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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4486) Add log category for long-running DFSClient notices
Date Fri, 08 Feb 2013 21:57:12 GMT
Todd Lipcon created HDFS-4486:
---------------------------------

             Summary: 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
            Priority: Minor


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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