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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10939) Reduce performance penalty of encryption zones
Date Thu, 06 Oct 2016 14:07:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15552022#comment-15552022

Daryn Sharp commented on HDFS-10939:

Agreed, I wasn't very fond of the locking asymmetry.  Original implementation was similar
to your suggestion of relock in the finally but didn't like relocking/unlocking on failure.
You're right that errors should be a rare case.  Will update patch.

> Reduce performance penalty of encryption zones
> ----------------------------------------------
>                 Key: HDFS-10939
>                 URL: https://issues.apache.org/jira/browse/HDFS-10939
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs
>    Affects Versions: 2.7
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HDFS-10939.1.patch, HDFS-10939.patch
> The encryption zone APIs should be optimized to extensively use IIPs to eliminate path
resolutions.  The performance penalties incurred by common operations like creation of file
statuses may be reduced by more extensive short-circuiting of EZ lookups when no EZs exist.
 All file creates should not be subjected to the multi-stage locking performance penalty required
only for EDEK generation.

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