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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