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Posted to hdfs-dev@hadoop.apache.org by "Zhe Zhang (JIRA)" <ji...@apache.org> on 2016/05/25 04:54:12 UTC
[jira] [Created] (HDFS-10458) getFileEncryptionInfo should return
quickly for non-encrypted cluster
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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