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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4486) Add log category for long-running DFSClient notices
Date Wed, 27 Aug 2014 21:28:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14112885#comment-14112885
] 

Zhe Zhang commented on HDFS-4486:
---------------------------------

[~cmccabe] Thanks for the help!

> Add log category for long-running DFSClient notices
> ---------------------------------------------------
>
>                 Key: HDFS-4486
>                 URL: https://issues.apache.org/jira/browse/HDFS-4486
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Todd Lipcon
>            Assignee: Zhe Zhang
>            Priority: Minor
>             Fix For: 2.6.0
>
>         Attachments: HDFS-4486-20140820.patch, HDFS-4486-20140821.patch, HDFS-4486-20140822-2.patch,
HDFS-4486-20140822.patch, hdfs-4486-20140821-2.patch
>
>
> There are a number of features in the DFS client which are transparent but can make a
fairly big difference for performance -- two in particular are short circuit reads and native
checksumming. Because we don't want log spew for clients like "hadoop fs -cat" we currently
log only at DEBUG level when these features are disabled. This makes it difficult to troubleshoot/verify
for long-running perf-sensitive clients like HBase.
> One simple solution is to add a new log category - eg o.a.h.h.DFSClient.PerformanceAdvisory
- which long-running clients could enable at DEBUG level without getting the full debug spew.



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