Todd Lipcon created HDFS-4486:
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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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