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https://issues.apache.org/jira/browse/HDFS-8778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14629611#comment-14629611
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Walter Su commented on HDFS-8778:
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TestStandbyIsHot failed again. I have filed HDFS-8772 to fix that. Please take
a look if you have time. Thanks.
> 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
> Fix For: 2.8.0
>
> 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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