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https://issues.apache.org/jira/browse/HDFS-8778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14628703#comment-14628703
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Andrew Wang commented on HDFS-8778:
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LGTM +1, thanks Arpit for finding and fixing. Test failure looks unrelated.
> TestBlockReportRateLimiting#testLeaseExpiration can deadlock
> ------------------------------------------------------------
>
> Key: HDFS-8778
> URL: https://issues.apache.org/jira/browse/HDFS-8778
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 2.7.1
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Attachments: HDFS-8778.01.patch, HDFS-8778.02.patch
>
>
> {{requestBlockReportLease}} blocks on DataNode registration while holding the
> NameSystem read lock.
> DataNode registration can block on the NameSystem read lock if a writer gets
> in the queue.
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