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https://issues.apache.org/jira/browse/HDFS-17580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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farmmamba resolved HDFS-17580.
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Resolution: Won't Fix
Only change to false can not prevent datanode hang.
We need some other methods.
> Change the default value of dfs.datanode.lock.fair to false due to potential
> hang
> ---------------------------------------------------------------------------------
>
> Key: HDFS-17580
> URL: https://issues.apache.org/jira/browse/HDFS-17580
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.4.0
> Reporter: farmmamba
> Assignee: farmmamba
> Priority: Major
> Labels: pull-request-available
>
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