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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12825) Log slow name resolutions
Date Mon, 22 Feb 2016 10:41:18 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15156753#comment-15156753
] 

Steve Loughran commented on HADOOP-12825:
-----------------------------------------

Not with Guava stopwatch; that 's one of the classes that isn't forwards compatible. Use {{org.apache.hadoop.util.StopWatch}}

> Log slow name resolutions 
> --------------------------
>
>                 Key: HADOOP-12825
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12825
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Sidharta Seethana
>            Assignee: Sidharta Seethana
>         Attachments: HADOOP-12825.001.patch, getByName-call-graph.txt
>
>
> Logging slow name resolutions would be useful in identifying DNS performance issues in
a cluster. Most resolutions go through {{org.apache.hadoop.security.SecurityUtil.getByName}}
( see attached call graph ). Adding additional logging to this method would expose such issues.



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