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https://issues.apache.org/jira/browse/HDFS-15641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219656#comment-17219656
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Hui Fei edited comment on HDFS-15641 at 10/23/20, 12:46 PM:
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[~wanghongbing] Sorry, i miss the changes of BPOfferService.java and run the
UT, so it passes.
{code:java}
1. lifelineSender.start();
2. bpThread.start();
{code}
If the order of execution is 1, then 2. *lifelineSender.start()* runs before
*bpThread.run()*, It will not have dead lock. But if the order of execution is
2, then 1. *bpThread.run()* and *lifelineSender.start()* could run
concurrently， and the it could have dead lock here. Is it right ?
Minor comments:
I found TestRefreshNamenodes.java, could you please move your UT there?
was (Author: ferhui):
[~wanghongbing] Sorry, i miss the changes of BPOfferService.java and run the
UT, so it passes.
* 1. lifelineSender.start();
* 2. bpThread.start();
If the order of execution is 1, then 2. *lifelineSender.start()* runs before
*bpThread.run()*, It will not have dead lock. But if the order of execution is
2, then 1. *bpThread.run()* and *lifelineSender.start()* could run
concurrently， and the it could have dead lock here. Is it right ?
Minor comments:
I found TestRefreshNamenodes.java, could you please move your UT there?
> 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,
> 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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