[ https://issues.apache.org/jira/browse/HDFS-4486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhe Zhang updated HDFS-4486:
----------------------------
Status: Open (was: Patch Available)
> 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
> Attachments: HDFS-4486-20140820.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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