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https://issues.apache.org/jira/browse/HDFS-8971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15717023#comment-15717023
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ASF GitHub Bot commented on HDFS-8971:
--------------------------------------
Github user liuml07 commented on the issue:
https://github.com/apache/hadoop/pull/46
Can you create a JIRA on https://issues.apache.org/jira/browse/HDFS and
change the title of this PR to link the JIRA here? See
https://wiki.apache.org/hadoop/GithubIntegration for more information.
For the code, the DataNode logging has switched to slf4j. Please use
placeholders and guard statement like `if (LOG.isTraceEnabled())` is
unnecessary. Please refer to https://issues.apache.org/jira/browse/HDFS-8971
for examples.
> Remove guards when calling LOG.debug() and LOG.trace() in client package
> ------------------------------------------------------------------------
>
> Key: HDFS-8971
> URL: https://issues.apache.org/jira/browse/HDFS-8971
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: build
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Fix For: 2.8.0, 3.0.0-alpha1
>
> Attachments: HDFS-8971.000.patch, HDFS-8971.001.patch
>
>
> We moved the {{shortcircuit}} package from {{hadoop-hdfs}} to
> {{hadoop-hdfs-client}} module in JIRA
> [HDFS-8934|https://issues.apache.org/jira/browse/HDFS-8934] and
> [HDFS-8951|https://issues.apache.org/jira/browse/HDFS-8951], and
> {{BlockReader}} in
> [HDFS-8925|https://issues.apache.org/jira/browse/HDFS-8925]. Meanwhile, we
> also replaced the _log4j_ log with _slf4j_ logger. There were existing code
> in the client package to guard the log when calling {{LOG.debug()}} and
> {{LOG.trace()}}, e.g. in {{ShortCircuitCache.java}}, we have code like this:
> {code:title=Trace with guards|borderStyle=solid}
> 724 if (LOG.isTraceEnabled()) {
> 725 LOG.trace(this + ": found waitable for " + key);
> 726 }
> {code}
> In _slf4j_, this kind of guard is not necessary. We should clean the code by
> removing the guard from the client package.
> {code:title=Trace without guards|borderStyle=solid}
> 724 LOG.trace("{}: found waitable for {}", this, key);
> {code}
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