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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12172) Reduce EZ lookup overhead
Date Mon, 07 Aug 2017 03:12:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16116028#comment-16116028
] 

Xiao Chen commented on HDFS-12172:
----------------------------------

The failed tests and findbug warnings are not related to this jira.

Hi [~daryn],
Do you have cycles to review the slightly modified version of your patch? (Hope you don't
mind me updating it. :) )

> Reduce EZ lookup overhead
> -------------------------
>
>                 Key: HDFS-12172
>                 URL: https://issues.apache.org/jira/browse/HDFS-12172
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.7.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HDFS-12172.01.patch, HDFS-12172.patch
>
>
> A number of inefficiencies exist in EZ lookups.  These are amplified by frequent operations
like list status.  Once one encryption zone exists, all operations take the performance penalty.
> Ex. Operations should not perform redundant lookups.  EZ path reconstruction should be
lazy since it's not required in the common case.  Renames do not need to reallocate new IIPs
to check parent dirs for EZ.



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