Zhe Zhang created HDFS-10458:
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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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