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https://issues.apache.org/jira/browse/HDFS-15641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219713#comment-17219713
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Hongbing Wang commented on HDFS-15641:
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I have provided two alternative patch versions, [^HDFS-15641.002.patch] and
[^HDFS-15641.003.patch] . 003.patch just puts UT into
TestRefreshNamenodes.java.
> DataNode could meet deadlock if invoke refreshNameNode
> ------------------------------------------------------
>
> Key: HDFS-15641
> URL: https://issues.apache.org/jira/browse/HDFS-15641
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.2.0
> Reporter: Hongbing Wang
> Assignee: Hongbing Wang
> Priority: Critical
> Attachments: HDFS-15641.001.patch, HDFS-15641.002.patch,
> HDFS-15641.003.patch, deadlock.png, deadlock_fixed.png, jstack.log
>
>
> DataNode could meet deadlock when invoke `hdfs dfsadmin -refreshNamenodes
> hostname:50020` to register a new namespace in federation env.
> The jstack is shown in jstack.log
> The specific process is shown in Figure deadlock.png
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