Walter Su created HDFS-7978:
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Summary: Add LOG.isDebugEnabled() guard for some LOG.debug(..)
Key: HDFS-7978
URL: https://issues.apache.org/jira/browse/HDFS-7978
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Walter Su
{{isDebugEnabled()}} is optional. But when there are :
1. lots of concatenating Strings
2. complicated function calls
in the arguments, {{LOG.debug(..)}} should be guarded with
{{LOG.isDebugEnabled()}} to avoid unnecessary arguments evaluation and impove
performance.
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