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https://issues.apache.org/jira/browse/HDFS-5239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773646#comment-13773646
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Todd Lipcon commented on HDFS-5239:
-----------------------------------
+1
> Allow FSNamesystem lock fairness to be configurable
> ---------------------------------------------------
>
> Key: HDFS-5239
> URL: https://issues.apache.org/jira/browse/HDFS-5239
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 2.0.0-alpha, 3.0.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HDFS-5239.patch
>
>
> The fairness of the {{FSNamesystem#fsLock}} is hardcoded to {{true}}. Using
> an unfair lock provides a negligible increase to throughput. However this is
> due to bottlenecks elsewhere in the system. In combination with other
> changes, such as RPC layer and audit logging, preliminary tests show up to a
> 5X improvement for a read heavy workload.
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