hadoop-common-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12858) Reduce UGI getGroups overhead
Date Tue, 01 Mar 2016 21:00:19 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15174398#comment-15174398
] 

Mingliang Liu commented on HADOOP-12858:
----------------------------------------

Thanks for the patch, [~daryn]. The fix looks good to me (non-binding). Specially, I double
checked that it's not breaking compatibility.

One comment is that, in modules other than {{hadoop-common}}, we may need to update {{getGroups}}
accordingly, e.g. in HDFS {{DataNode#checkSuperuserPrivilege()}} method. Is this tracked in
your other "performance patches"?

> Reduce UGI getGroups overhead
> -----------------------------
>
>                 Key: HADOOP-12858
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12858
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: performance
>    Affects Versions: 2.0.0-alpha
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HADOOP-12858.patch, HADOOP-12858.patch
>
>
> Group lookup generates excessive garbage with multiple conversions between collections
and arrays.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message