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https://issues.apache.org/jira/browse/HDFS-17626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17882703#comment-17882703
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ASF GitHub Bot commented on HDFS-17626:
---------------------------------------
tomscut opened a new pull request, #7053:
URL: https://github.com/apache/hadoop/pull/7053
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JIRA: HDFS-17626
### Description of PR
During the datanode startup process, there is a debug log, because there is
no LOG.isDebugEnabled() guard, so even if debug is not enabled, the read lock
will be obtained. The guard should be added here to reduce lock contention.
### How was this patch tested?
Not required
> Reduce lock contention at datanode startup
> ------------------------------------------
>
> Key: HDFS-17626
> URL: https://issues.apache.org/jira/browse/HDFS-17626
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Tao Li
> Assignee: Tao Li
> Priority: Minor
> Attachments: image-2024-09-18-20-45-56-999.png
>
>
> During the datanode startup process, there is a debug log, because there is
> no LOG.isDebugEnabled() guard, so even if debug is not enabled, the read lock
> will be obtained. The guard should be added here to reduce lock contention.
> !image-2024-09-18-20-45-56-999.png|width=333,height=263!
> !https://docs.corp.vipshop.com/uploader/f/4DSEukZKf6cV5VRY.png?accessToken=eyJhbGciOiJIUzI1NiIsImtpZCI6ImRlZmF1bHQiLCJ0eXAiOiJKV1QifQ.eyJleHAiOjE3MjY2NjQxNjYsImZpbGVHVUlEIjoiQWxvNE5uOU9OYko2aDJ4WCIsImlhdCI6MTcyNjY2MzU2NiwiaXNzIjoidXBsb2FkZXJfYWNjZXNzX3Jlc291cmNlIiwidXNlcklkIjo2MTYyMTQwfQ.DwDBnJ6I8vCFd14A-wsq2oLU5a0rcPoUvq49Z4aWg2A|width=334,height=133!
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