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https://issues.apache.org/jira/browse/HDFS-15789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17273917#comment-17273917
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Jim Brennan commented on HDFS-15789:
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The unit test failures are not related. I verified they pass for me locally.
> Lease renewal does not require namesystem lock
> ----------------------------------------------
>
> Key: HDFS-15789
> URL: https://issues.apache.org/jira/browse/HDFS-15789
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.4.0
> Reporter: Jim Brennan
> Assignee: Jim Brennan
> Priority: Major
> Attachments: HDFS-15789.001.patch
>
>
> [~daryn] found this while testing the performance for HDFS-15704.
> The lease manager is independent of the namesystem. Acquiring the lock causes
> unnecessary lock contention that degrades throughput.
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