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https://issues.apache.org/jira/browse/HDFS-14651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17027943#comment-17027943
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Ahmed Hussein commented on HDFS-14651:
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Hi [~leosun08] and [~linyiqun]!
I am looking at the timeouts caused by the changes in this patch HDFS-15147
I have couple of questions:
# what is the usage of {{deadNodeDetectInterval}} ? As far as I understand,
every call to {{checkDeadNodes()}} will change the state to {{IDLE}} forcing
the {{DeadNodeDetector}} to sleep for {{IDLE_SLEEP_MS}}. So, why do we need
{{deadNodeDetectInterval}} if the actual time gap between every check is
{{IDLE_SLEEP_MS}}?
# Correct me if I am wrong:
{{stopDeadNodeDetectorThread.stopDeadNodeDetectorThread()}} is supposed to stop
the deadNodeDetector thread; but it looks like the implementation never of the
runnable never terminates. {{DeadNodeDetector}} surpresses all interrupts and
never checks for a termination flag. Therefore, the caller will just hang for 3
seconds waiting to join.
> DeadNodeDetector checks dead node periodically
> ----------------------------------------------
>
> Key: HDFS-14651
> URL: https://issues.apache.org/jira/browse/HDFS-14651
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Lisheng Sun
> Assignee: Lisheng Sun
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HDFS-14651.001.patch, HDFS-14651.002.patch,
> HDFS-14651.003.patch, HDFS-14651.004.patch, HDFS-14651.005.patch,
> HDFS-14651.006.patch, HDFS-14651.007.patch, HDFS-14651.008.patch
>
>
> DeadNodeDetector checks dead node periodically.
> DeadNodeDetector periodically detect the Node in DeadNodeDetector#deadnode,
> If the access is successful, the Node will be moved from
> DeadNodeDetector#deadnode. Continuous detection of the dead node is
> necessary. The DataNode need rejoin the cluster due to a service
> restart/machine repair. The DataNode may be permanently excluded if there is
> no added probe mechanism.
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