apache.org/jira/browse/HDFS-10458
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.6.0
            Reporter: Zhe Zhang
            Assignee: Zhe Zhang


{{FSDirectory#getFileEncryptionInfo}} always acquires {{readLock}} and checks if the path
belongs to an EZ. For a busy system with potentially many listing operations, this could cause
locking contention.

I think we should add a call {{EncryptionZoneManager#hasEncryptionZone()}} to return whether
the system has any EZ. If no EZ at all, {{getFileEncryptionInfo}} should return null without
{{readLock}}.

If {{hasEncryptionZone}} is only used in the above scenario, maybe itself doesn't need a {{readLock}}
-- if the system doesn't have any EZ when {{getFileEncryptionInfo}} is called on a path, it
means the path cannot be encrypted.



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